About Oleksandr
I help startups and engineering teams build scalable, high-performance web platforms and backend systems using Python and modern cloud-native technologies.
As a Senior Full Stack Software Developer, I specialize in backend architecture, API development, distributed systems, modern frontend applications, automation infrastructure, and DevOps workflows.
Over the years, I’ve worked with startups and fast-growing companies to design production-ready systems, modernize legacy architectures, improve platform reliability, and accelerate software delivery. I focus on building clean, maintainable, and scalable engineering solutions that support long-term product growth.
What I can help with:
• Full stack web application development
• Backend development with Python, FastAPI, Django, Flask, and REST APIs
• Frontend development with React, TypeScript, JavaScript, and modern UI architectures
• API integrations, microservices, and scalable distributed systems
• Cloud-native infrastructure and Dockerized environments
• CI/CD pipelines using GitHub Actions and GitLab CI/CD
• Database architecture and optimization with PostgreSQL and SQL
• Automation platforms, internal tools, and developer productivity systems
• Performance optimization, scalability improvements, and platform reliability
• Technical architecture, code quality, and engineering best practices
Core technologies:
Python, FastAPI, Django, Flask, React, TypeScript, JavaScript, Docker, GitHub Actions, GitLab CI/CD, PostgreSQL, SQL, Linux, AWS, REST APIs, Microservices
Remote-first across Europe.
Available for long-term freelance collaborations and product engineering projects.
English
Native or bilingual
Ukrainian
Native or bilingual
Remote only
Primarily works remotely
Experience
- IntellectEUQuality Assurance EngineerMarch 2023 - Today (3 years and 3 months)Implemented test cases for web and API layers of internal and client facing applications Programmed functional and regression scenarios using Python (Pytest, requests), Playwright, Java, Selenide, and RESTAssured Built and integrated a test automation framework into CI/CD pipelines using AWS CodeBuild and GitLab CI Conducted requirement analysis, test design, test data preparation, and environment setup Engaged in sprint planning and design reviews to ensure testability and early QA involvement Maintain test infrastructure and troubleshoot to ensure automation stability Supported exploratory and manual testing of newfeatures prior to releaseLangflow, Prompt-based QA validation, Certified in AI Engineering (IBM); tested LLM driven workflows and AI pipelines in Langflow-based systems, Attention to detail, Analytical thinking, Communication, Teamwork, Time management, Problem-solving, AdaptabilityDeveloped and upheld UI test automation using Java, Selenide, Cucumber, TestNG/JUnit, Gradle/Maven Led design and implementation of REST API test automation using REST Assured and Postman, achieving 95% endpoint coverage and reducing bug leakage rate Integrated test execution into CI pipelines using Jenkins and GitLab CI Actively supported refactoring and stabilization of test suites Provided test result reporting and visualization using Allure
- Group BWTQuality Assurance Test EngineerNovember 2020 - February 2023 (2 years and 3 months)Developed and upheld UI test automation using Java, Selenide,Cucumber, TestNG/JUnit, Gradle/MavenLed design and implementation of REST API test automation using RESTAssured and Postman, achieving 95% endpoint coverage and reducingbug leakage rateIntegrated test execution into CI pipelines using Jenkins and GitLab CIActively supported refactoring and stabilization of test suitesProvided test result reporting and visualization using Allure
- Bineks.netQA EngineerMarch 2015 - October 2020 (5 years and 7 months)Created and performed manual test cases based on business and technical requirements Logged, tracked, and verified defects using Redmine and direct developer communication Supported functional, usability, and regression testing across multiple releases Stable structured test documentation and retesting provided for fixed issues Took part in requirements clarification and improvement of QA processes in a small cross-functional team
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Education
- IBM AI EngineeringIBM2026
- Generative AI EngineeringIBM2026
Certifications
- Machine Learning with PythonIBM2026
- Generative AI: Prompt Engineering BasicsIBM2026