Valeriy Stavyanko - Software Engineer

Contact Information

Email: yirelav@protonmail.com

Telegram: @undefinedman

Location: Serbia | Open to relocation

Skills

Professional Summary

A passionate Software Engineer with over 6 years of development experience, including 3.5+ years specializing in Java.

Skilled in designing and implementing scalable backend solutions using microservices architecture, API development, and database optimization.

Adept at mentoring junior developers, conducting code reviews, and ensuring high-quality releases.

Work Experience (3 years 6 months)

Senior Java Developer | Kameleoon (France)

March 2023 – Present

  • Optimized and refactored the Feature Flags management system, ensuring high availability and reliability.
  • Designed and maintained REST and GraphQL APIs to manage Feature Flags and auxiliary systems.
  • Integrated external services such as Zapier and Vercel.
  • Developed and maintained automated tests for critical components, increasing release quality and stability.
  • Implemented static code analysis tools to enhance code quality.
  • Improved system performance by optimizing database queries and data processing logic.
  • Led the migration from monolithic architecture to microservices, simplifying codebase management and accelerating deployments.
  • Mentored junior developers, provided constructive feedback during code reviews, and facilitated team onboarding.

Backend Developer (Java) | Analytics Company/WilsonHCG (USA)

May 2022 – March 2023

  • Built web crawlers, data enrichment integrations, and search bots using microservices architecture and multithreading.
  • Managed both SQL (PostgreSQL) and NoSQL (Elasticsearch, MongoDB) databases, optimizing queries and ensuring consistency.
  • Enhanced Elasticsearch performance, refined text analyzers, and ensured data accuracy.
  • Designed and implemented asynchronous data processing pipelines.
  • Developed and executed integration tests to ensure system stability.
  • Acted as a team lead for a group of four developers, facilitating stand-ups, retrospectives, and task allocation.

Junior Java Developer | SRG Appraisal (Moscow, Russia)

August 2021 – April 2022

  • Developed applications using Java 8–17 with Spring Boot, Spring Data, and Spring Security.
  • Optimized MySQL and MongoDB database queries and improved API client integration.
  • Maintained and updated front-end components using React, Thymeleaf, and Knockout.js.
  • Automated deployment processes with Jenkins and Puppet.
  • Documented technical processes using Atlassian tools, later transitioning to JetBrains YouTrack.

Education

Kuban State Agrarian University

Bachelor’s Degree in Economics (Taxation), 2018