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@serhiikovalov
Full-stack developer specializing in scalable SaaS and blockchain e-commerce solutions.
FranceI am a full-stack software developer with over 8 years of hands-on experience building scalable SaaS and blockchain e-commerce products using JavaScript, Python, and Go. I design and implement robust back-end and front-end systems, migrate monoliths to microservices, and build event-driven architectures that handle massive data flows.
My work spans startups and agencies where I shipped high-throughput web applications, improved test coverage by 70%, and led teams to enhance performance and reliability—achieving threefold performance improvements and 99.99% uptime for legacy platforms.
I have experience with AWS, S3-compatible and Web3 storage, Stripe billing integrations, TDD, and mentoring developers. I focus on delivering production-ready features, secure APIs, and architectures that scale for enterprise usage.
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Work history, roles, and key accomplishments
Skello
Dec 2024 - Jul 2025 (7 months)
Owned back-end and front-end development, led migration from a monolith to microservices, and built event-driven solutions (Kinesis, SQS) on AWS to handle massive data loads.
LearnLenny
Jul 2023 - Dec 2024 (1 year 5 months)
Built and maintained back-end and front-end of an AI learning platform, delivering core features and platform stability during product development.
Outsight.ai
Oct 2023 - Nov 2024 (1 year 1 month)
Delivered web features for high-volume spatial surveillance applications, applied TDD and event-driven patterns to process massive people-flow data reliably.
Coldstack/Petabox
Nov 2021 - Jul 2023 (1 year 8 months)
Developed secure web APIs and S3-compatible Web3 storage features, maintained finance modules (billing via Stripe and Web3) and contributed to product architecture.
JetRuby Agency
May 2019 - Sep 2021 (2 years 4 months)
Supported and developed e-commerce SaaS products, improved performance and reliability (3x performance gain, 99.99% uptime) and mentored junior developers while leading a team of three.
Constant Solutions
Jan 2017 - Apr 2019 (2 years 3 months)
Built and maintained modules for cryptocurrency exchange solutions, focusing on communication modules (chats, WebSockets, bots) and internal CRM integrations.
Degrees, certifications, and relevant coursework
Bachelor in Computer Science, Computer Science
2018 - 2019
Completed a Bachelor in Computer Science program during 2018–2019.
Bachelor in Computer Science, Computer Science
2013 - 2017
Completed a Bachelor in Computer Science focusing on core computer science principles and software development.
Software and tools used professionally
FranceYou can contact Serhii and 90k+ other talented remote workers on Himalayas.
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