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darekwojciechowski/README.md

Hi, I'm Darek 👋🐍

Software Tester · Python & Test Automation · Automation & Robotics engineer

Python Playwright pytest GitHub Actions (CI/CD) TypeScript pandas Streamlit

Hypothesis (property-based testing) mutmut (mutation testing) axe-core (WCAG accessibility testing) pandera (data contracts) mypy strict

01 — About me

I'm a Software Tester with a degree in Automation and Robotics. I write automated tests, break things on purpose, and build Python tools that clean up messy real-world data.

Most of my projects sit in financial data engineering, with test suites built to prove the code is correct.

  • Preparing for ISTQB CTFL v4.0 — built my own interactive study lab for it (below)
  • I care about testing beyond happy paths: property-based, mutation, contract & E2E
  • FinTech side-quests: dividends, taxes, and personal-finance automation

02 — Testing highlights

The numbers behind the pinned repos below.

  • XTB Dividend Tax Analyzer — 600+ tests across 8 tiers: unit, integration, property-based (Hypothesis), mutation, contract, fuzz, metamorphic & security.
  • Dividend Dashboard — Playwright E2E suite for the Streamlit UI with Page Object Model, axe-core accessibility (WCAG) and responsive tests.
  • Bank Transaction Categorizer — property-based tests (Hypothesis), mypy strict, and CI/CD quality gates.
  • ISTQB CTFL v4.0 Study Lab — Playwright E2E on a cross-browser matrix (Firefox, WebKit, mobile Safari) + Vitest unit suite + CI, with a live demo on GitHub Pages.

03 — Tech & tools

  • Languages — Python · TypeScript · Bash
  • Testing (Python) — pytest · Hypothesis (property-based) · pandera (schema/contract) · mutmut (mutation) · bandit & safety (security) · tox
  • Testing (Web) — Playwright (E2E) · Vitest · Testing Library
  • Data & viz — pandas · NumPy · Plotly · Streamlit · openpyxl
  • Web & GUI — React 19 · Vite · CustomTkinter
  • DevOps — Docker · Makefile · GitHub Actions (CI/CD) · pre-commit
  • Quality & tooling — mypy (strict) · ruff · ESLint · Poetry · pydantic · loguru
  • AI-assisted — Claude Code (primary) · Gemini · GitHub Copilot · Cursor · n8n · MCP servers

04 — Currently

Building self-hosted apps end to end: React + Vite + Tailwind + shadcn/ui on the frontend, FastAPI + PostgreSQL + Alembic on the backend, shipped with Docker. I test them the same way, end to end, with Playwright E2E suites, API tests, and CI quality gates against my own production code.

Pinned Loading

  1. istqb-foundation-4-study-lab istqb-foundation-4-study-lab Public

    Unofficial interactive study lab for the ISTQB CTFL v4.0 exam — quizzes, exam simulator, flashcards, and scenario drills, 100% in-browser.

    TypeScript 1

  2. Streamlit-Dividend-Dashboard Streamlit-Dividend-Dashboard Public

    An interactive Streamlit dashboard for analyzing dividend data and projecting future growth

    Python

  3. xtb-dividend-analysis xtb-dividend-analysis Public

    Processes XTB broker financial data, applies transformations, and exports results to a Google Sheets-compatible CSV.

    Python

  4. look-at-the-cash-bubblin look-at-the-cash-bubblin Public

    Getting that financial flow just right 💰

    Python