Open to opportunities

Andrew Buhayov

@andrewbuhayov

Message

I build scalable Node.js backends, microservices, and AI-powered SaaS features for production.

Ukraine

Message

What I'm looking for

I'm looking to build scalable, maintainable backend and AI-powered systems, owning work from architecture through production while solving practical business problems.

I've delivered 5+ web products at Capptoo AG, owning architecture, development, deployment, and production support across teams of 1 to 8 engineers.

I scale high-load Node.js and TypeScript systems through database optimization, caching, asynchronous processing, and traffic distribution, supporting more than 100,000 requests per day. I've also decomposed monoliths into microservices and event-driven architectures, reducing release cycles from hours to under 15 minutes.

I build practical AI backend features, including RAG pipelines, AI agents, document processing, vector search, TTS, and STT. My work has automated manual workflows across 10,000+ documents and requests.

Previously at Techstack Ltd, I maintained and extended legacy full-stack applications, built web scrapers and data-processing tools, and delivered across multiple client projects. I combine hands-on engineering with system design, DevOps, code reviews, mentoring, and production ownership.

Experience

Work history, roles, and key accomplishments

Current

Senior Backend Engineer

Current

Capptoo AG

Mar 2022 - Present (4 years 6 months)

Delivered 5+ web products end-to-end, scaling backend systems to support 100,000+ requests per day. Decomposed monoliths into microservices and event-driven architectures, and built AI-powered features including RAG pipelines and AI agents.