diff --git a/backend/.env.example b/backend/.env.example
index 44f4bbc6..826205df 100644
--- a/backend/.env.example
+++ b/backend/.env.example
@@ -43,6 +43,11 @@ GITHUB_TOKEN=github_pat_your_token_here
 EMAIL_SERVICE=gmail
 
 # Gmail: use an App Password (Google Account → Security → 2-Step Verification → App Passwords)
+
+# Google Calendar OAuth (optional; enables interview prep calendar sync)
+# GOOGLE_CLIENT_ID=your-google-client-id
+# GOOGLE_CLIENT_SECRET=your-google-client-secret
+# GOOGLE_REDIRECT_URI=http://localhost:8000/api/google-calendar/callback
 # Ethereal: use credentials from https://ethereal.email
 EMAIL_USER=your_email@gmail.com
 EMAIL_PASS=xxxx xxxx xxxx xxxx
diff --git a/backend/config/validateEnv.js b/backend/config/validateEnv.js
index 03adf692..c92952dc 100644
--- a/backend/config/validateEnv.js
+++ b/backend/config/validateEnv.js
@@ -10,6 +10,10 @@ const optionalEnvGroups = Object.freeze([
     feature: "Jobs for You",
     keys: ["ADZUNA_APP_ID", "ADZUNA_API_KEY"],
   },
+  {
+    feature: "Google Calendar integration",
+    keys: ["GOOGLE_CLIENT_ID", "GOOGLE_CLIENT_SECRET", "GOOGLE_REDIRECT_URI"],
+  },
 ]);
 
 const validateEnv = () => {
diff --git a/backend/controllers/googleCalendarController.js b/backend/controllers/googleCalendarController.js
new file mode 100644
index 00000000..21a73232
--- /dev/null
+++ b/backend/controllers/googleCalendarController.js
@@ -0,0 +1,99 @@
+const User = require("../models/User");
+const {
+  getGoogleCalendarAuthUrl,
+  exchangeGoogleCalendarCode,
+  createOrUpdateGoogleCalendarEvent,
+  getGoogleCalendarConnectionStatus,
+  encryptSecret,
+} = require("../services/googleCalendarService.js");
+
+const connectGoogleCalendar = async (req, res) => {
+  try {
+    const { authUrl } = getGoogleCalendarAuthUrl(req.user?._id?.toString() || "anonymous");
+    return res.status(200).json({ success: true, authUrl });
+  } catch (error) {
+    console.error("Google Calendar connect error:", error.message);
+    return res.status(500).json({ success: false, message: error.message || "Unable to connect Google Calendar" });
+  }
+};
+
+const handleGoogleCalendarCallback = async (req, res) => {
+  try {
+    const { code, state, error } = req.query;
+
+    if (error) {
+      return res.status(400).json({ success: false, message: "Google authorization failed" });
+    }
+
+    if (!code || !state) {
+      return res.status(400).json({ success: false, message: "Invalid Google callback payload" });
+    }
+
+    const [userId] = state.split(":");
+    const tokens = await exchangeGoogleCalendarCode(code);
+
+    const user = await User.findById(userId);
+    if (!user) {
+      return res.status(404).json({ success: false, message: "User not found" });
+    }
+
+    user.googleCalendarConnected = true;
+    user.googleCalendarEmail = user.email;
+    user.googleCalendarConnectedAt = new Date();
+    user.googleCalendarAccessToken = encryptSecret(tokens.accessToken);
+    user.googleCalendarRefreshToken = encryptSecret(tokens.refreshToken);
+    user.googleCalendarTokenExpiry = tokens.expiryDate ? new Date(tokens.expiryDate) : null;
+    await user.save();
+
+    return res.status(200).json({ success: true, message: "Google Calendar connected successfully" });
+  } catch (error) {
+    console.error("Google Calendar callback error:", error.message);
+    return res.status(500).json({ success: false, message: error.message || "Unable to complete Google Calendar connection" });
+  }
+};
+
+const getGoogleCalendarStatus = async (req, res) => {
+  try {
+    const status = await getGoogleCalendarConnectionStatus(req.user);
+    return res.status(200).json({ success: true, ...status });
+  } catch (error) {
+    console.error("Google Calendar status error:", error.message);
+    return res.status(500).json({ success: false, message: error.message || "Unable to fetch Google Calendar status" });
+  }
+};
+
+const syncGoogleCalendarEvent = async (req, res) => {
+  try {
+    const { title, description, startTime, endTime, reminderMinutes, eventId } = req.body || {};
+
+    if (!title || !startTime || !endTime) {
+      return res.status(400).json({ success: false, message: "title, startTime, and endTime are required" });
+    }
+
+    const result = await createOrUpdateGoogleCalendarEvent(req.user, {
+      title,
+      description,
+      startTime,
+      endTime,
+      reminderMinutes,
+      eventId,
+    });
+
+    await User.findByIdAndUpdate(req.user._id, {
+      googleCalendarLastSyncedAt: new Date(),
+    });
+
+    return res.status(200).json({ success: true, event: result });
+  } catch (error) {
+    console.error("Google Calendar sync error:", error.message);
+    const statusCode = error.message === "expired" ? 401 : 500;
+    return res.status(statusCode).json({ success: false, message: error.message === "expired" ? "Google OAuth token has expired. Please reconnect Google Calendar." : error.message || "Unable to sync Google Calendar event" });
+  }
+};
+
+module.exports = {
+  connectGoogleCalendar,
+  handleGoogleCalendarCallback,
+  getGoogleCalendarStatus,
+  syncGoogleCalendarEvent,
+};
diff --git a/backend/controllers/sessionController.js b/backend/controllers/sessionController.js
index 4da73ca6..16d80475 100644
--- a/backend/controllers/sessionController.js
+++ b/backend/controllers/sessionController.js
@@ -1,7 +1,8 @@
 const Session = require("../models/Session");
 const Question = require("../models/Question");
+const User = require("../models/User");
 const mongoose = require("mongoose");
-
+const { getInterviewStreakUpdate } = require("../utils/interviewStreak");
 
 const MAX_SESSIONS = Number(process.env.MAX_SESSIONS) || 50;
 const MAX_EXPERIENCE = 50;
@@ -92,9 +93,38 @@ await createdSession[0].save({
   session: mongoSession,
 });
 
+            const user = await User.findById(userId).session(mongoSession);
+            if (!user) {
+                throw new Error("USER_NOT_FOUND");
+            }
+
+            const practiceDate = new Date().toISOString().split("T")[0];
+            const streakUpdate = getInterviewStreakUpdate(
+                {
+                    interviewStreak: Number(user.interviewStreak || 0),
+                    longestInterviewStreak: Number(user.longestInterviewStreak || 0),
+                    interviewStreakBadges: Array.isArray(user.interviewStreakBadges) ? user.interviewStreakBadges : [],
+                    interviewStreakLastPracticeDate: user.interviewStreakLastPracticeDate,
+                },
+                practiceDate
+            );
+
+            if (streakUpdate.changed) {
+                user.interviewStreak = Math.max(0, streakUpdate.streak);
+                user.longestInterviewStreak = Math.max(0, streakUpdate.longestStreak);
+                user.interviewStreakBadges = streakUpdate.badges;
+                user.interviewStreakLastPracticeDate = practiceDate;
+                await user.save({ session: mongoSession });
+            }
+
             res.status(201).json({
                 success: true,
                 session: createdSession[0],
+                streakSummary: {
+                    current: user.interviewStreak,
+                    longest: user.longestInterviewStreak,
+                    badges: user.interviewStreakBadges,
+                },
             });
         });
     } catch (err) {
@@ -105,6 +135,13 @@ await createdSession[0].save({
             });
         }
 
+        if (err.message === "USER_NOT_FOUND") {
+            return res.status(404).json({
+                success: false,
+                message: "User not found.",
+            });
+        }
+
         console.error("Create session error:", err);
         return res.status(500).json({
             success: false,
diff --git a/backend/models/User.js b/backend/models/User.js
index 5d0d6b3c..0512f657 100644
--- a/backend/models/User.js
+++ b/backend/models/User.js
@@ -53,6 +53,18 @@ const UserSchema = new mongoose.Schema(
         },
         
         unlockedAchievements: { type: [String], default: [] },
+        interviewStreak: { type: Number, default: 0, min: 0 },
+        longestInterviewStreak: { type: Number, default: 0, min: 0 },
+        interviewStreakBadges: { type: [String], default: [] },
+        interviewStreakLastPracticeDate: { type: String, default: null },
+
+        googleCalendarConnected: { type: Boolean, default: false },
+        googleCalendarEmail: { type: String, default: null },
+        googleCalendarConnectedAt: { type: Date, default: null },
+        googleCalendarAccessToken: { type: String, default: null },
+        googleCalendarRefreshToken: { type: String, default: null },
+        googleCalendarTokenExpiry: { type: Date, default: null },
+        googleCalendarLastSyncedAt: { type: Date, default: null },
 
         //Email Verification
         isEmailVerified: { type: Boolean, default: false },
@@ -90,6 +102,8 @@ UserSchema.set("toJSON", {
     delete ret.emailVerificationToken;
     delete ret.emailVerificationExpires;
     delete ret.tokenVersion;
+    delete ret.googleCalendarAccessToken;
+    delete ret.googleCalendarRefreshToken;
     return ret;
   },
 });
diff --git a/backend/package-lock.json b/backend/package-lock.json
index 00e3c49f..1d6a94b0 100644
--- a/backend/package-lock.json
+++ b/backend/package-lock.json
@@ -20,6 +20,7 @@
         "express-rate-limit": "^8.2.1",
         "file-type": "^18.5.0",
         "form-data": "^4.0.5",
+        "googleapis": "^174.0.1",
         "helmet": "^8.3.0",
         "joi": "^18.0.2",
         "jsonwebtoken": "^9.0.2",
@@ -152,6 +153,23 @@
         "@hapi/hoek": "^11.0.2"
       }
     },
+    "node_modules/@isaacs/cliui": {
+      "version": "8.0.2",
+      "resolved": "https://registry.npmjs.org/@isaacs/cliui/-/cliui-8.0.2.tgz",
+      "integrity": "sha512-O8jcjabXaleOG9DQ0+ARXWZBTfnP4WNAqzuiJK7ll44AmxGKv/J2M4TPjxjY3znBCfvBXFzucm1twdyFybFqEA==",
+      "license": "ISC",
+      "dependencies": {
+        "string-width": "^5.1.2",
+        "string-width-cjs": "npm:string-width@^4.2.0",
+        "strip-ansi": "^7.0.1",
+        "strip-ansi-cjs": "npm:strip-ansi@^6.0.1",
+        "wrap-ansi": "^8.1.0",
+        "wrap-ansi-cjs": "npm:wrap-ansi@^7.0.0"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/@jridgewell/sourcemap-codec": {
       "version": "1.5.5",
       "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.5.5.tgz",
@@ -404,6 +422,16 @@
         "@noble/hashes": "^1.1.5"
       }
     },
+    "node_modules/@pkgjs/parseargs": {
+      "version": "0.11.0",
+      "resolved": "https://registry.npmjs.org/@pkgjs/parseargs/-/parseargs-0.11.0.tgz",
+      "integrity": "sha512-+1VkjdD0QBLPodGrJUeqarH8VAIvQODIbwh9XpP5Syisf7YoQgsJKPNFoqqLQlu+VQ/tVSshMR6loPMn8U+dPg==",
+      "license": "MIT",
+      "optional": true,
+      "engines": {
+        "node": ">=14"
+      }
+    },
     "node_modules/@rolldown/binding-android-arm64": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/@rolldown/binding-android-arm64/-/binding-android-arm64-1.1.3.tgz",
@@ -918,6 +946,30 @@
         "node": ">= 14"
       }
     },
+    "node_modules/ansi-regex": {
+      "version": "6.2.2",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-6.2.2.tgz",
+      "integrity": "sha512-Bq3SmSpyFHaWjPk8If9yc6svM8c56dB5BAtW4Qbw5jHTwwXXcTLoRMkpDJp6VL0XzlWaCHTXrkFURMYmD0sLqg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-regex?sponsor=1"
+      }
+    },
+    "node_modules/ansi-styles": {
+      "version": "6.2.3",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-6.2.3.tgz",
+      "integrity": "sha512-4Dj6M28JB+oAH8kFkTLUo+a2jwOFkuqb3yucU0CANcRRUbxS0cP0nZYCGjcc3BNXwRIsUVmDGgzawme7zvJHvg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+      }
+    },
     "node_modules/anymatch": {
       "version": "3.1.3",
       "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-3.1.3.tgz",
@@ -1002,7 +1054,6 @@
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.2.tgz",
       "integrity": "sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw==",
-      "dev": true,
       "license": "MIT"
     },
     "node_modules/base64-js": {
@@ -1242,6 +1293,24 @@
         "node": ">=0.8"
       }
     },
+    "node_modules/color-convert": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
+      "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
+      "license": "MIT",
+      "dependencies": {
+        "color-name": "~1.1.4"
+      },
+      "engines": {
+        "node": ">=7.0.0"
+      }
+    },
+    "node_modules/color-name": {
+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
+      "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
+      "license": "MIT"
+    },
     "node_modules/combined-stream": {
       "version": "1.0.8",
       "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.8.tgz",
@@ -1371,6 +1440,29 @@
         "node": ">= 0.10"
       }
     },
+    "node_modules/cross-spawn": {
+      "version": "7.0.6",
+      "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.6.tgz",
+      "integrity": "sha512-uV2QOWP2nWzsy2aMp8aRibhi9dlzF5Hgh5SHaB9OiTGEyDTiJJyx0uy51QXdyWbtAHNua4XJzUKca3OzKUd3vA==",
+      "license": "MIT",
+      "dependencies": {
+        "path-key": "^3.1.0",
+        "shebang-command": "^2.0.0",
+        "which": "^2.0.1"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
+    },
+    "node_modules/data-uri-to-buffer": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/data-uri-to-buffer/-/data-uri-to-buffer-4.0.1.tgz",
+      "integrity": "sha512-0R9ikRb668HB7QDxT1vkpuUBtqc53YyAwMwGeUFKRojY/NWKvdZ+9UYtRfGmhqNbRkTSVpMbmyhXipFFv2cb/A==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 12"
+      }
+    },
     "node_modules/debug": {
       "version": "4.4.3",
       "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",
@@ -1453,6 +1545,12 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/eastasianwidth": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/eastasianwidth/-/eastasianwidth-0.2.0.tgz",
+      "integrity": "sha512-I88TYZWc9XiYHRQ4/3c5rjjfgkjhLyW2luGIheGERbNQ6OY7yTybanSpDXZa8y7VUP9YmDcYa+eyq4ca7iLqWA==",
+      "license": "MIT"
+    },
     "node_modules/ecdsa-sig-formatter": {
       "version": "1.0.11",
       "resolved": "https://registry.npmjs.org/ecdsa-sig-formatter/-/ecdsa-sig-formatter-1.0.11.tgz",
@@ -1468,6 +1566,12 @@
       "integrity": "sha512-WMwm9LhRUo+WUaRN+vRuETqG89IgZphVSNkdFgeb6sS/E4OrDIN7t48CAewSHXc6C8lefD8KKfr5vY61brQlow==",
       "license": "MIT"
     },
+    "node_modules/emoji-regex": {
+      "version": "9.2.2",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-9.2.2.tgz",
+      "integrity": "sha512-L18DaJsXSUk2+42pv8mLs5jJT2hqFkFE4j21wOmgbUqsZ2hL72NsUU785g9RXgo3s0ZNgVl42TiHp3ZtOv/Vyg==",
+      "license": "MIT"
+    },
     "node_modules/encodeurl": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/encodeurl/-/encodeurl-2.0.0.tgz",
@@ -1661,6 +1765,29 @@
       "integrity": "sha512-n11RGP/lrWEFI/bWdygLxhI+pVeo1ZYIVwvvPkW7azl/rOy+F3HYRZ2K5zeE9mmkhQppyv9sQFx0JM9UabnpPQ==",
       "license": "Unlicense"
     },
+    "node_modules/fetch-blob": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/fetch-blob/-/fetch-blob-3.2.0.tgz",
+      "integrity": "sha512-7yAQpD2UMJzLi1Dqv7qFYnPbaPx7ZfFK6PiIxQ4PfkGPyNyl2Ugx+a/umUonmKqjhM4DnfbMvdX6otXq83soQQ==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/jimmywarting"
+        },
+        {
+          "type": "paypal",
+          "url": "https://paypal.me/jimmywarting"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "node-domexception": "^1.0.0",
+        "web-streams-polyfill": "^3.0.3"
+      },
+      "engines": {
+        "node": "^12.20 || >= 14.13"
+      }
+    },
     "node_modules/file-type": {
       "version": "18.7.0",
       "resolved": "https://registry.npmjs.org/file-type/-/file-type-18.7.0.tgz",
@@ -1728,6 +1855,22 @@
         }
       }
     },
+    "node_modules/foreground-child": {
+      "version": "3.3.1",
+      "resolved": "https://registry.npmjs.org/foreground-child/-/foreground-child-3.3.1.tgz",
+      "integrity": "sha512-gIXjKqtFuWEgzFRJA9WCQeSJLZDjgJUOMCMzxtvFq/37KojM1BFGufqsCy0r4qSQmYLsZYMeyRqzIWOMup03sw==",
+      "license": "ISC",
+      "dependencies": {
+        "cross-spawn": "^7.0.6",
+        "signal-exit": "^4.0.1"
+      },
+      "engines": {
+        "node": ">=14"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/isaacs"
+      }
+    },
     "node_modules/form-data": {
       "version": "4.0.5",
       "resolved": "https://registry.npmjs.org/form-data/-/form-data-4.0.5.tgz",
@@ -1765,6 +1908,18 @@
         "node": ">= 0.6"
       }
     },
+    "node_modules/formdata-polyfill": {
+      "version": "4.0.10",
+      "resolved": "https://registry.npmjs.org/formdata-polyfill/-/formdata-polyfill-4.0.10.tgz",
+      "integrity": "sha512-buewHzMvYL29jdeQTVILecSaZKnt/RJWjoZCF5OW60Z67/GmSLBkOFM7qh1PI3zFNtJbaZL5eQu1vLfazOwj4g==",
+      "license": "MIT",
+      "dependencies": {
+        "fetch-blob": "^3.1.2"
+      },
+      "engines": {
+        "node": ">=12.20.0"
+      }
+    },
     "node_modules/formidable": {
       "version": "3.5.4",
       "resolved": "https://registry.npmjs.org/formidable/-/formidable-3.5.4.tgz",
@@ -1892,6 +2047,27 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/glob": {
+      "version": "10.5.0",
+      "resolved": "https://registry.npmjs.org/glob/-/glob-10.5.0.tgz",
+      "integrity": "sha512-DfXN8DfhJ7NH3Oe7cFmu3NCu1wKbkReJ8TorzSAFbSKrlNaQSKfIzqYqVY8zlbs2NLBbWpRiU52GX2PbaBVNkg==",
+      "deprecated": "Old versions of glob are not supported, and contain widely publicized security vulnerabilities, which have been fixed in the current version. Please update. Support for old versions may be purchased (at exorbitant rates) by contacting i@izs.me",
+      "license": "ISC",
+      "dependencies": {
+        "foreground-child": "^3.1.0",
+        "jackspeak": "^3.1.2",
+        "minimatch": "^9.0.4",
+        "minipass": "^7.1.2",
+        "package-json-from-dist": "^1.0.0",
+        "path-scurry": "^1.11.1"
+      },
+      "bin": {
+        "glob": "dist/esm/bin.mjs"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/isaacs"
+      }
+    },
     "node_modules/glob-parent": {
       "version": "5.1.2",
       "resolved": "https://registry.npmjs.org/glob-parent/-/glob-parent-5.1.2.tgz",
@@ -1905,6 +2081,30 @@
         "node": ">= 6"
       }
     },
+    "node_modules/glob/node_modules/brace-expansion": {
+      "version": "2.1.4",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.1.4.tgz",
+      "integrity": "sha512-hGfVzPxthbf3+2yjg/RBs60cB0FhqBS/zvdV/4wn4/BmN0bNMMHPc4V/BbFieqf1TKAGGAHnY4eSjajCl0f2Xg==",
+      "license": "MIT",
+      "dependencies": {
+        "balanced-match": "^1.0.0"
+      }
+    },
+    "node_modules/glob/node_modules/minimatch": {
+      "version": "9.0.9",
+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-9.0.9.tgz",
+      "integrity": "sha512-OBwBN9AL4dqmETlpS2zasx+vTeWclWzkblfZk7KTA5j3jeOONz/tRCnZomUyvNg83wL5Zv9Ss6HMJXAgL8R2Yg==",
+      "license": "ISC",
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+      "engines": {
+        "node": ">=14"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/isaacs"
+      }
+    },
     "node_modules/simple-update-notifier": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/simple-update-notifier/-/simple-update-notifier-2.0.0.tgz",
@@ -3642,6 +4213,102 @@
         "safe-buffer": "~5.2.0"
       }
     },
+    "node_modules/string-width": {
+      "version": "5.1.2",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-5.1.2.tgz",
+      "integrity": "sha512-HnLOCR3vjcY8beoNLtcjZ5/nxn2afmME6lhrDrebokqMap+XbeW8n9TXpPDOqdGK5qcI3oT0GKTW6wC7EMiVqA==",
+      "license": "MIT",
+      "dependencies": {
+        "eastasianwidth": "^0.2.0",
+        "emoji-regex": "^9.2.2",
+        "strip-ansi": "^7.0.1"
+      },
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/string-width-cjs": {
+      "name": "string-width",
+      "version": "4.2.3",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
+      "integrity": "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==",
+      "license": "MIT",
+      "dependencies": {
+        "emoji-regex": "^8.0.0",
+        "is-fullwidth-code-point": "^3.0.0",
+        "strip-ansi": "^6.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/string-width-cjs/node_modules/ansi-regex": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
+      "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/string-width-cjs/node_modules/emoji-regex": {
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
+      "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==",
+      "license": "MIT"
+    },
+    "node_modules/string-width-cjs/node_modules/strip-ansi": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
+      "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
+      "license": "MIT",
+      "dependencies": {
+        "ansi-regex": "^5.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/strip-ansi": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-7.2.0.tgz",
+      "integrity": "sha512-yDPMNjp4WyfYBkHnjIRLfca1i6KMyGCtsVgoKe/z1+6vukgaENdgGBZt+ZmKPc4gavvEZ5OgHfHdrazhgNyG7w==",
+      "license": "MIT",
+      "dependencies": {
+        "ansi-regex": "^6.2.2"
+      },
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/strip-ansi?sponsor=1"
+      }
+    },
+    "node_modules/strip-ansi-cjs": {
+      "name": "strip-ansi",
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
+      "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
+      "license": "MIT",
+      "dependencies": {
+        "ansi-regex": "^5.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/strip-ansi-cjs/node_modules/ansi-regex": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
+      "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/strtok3": {
       "version": "7.1.1",
       "resolved": "https://registry.npmjs.org/strtok3/-/strtok3-7.1.1.tgz",
@@ -3882,6 +4549,12 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/url-template": {
+      "version": "2.0.8",
+      "resolved": "https://registry.npmjs.org/url-template/-/url-template-2.0.8.tgz",
+      "integrity": "sha512-XdVKMF4SJ0nP/O7XIPB0JwAEuT9lDIYnNsK8yGVe43y0AWoKeJNdv3ZNWh7ksJ6KqQFjOO6ox/VEitLnaVNufw==",
+      "license": "BSD"
+    },
     "node_modules/util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
@@ -4104,6 +4777,15 @@
         "url": "https://github.com/sponsors/jonschlinkert"
       }
     },
+    "node_modules/web-streams-polyfill": {
+      "version": "3.3.3",
+      "resolved": "https://registry.npmjs.org/web-streams-polyfill/-/web-streams-polyfill-3.3.3.tgz",
+      "integrity": "sha512-d2JWLCivmZYTSIoge9MsgFCZrt571BikcWGYkjC1khllbTeDlGqZ2D8vD8E/lJa8WGWbb7Plm8/XJYV7IJHZZw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 8"
+      }
+    },
     "node_modules/webidl-conversions": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-3.0.1.tgz",
@@ -4120,6 +4802,21 @@
         "webidl-conversions": "^3.0.0"
       }
     },
+    "node_modules/which": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
+      "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
+      "license": "ISC",
+      "dependencies": {
+        "isexe": "^2.0.0"
+      },
+      "bin": {
+        "node-which": "bin/node-which"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
+    },
     "node_modules/why-is-node-running": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-2.3.0.tgz",
@@ -4137,6 +4834,97 @@
         "node": ">=8"
       }
     },
+    "node_modules/wrap-ansi": {
+      "version": "8.1.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-8.1.0.tgz",
+      "integrity": "sha512-si7QWI6zUMq56bESFvagtmzMdGOtoxfR+Sez11Mobfc7tm+VkUckk9bW2UeffTGVUbOksxmSw0AA2gs8g71NCQ==",
+      "license": "MIT",
+      "dependencies": {
+        "ansi-styles": "^6.1.0",
+        "string-width": "^5.0.1",
+        "strip-ansi": "^7.0.1"
+      },
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
+      }
+    },
+    "node_modules/wrap-ansi-cjs": {
+      "name": "wrap-ansi",
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz",
+      "integrity": "sha512-YVGIj2kamLSTxw6NsZjoBxfSwsn0ycdesmc4p+Q21c5zPuZ1pl+NfxVdxPtdHvmNVOQ6XSYG4AUtyt/Fi7D16Q==",
+      "license": "MIT",
+      "dependencies": {
+        "ansi-styles": "^4.0.0",
+        "string-width": "^4.1.0",
+        "strip-ansi": "^6.0.0"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
+      }
+    },
+    "node_modules/wrap-ansi-cjs/node_modules/ansi-regex": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
+      "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/wrap-ansi-cjs/node_modules/ansi-styles": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
+      "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
+      "license": "MIT",
+      "dependencies": {
+        "color-convert": "^2.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+      }
+    },
+    "node_modules/wrap-ansi-cjs/node_modules/emoji-regex": {
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
+      "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==",
+      "license": "MIT"
+    },
+    "node_modules/wrap-ansi-cjs/node_modules/string-width": {
+      "version": "4.2.3",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
+      "integrity": "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==",
+      "license": "MIT",
+      "dependencies": {
+        "emoji-regex": "^8.0.0",
+        "is-fullwidth-code-point": "^3.0.0",
+        "strip-ansi": "^6.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/wrap-ansi-cjs/node_modules/strip-ansi": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
+      "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
+      "license": "MIT",
+      "dependencies": {
+        "ansi-regex": "^5.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
diff --git a/backend/package.json b/backend/package.json
index 821fd406..4e6adc23 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -23,6 +23,7 @@
     "express-rate-limit": "^8.2.1",
     "file-type": "^18.5.0",
     "form-data": "^4.0.5",
+    "googleapis": "^174.0.1",
     "helmet": "^8.3.0",
     "joi": "^18.0.2",
     "jsonwebtoken": "^9.0.2",
diff --git a/backend/routes/googleCalendarRoutes.js b/backend/routes/googleCalendarRoutes.js
new file mode 100644
index 00000000..9ef70c3d
--- /dev/null
+++ b/backend/routes/googleCalendarRoutes.js
@@ -0,0 +1,17 @@
+const express = require("express");
+const { protect } = require("../middlewares/authMiddleware");
+const {
+  connectGoogleCalendar,
+  handleGoogleCalendarCallback,
+  getGoogleCalendarStatus,
+  syncGoogleCalendarEvent,
+} = require("../controllers/googleCalendarController");
+
+const router = express.Router();
+
+router.get("/connect", protect, connectGoogleCalendar);
+router.get("/callback", handleGoogleCalendarCallback);
+router.get("/status", protect, getGoogleCalendarStatus);
+router.post("/events", protect, syncGoogleCalendarEvent);
+
+module.exports = router;
diff --git a/backend/server.js b/backend/server.js
index 1a6341b8..5be29095 100644
--- a/backend/server.js
+++ b/backend/server.js
@@ -19,6 +19,7 @@ const {
 const { protect } = require("./middlewares/authMiddleware");
 const authRoutes = require("./routes/authRoutes");
 const sessionRoutes = require("./routes/sessionRoutes");
+const googleCalendarRoutes = require("./routes/googleCalendarRoutes");
 const questionRoutes = require("./routes/questionRoutes");
 const aiRoutes = require("./routes/aiRoutes");
 const resumeRoutes = require("./routes/resumeRoutes");
@@ -93,6 +94,7 @@ app.use(cookieParser());
 
 //Routes
 app.use("/api/auth", sensitiveRouteHeaders,authRoutes);
+app.use("/api/google-calendar", sensitiveRouteHeaders, googleCalendarRoutes);
 app.use("/api/sessions", generalLimiter, sessionRoutes);
 app.use("/api/question", generalLimiter, questionRoutes);
 app.use("/api", aiRoutes);
diff --git a/backend/services/googleCalendarService.js b/backend/services/googleCalendarService.js
new file mode 100644
index 00000000..5a016c0c
--- /dev/null
+++ b/backend/services/googleCalendarService.js
@@ -0,0 +1,175 @@
+const crypto = require("crypto");
+const { google } = require("googleapis");
+
+const GOOGLE_CALENDAR_SCOPES = ["https://www.googleapis.com/auth/calendar.events"];
+const ENCRYPTION_ALGORITHM = "aes-256-gcm";
+const ENCRYPTION_KEY = crypto
+  .createHash("sha256")
+  .update(process.env.JWT_SECRET || "prep-pilot-google-calendar")
+  .digest();
+
+const getGoogleOAuthClient = () => {
+  const clientId = process.env.GOOGLE_CLIENT_ID;
+  const clientSecret = process.env.GOOGLE_CLIENT_SECRET;
+  const redirectUri = process.env.GOOGLE_REDIRECT_URI;
+
+  if (!clientId || !clientSecret || !redirectUri) {
+    throw new Error("Google Calendar integration is not configured.");
+  }
+
+  return new google.auth.OAuth2(clientId, clientSecret, redirectUri);
+};
+
+const encryptSecret = (value) => {
+  if (!value) return null;
+
+  const iv = crypto.randomBytes(12);
+  const cipher = crypto.createCipheriv(ENCRYPTION_ALGORITHM, ENCRYPTION_KEY, iv);
+  const encrypted = Buffer.concat([
+    cipher.update(Buffer.from(value, "utf8")),
+    cipher.final(),
+  ]);
+  const tag = cipher.getAuthTag();
+
+  return Buffer.concat([iv, tag, encrypted]).toString("base64");
+};
+
+const decryptSecret = (value) => {
+  if (!value) return null;
+
+  try {
+    const buffer = Buffer.from(value, "base64");
+    const iv = buffer.subarray(0, 12);
+    const tag = buffer.subarray(12, 28);
+    const encrypted = buffer.subarray(28);
+    const decipher = crypto.createDecipheriv(ENCRYPTION_ALGORITHM, ENCRYPTION_KEY, iv);
+    decipher.setAuthTag(tag);
+
+    return Buffer.concat([decipher.update(encrypted), decipher.final()]).toString("utf8");
+  } catch (error) {
+    console.error("Failed to decrypt Google Calendar token:", error.message);
+    return null;
+  }
+};
+
+const getGoogleCalendarAuthUrl = (userId) => {
+  const oauth2Client = getGoogleOAuthClient();
+  const state = `${userId}:${crypto.randomBytes(8).toString("hex")}`;
+  const authUrl = oauth2Client.generateAuthUrl({
+    access_type: "offline",
+    prompt: "consent",
+    scope: GOOGLE_CALENDAR_SCOPES,
+    state,
+  });
+
+  return { authUrl, state };
+};
+
+const exchangeGoogleCalendarCode = async (code) => {
+  const oauth2Client = getGoogleOAuthClient();
+  const { tokens } = await oauth2Client.getToken(code);
+
+  return {
+    accessToken: tokens.access_token || null,
+    refreshToken: tokens.refresh_token || null,
+    expiryDate: tokens.expiry_date ? new Date(tokens.expiry_date).toISOString() : null,
+    scope: tokens.scope || GOOGLE_CALENDAR_SCOPES.join(" "),
+  };
+};
+
+const buildCalendarEventPayload = (payload) => {
+  const startTime = payload.startTime ? new Date(payload.startTime) : new Date(Date.now() + 60 * 60 * 1000);
+  const endTime = payload.endTime ? new Date(payload.endTime) : new Date(startTime.getTime() + 60 * 60 * 1000);
+  const reminderMinutes = Number(payload.reminderMinutes || 10);
+
+  return {
+    summary: payload.title || "PrepPilot Interview Prep",
+    description: payload.description || "Synced from PrepPilot",
+    start: {
+      dateTime: startTime.toISOString(),
+      timeZone: "UTC",
+    },
+    end: {
+      dateTime: endTime.toISOString(),
+      timeZone: "UTC",
+    },
+    reminders: {
+      useDefault: false,
+      overrides: [{ method: "popup", minutes: reminderMinutes }],
+    },
+  };
+};
+
+const createOrUpdateGoogleCalendarEvent = async (user, payload) => {
+  if (!user) {
+    throw new Error("User is required");
+  }
+
+  const accessToken = decryptSecret(user.googleCalendarAccessToken);
+  const refreshToken = decryptSecret(user.googleCalendarRefreshToken);
+
+  if (!accessToken || !refreshToken) {
+    throw new Error("Google Calendar is not connected");
+  }
+
+  const oauth2Client = getGoogleOAuthClient();
+  oauth2Client.setCredentials({
+    access_token: accessToken,
+    refresh_token: refreshToken,
+    expiry_date: user.googleCalendarTokenExpiry ? new Date(user.googleCalendarTokenExpiry).getTime() : undefined,
+  });
+
+  if (user.googleCalendarTokenExpiry && new Date(user.googleCalendarTokenExpiry).getTime() <= Date.now()) {
+    try {
+      const { credentials } = await oauth2Client.refreshAccessToken();
+      return {
+        credentials: {
+          accessToken: credentials.access_token || accessToken,
+          refreshToken: credentials.refresh_token || refreshToken,
+          expiryDate: credentials.expiry_date ? new Date(credentials.expiry_date).toISOString() : null,
+        },
+      };
+    } catch (error) {
+      throw new Error("expired");
+    }
+  }
+
+  const calendar = google.calendar({ version: "v3", auth: oauth2Client });
+  const requestBody = buildCalendarEventPayload(payload);
+  const calendarId = payload.calendarId || "primary";
+
+  const response = payload.eventId
+    ? await calendar.events.update({ calendarId, eventId: payload.eventId, requestBody })
+    : await calendar.events.insert({ calendarId, requestBody });
+
+  return {
+    eventId: response.data.id,
+    htmlLink: response.data.htmlLink,
+    credentials: {
+      accessToken,
+      refreshToken,
+      expiryDate: user.googleCalendarTokenExpiry ? new Date(user.googleCalendarTokenExpiry).toISOString() : null,
+    },
+  };
+};
+
+const getGoogleCalendarConnectionStatus = async (user) => {
+  if (!user) {
+    return { connected: false };
+  }
+
+  return {
+    connected: Boolean(user.googleCalendarConnected),
+    email: user.googleCalendarEmail || null,
+    connectedAt: user.googleCalendarConnectedAt || null,
+  };
+};
+
+module.exports = {
+  encryptSecret,
+  decryptSecret,
+  getGoogleCalendarAuthUrl,
+  exchangeGoogleCalendarCode,
+  createOrUpdateGoogleCalendarEvent,
+  getGoogleCalendarConnectionStatus,
+};
diff --git a/backend/tests/googleCalendarController.unit.test.js b/backend/tests/googleCalendarController.unit.test.js
new file mode 100644
index 00000000..3b21477a
--- /dev/null
+++ b/backend/tests/googleCalendarController.unit.test.js
@@ -0,0 +1,49 @@
+import { describe, it, expect, vi } from 'vitest';
+
+process.env.GOOGLE_CLIENT_ID = 'client-id';
+process.env.GOOGLE_CLIENT_SECRET = 'client-secret';
+process.env.GOOGLE_REDIRECT_URI = 'http://localhost:8000/api/google-calendar/callback';
+
+const {
+  connectGoogleCalendar,
+  getGoogleCalendarStatus,
+  syncGoogleCalendarEvent,
+} = await import('../controllers/googleCalendarController.js');
+
+function makeRes() {
+  const res = {};
+  res.status = vi.fn().mockReturnValue(res);
+  res.json = vi.fn().mockReturnValue(res);
+  res.redirect = vi.fn().mockReturnValue(res);
+  return res;
+}
+
+function makeReq(body = {}, user = { _id: 'user-123' }) {
+  return { body, user };
+}
+
+describe('google calendar controller', () => {
+  it('returns an auth URL for a connected user', async () => {
+    const res = makeRes();
+    await connectGoogleCalendar(makeReq(), res);
+
+    expect(res.status).toHaveBeenCalledWith(200);
+    expect(res.json).toHaveBeenCalledWith(expect.objectContaining({ success: true, authUrl: expect.any(String) }));
+  });
+
+  it('rejects sync requests that are missing required event details', async () => {
+    const res = makeRes();
+    await syncGoogleCalendarEvent(makeReq({ title: 'Mock Interview' }), res);
+
+    expect(res.status).toHaveBeenCalledWith(400);
+    expect(res.json).toHaveBeenCalledWith(expect.objectContaining({ success: false }));
+  });
+
+  it('returns status for the current user', async () => {
+    const res = makeRes();
+    await getGoogleCalendarStatus(makeReq({}, { _id: 'user-123', googleCalendarConnected: true, googleCalendarEmail: 'test@example.com' }), res);
+
+    expect(res.status).toHaveBeenCalledWith(200);
+    expect(res.json).toHaveBeenCalledWith(expect.objectContaining({ success: true, connected: true }));
+  });
+});
diff --git a/backend/tests/interviewStreak.unit.test.js b/backend/tests/interviewStreak.unit.test.js
new file mode 100644
index 00000000..01b9b2ba
--- /dev/null
+++ b/backend/tests/interviewStreak.unit.test.js
@@ -0,0 +1,97 @@
+import { describe, it, expect } from 'vitest';
+import { getInterviewStreakUpdate } from '../utils/interviewStreak';
+
+describe('interview streak tracking', () => {
+  it('starts a new streak on the first practice day', () => {
+    const result = getInterviewStreakUpdate({
+      interviewStreak: 0,
+      longestInterviewStreak: 0,
+      interviewStreakBadges: [],
+      interviewStreakLastPracticeDate: null,
+    }, '2026-08-01');
+
+    expect(result.streak).toBe(1);
+    expect(result.longestStreak).toBe(1);
+    expect(result.badges).toEqual([]);
+    expect(result.changed).toBe(true);
+  });
+
+  it('increments the streak on consecutive practice days', () => {
+    const result = getInterviewStreakUpdate({
+      interviewStreak: 1,
+      longestInterviewStreak: 1,
+      interviewStreakBadges: [],
+      interviewStreakLastPracticeDate: '2026-07-31',
+    }, '2026-08-01');
+
+    expect(result.streak).toBe(2);
+    expect(result.longestStreak).toBe(2);
+    expect(result.changed).toBe(true);
+  });
+
+  it('resets the streak after missing a day', () => {
+    const result = getInterviewStreakUpdate({
+      interviewStreak: 2,
+      longestInterviewStreak: 2,
+      interviewStreakBadges: [],
+      interviewStreakLastPracticeDate: '2026-07-29',
+    }, '2026-08-01');
+
+    expect(result.streak).toBe(1);
+    expect(result.longestStreak).toBe(2);
+    expect(result.changed).toBe(true);
+  });
+
+  it('unlocks milestone badges at 3, 7 and 30 days', () => {
+    const threeDayResult = getInterviewStreakUpdate({
+      interviewStreak: 2,
+      longestInterviewStreak: 2,
+      interviewStreakBadges: [],
+      interviewStreakLastPracticeDate: '2026-07-30',
+    }, '2026-07-31');
+
+    const sevenDayResult = getInterviewStreakUpdate({
+      interviewStreak: 6,
+      longestInterviewStreak: 6,
+      interviewStreakBadges: ['3 days'],
+      interviewStreakLastPracticeDate: '2026-07-30',
+    }, '2026-07-31');
+
+    const thirtyDayResult = getInterviewStreakUpdate({
+      interviewStreak: 29,
+      longestInterviewStreak: 29,
+      interviewStreakBadges: ['3 days', '7 days'],
+      interviewStreakLastPracticeDate: '2026-07-31',
+    }, '2026-08-01');
+
+    expect(threeDayResult.badges).toEqual(['3 days']);
+    expect(sevenDayResult.badges).toEqual(['3 days', '7 days']);
+    expect(thirtyDayResult.badges).toEqual(['3 days', '7 days', '30 days']);
+  });
+
+  it('does not increment twice for duplicate practice on the same day', () => {
+    const result = getInterviewStreakUpdate({
+      interviewStreak: 3,
+      longestInterviewStreak: 3,
+      interviewStreakBadges: ['3 days'],
+      interviewStreakLastPracticeDate: '2026-08-01',
+    }, '2026-08-01');
+
+    expect(result.streak).toBe(3);
+    expect(result.longestStreak).toBe(3);
+    expect(result.badges).toEqual(['3 days']);
+    expect(result.changed).toBe(false);
+  });
+
+  it('updates the longest streak when a new peak is reached', () => {
+    const result = getInterviewStreakUpdate({
+      interviewStreak: 4,
+      longestInterviewStreak: 4,
+      interviewStreakBadges: ['3 days'],
+      interviewStreakLastPracticeDate: '2026-07-30',
+    }, '2026-07-31');
+
+    expect(result.streak).toBe(5);
+    expect(result.longestStreak).toBe(5);
+  });
+});
diff --git a/backend/utils/interviewStreak.js b/backend/utils/interviewStreak.js
new file mode 100644
index 00000000..6691b865
--- /dev/null
+++ b/backend/utils/interviewStreak.js
@@ -0,0 +1,67 @@
+const MILESTONE_BADGES = ['3 days', '7 days', '30 days'];
+
+const parseDateOnly = (value) => {
+  if (!value || typeof value !== 'string') return null;
+
+  const [year, month, day] = value.split('-').map(Number);
+  if (!year || !month || !day) return null;
+
+  return new Date(Date.UTC(year, month - 1, day));
+};
+
+const getInterviewStreakUpdate = (userData = {}, practiceDate) => {
+  if (!practiceDate || typeof practiceDate !== 'string') {
+    return {
+      streak: Number(userData.interviewStreak || 0),
+      longestStreak: Number(userData.longestInterviewStreak || 0),
+      badges: Array.isArray(userData.interviewStreakBadges) ? userData.interviewStreakBadges : [],
+      changed: false,
+    };
+  }
+
+  const currentStreak = Number(userData.interviewStreak || 0);
+  const longestStreak = Number(userData.longestInterviewStreak || 0);
+  const badges = Array.isArray(userData.interviewStreakBadges) ? [...userData.interviewStreakBadges] : [];
+  const lastPracticeDate = userData.interviewStreakLastPracticeDate;
+
+  const today = parseDateOnly(practiceDate);
+  const lastPractice = parseDateOnly(lastPracticeDate);
+  const sameDay = Boolean(today && lastPractice && today.getTime() === lastPractice.getTime());
+
+  let nextStreak = currentStreak;
+  let changed = false;
+
+  if (!sameDay) {
+    if (lastPractice && today) {
+      const diffDays = Math.round((today.getTime() - lastPractice.getTime()) / (1000 * 60 * 60 * 24));
+      if (diffDays === 1) {
+        nextStreak = currentStreak + 1;
+      } else {
+        nextStreak = 1;
+      }
+    } else {
+      nextStreak = 1;
+    }
+
+    changed = true;
+  }
+
+  const nextLongest = Math.max(longestStreak, nextStreak);
+  const nextBadges = [...badges];
+
+  for (const milestone of MILESTONE_BADGES) {
+    const threshold = Number(milestone.split(' ')[0]);
+    if (nextLongest >= threshold && !nextBadges.includes(milestone)) {
+      nextBadges.push(milestone);
+    }
+  }
+
+  return {
+    streak: nextStreak,
+    longestStreak: nextLongest,
+    badges: nextBadges,
+    changed,
+  };
+};
+
+module.exports = { getInterviewStreakUpdate, MILESTONE_BADGES };
diff --git a/frontend/src/pages/Home/CreateSessionForm.jsx b/frontend/src/pages/Home/CreateSessionForm.jsx
index 444f32cd..de52ecbe 100644
--- a/frontend/src/pages/Home/CreateSessionForm.jsx
+++ b/frontend/src/pages/Home/CreateSessionForm.jsx
@@ -1,8 +1,9 @@
-import React, { useState } from "react";
+import React, { useContext, useState } from "react";
 import { useNavigate } from "react-router-dom";
 import SpinnerLoader from "../../components/Loader/SpinnerLoader";
 import axiosInstance from "../../utils/axiosinstance";
 import { API_PATHS } from "../../utils/apiPaths";
+import { UserContext } from "../../context/userContext";
 import { Target, Briefcase, Code2, FileText, Sparkles } from "lucide-react";
 
 const MAX_EXPERIENCE = 50;
@@ -18,6 +19,7 @@ const CreateSessionForm = () => {
 
   const [isLoading, setIsLoading] = useState(false);
   const [error, setError] = useState(null);
+  const { user, updateUser } = useContext(UserContext);
 
   const navigate = useNavigate();
 
@@ -80,6 +82,14 @@ if (experienceValue > MAX_EXPERIENCE) {
       });
 
       if (response.data?.session?._id) {
+        if (response.data?.streakSummary) {
+          updateUser({
+            ...(user || {}),
+            interviewStreak: response.data.streakSummary.current,
+            longestInterviewStreak: response.data.streakSummary.longest,
+            interviewStreakBadges: response.data.streakSummary.badges || [],
+          });
+        }
         navigate(`/interview-prep/${response.data?.session?._id}`);
       }
     } catch (error) {
diff --git a/frontend/src/pages/Home/Dashboard.jsx b/frontend/src/pages/Home/Dashboard.jsx
index ada3170a..69bb379d 100644
--- a/frontend/src/pages/Home/Dashboard.jsx
+++ b/frontend/src/pages/Home/Dashboard.jsx
@@ -1,4 +1,4 @@
-import React, { useEffect, useState } from "react";
+import React, { useContext, useEffect, useState } from "react";
 import { LuPlus } from "react-icons/lu";
 import toast from "react-hot-toast";
 import { useNavigate } from "react-router-dom";
@@ -13,9 +13,11 @@ import DeleteAlertContent from "../../components/DeleteAlertContent";
 import axiosInstance from "../../utils/axiosinstance";
 import { API_PATHS } from "../../utils/apiPaths";
 import { CARD_BG } from "../../utils/data";
+import { UserContext } from "../../context/userContext";
 
 const Dashboard = () => {
   const navigate = useNavigate();
+  const { user } = useContext(UserContext);
   const [sessions, setSessions] = useState([]);
   const [openCreateModal, setOpenCreateModal] = useState(false);
   const [openDeleteAlert, setOpenDeleteAlert] = useState({
@@ -75,6 +77,50 @@ const Dashboard = () => {
             </button>
           </div>
 
+          <div className="mb-8 rounded-2xl border border-gray-200/80 bg-white/80 p-5 shadow-sm backdrop-blur dark:border-white/10 dark:bg-slate-900/70">
+            <div className="flex items-start justify-between gap-4">
+              <div>
+                <p className="text-sm font-semibold uppercase tracking-[0.24em] text-violet-600 dark:text-violet-400">
+                  Interview Streak
+                </p>
+                <h2 className="mt-2 text-lg font-semibold text-gray-900 dark:text-white">
+                  Keep your practice rhythm alive
+                </h2>
+              </div>
+              <div className="rounded-full bg-orange-100 p-3 text-2xl text-orange-600 dark:bg-orange-500/15 dark:text-orange-300">
+                🔥
+              </div>
+            </div>
+
+            <div className="mt-5 grid gap-4 md:grid-cols-3">
+              <div className="rounded-xl border border-gray-200 bg-gray-50/70 p-4 dark:border-white/10 dark:bg-slate-800/70">
+                <p className="text-sm text-gray-500 dark:text-gray-400">Current Streak</p>
+                <p className="mt-2 text-2xl font-bold text-gray-900 dark:text-white">
+                  {user?.interviewStreak ?? 0} days
+                </p>
+              </div>
+              <div className="rounded-xl border border-gray-200 bg-gray-50/70 p-4 dark:border-white/10 dark:bg-slate-800/70">
+                <p className="text-sm text-gray-500 dark:text-gray-400">Best Streak</p>
+                <p className="mt-2 text-2xl font-bold text-gray-900 dark:text-white">
+                  {user?.longestInterviewStreak ?? 0} days
+                </p>
+              </div>
+              <div className="rounded-xl border border-gray-200 bg-gray-50/70 p-4 dark:border-white/10 dark:bg-slate-800/70">
+                <p className="text-sm text-gray-500 dark:text-gray-400">Earned Badges</p>
+                <div className="mt-2 flex flex-wrap gap-2">
+                  {(user?.interviewStreakBadges?.length ? user.interviewStreakBadges : ["No badges yet"]).map((badge) => (
+                    <span
+                      key={badge}
+                      className={`rounded-full px-3 py-1 text-xs font-semibold ${badge === "No badges yet" ? "bg-gray-200 text-gray-700 dark:bg-slate-700 dark:text-slate-200" : "bg-amber-100 text-amber-800 dark:bg-amber-500/15 dark:text-amber-300"}`}
+                    >
+                      {badge}
+                    </span>
+                  ))}
+                </div>
+              </div>
+            </div>
+          </div>
+
           {/* Sessions Grid */}
           {sessions.length > 0 ? (
             <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">