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Serhii Kovalov

@serhiikovalov

Full-stack developer specializing in scalable SaaS and blockchain e-commerce solutions.

France
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What I'm looking for

I seek a role building scalable, production-ready SaaS or Web3 systems where I can lead architecture, improve reliability, and mentor engineers.

I 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.

Experience

Work history, roles, and key accomplishments

LE

Co-Founder

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.

CO

Back-End Engineer

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.

Education

Degrees, certifications, and relevant coursework

TU

Taurida National University

Bachelor in Computer Science, Computer Science

2018 - 2019

Completed a Bachelor in Computer Science program during 2018–2019.

SU

Sevastopol National Technical University

Bachelor in Computer Science, Computer Science

2013 - 2017

Completed a Bachelor in Computer Science focusing on core computer science principles and software development.

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Serhii Kovalov - Full-Stack Engineer - Skello | Himalayas