I specialize in microservices development and am skilled in designing and integrating RESTful APIs.

I confidently utilize CI/CD tools such as Jenkins and GitLab CI/CD, and have experience with containerization (Docker) and orchestration systems (Kubernetes). I am also proficient with both relational and non-relational databases, including PostgreSQL, MySQL, and MongoDB

I actively use messaging tools such as RabbitMQ and Kafka, and I adhere to Agile/Scrum methodologies, which enable me to work effectively in teams and adapt to changes.

In addition to technical skills, I value the importance of communication and collaboration within a team and am always ready to share knowledge and experience with colleagues. My goal is to create reliable and high-performance solutions that deliver value to users and the business.

Projects methods: Agile, Scrum, Kanban, Jira

DevOps layer
CI: Jenkins, GitLab CI, GitHub Actions, Travis CI (Codecov.io, JaCoCo)
CD: Docker, Docker Compose
Orchestration: Kubernetes(elementary)

Monitoring: Prometheus, Grafana, ELK Stack(elementary)
VCS: Git, GitHub, GitLab, Bitbucket
Build: Maven, Gradle

Front layer(elementary)
frameworks: React, Vue.js (elementary)
tools: Webpack, npm, Bootstrap 5 (elementary)
basic: HTML5/CSS3, JavaScript (ES6+), jQuery, JSTL, Thymeleaf

Message Brokers: Kafka (Kafka Streams, Kafka Connect), RabbitMQ

Security
level 3: Spring Security, OAuth2, JWT (basic)
level 2: SQL injection, XSS, CSRF (elementary)
level 1: JAAS, GSS, Kerberos

Spring Ecosystem
microservices: Spring Cloud (Gateway, Config, OpenFeign)
web: Spring WEB (Rest), Spring MVC
base: Spring Framework, Spring Core, Spring Boot

Documentation: Javadoc, Confluence, Swagger(elementary), PlantUML
Static analysis: SonarQube, Checkstyle, PMD(elementary)

Test
level 3: Testcontainers, Selenium(elementary)
level 2: Mockito, JUnit 5, AssertJ
level 1: JUnit 4, Hamcrest

Service layer
boilerplate reduction library: Lombok
log: Slf4j, logback, reload4j(log4j), java.util.logging
web scraping, parsing html: Jsoup
Patterns: SOLID, DDD, TDD
Principles: KISS, DRY, YAGNI
Technologies Java: Stream API, Concurrency, NIO2, OOP, etc.
Java: 8-21 SE, EE (part), Java Core

Db layer
tools: pgAdmin, DBeaver, DataGrip
db migration tools: Liquibase, Flyway
ORM: Spring Data JPA, JPQL, JPA Named Queries, Hibernate, HQL
JDBC: jdbcTemplate, JDBC
NoSQL: MongoDB, Redis(elementary)
db: Postgres, H2, HSQLDB, MySQL, Oracle

OS layer
tools: top, htop, lsof, ps, systemctl, etc.
OS: Windows, Ubuntu, SintezM(RHEL)

Networking layer
tools level 2: WinSCP, Postman, Curl, PuTTY
tools level 1: tcpdump, netstat, traceroute, etc.
protocol: http, https, ssh, tcp/ip, REST, WebSocket, gRPC(elementary)
model: OSI

Various projects

Questions about Agile           Jenkins

Docker Example           Docker Compose

Kafka Connect

Task Monolith   and   Task Microservises

Microservices Start           Library

A collection web crawler, spider and resources in different languages

Jsoup

Connecting two or more data sources

Postgresql Lessons           PgAdmin

1500+ Interview Questions Java           Solving LeetCode problems in Java

Solve tests and problems from Tinkoff           Yandex tasks

100 practical programming projects across web, AI, systems, and more.

Ubuntu cheat sheet for beginners           Repackaging the project code for analysis in chatbots

Microservices Start           Hibernate

Path length checking utility           Multithreaded Programming - Walking Robot

Lombok           Enum

Grokking Algorithms in Java - Aditya Y. Bhargava

1000 algorithmic problems from the site acmp.ru