Alexandr Klymenko
@alexandrklymenko
Senior software engineer specializing in scalable full‑stack systems, React, TypeScript, and performance optimization.
UkraineWhat I'm looking for
I am a results-driven senior software engineer with 9+ years building scalable, high-performance full-stack applications for high-volume e-commerce and event platforms.
I design modular, maintainable frontend architectures using React and TypeScript, integrate GraphQL and REST APIs, and optimize PostgreSQL and caching strategies to improve latency and throughput.
I have delivered blockchain-powered ticketing solutions and large-scale shopping systems, reduced regressions through automated testing, and mentored engineering teams to raise code quality and delivery speed.
I focus on practical, high-impact software that solves real-world problems, emphasizes cross-device user experience, and promotes proactive problem-solving and maintainable workflows.
Experience
Work history, roles, and key accomplishments
Senior Software Engineer
Celebratix
Nov 2023 - Sep 2025 (1 year 10 months)
Engineered React and TypeScript frontend components for a blockchain-powered ticketing platform, reducing regressions by 40% and decreasing ticket retrieval latency by 35% through GraphQL integration and PostgreSQL indexing improvements.
ZADeveloped scalable React and TypeScript web applications for high-volume e-commerce, reducing backend response times by 30% and increasing throughput by 25% via GraphQL/REST enhancements and PostgreSQL caching.
GOContributed Node.js microservices to a high-performance ad-serving platform processing billions of requests daily, reducing analytics query latency by 20% and improving system reliability under peak load.
GOBuilt internal developer tools and frontend modules with JavaScript and React, improving large-scale project build efficiency by 15% and supporting backend API integrations for experimental systems.
Education
Degrees, certifications, and relevant coursework
Kharkiv National University of Radioelectronics
Bachelor of Science, Computer Science
2011 - 2015
Completed a Bachelor of Computer Science program focused on software engineering fundamentals, algorithms, and systems from 2011 to 2015.
Tech stack
Software and tools used professionally
Availability
Location
UkraineAuthorized to work in
Job categories
Skills
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