Built financial workflows and AI-powered automation for accounting professionals. Led a frontend redesign and developed backend services, background jobs and LLM integrations.
2021 — 2026Full-stack engineer / Prague, Czech Republic
I build
thoughtful
software.
I’m Serhii Melnykov, a senior full-stack JavaScript engineer with 13+ years of experience building scalable web products with React, Node.js and TypeScript.
Explore selected work01 / EXPERIENCE
Selected work across product, frontend and backend engineering.
Selected work.
03 PROJECTS
Built the customer ordering application and restaurant dashboard for a digital ordering platform, with a focus on responsive, real-time experiences.
2020 — 2021
Helped modernize a B2B travel platform through a design system, reusable component library, GraphQL migration and React architecture improvements.
2019 — 202102 / EXPERTISE
The tools and disciplines behind the work.
What I do.
Frontend
React / Next.js
TypeScript
Design systems
Responsive interfaces
Backend
Node.js / NestJS
REST / GraphQL
MongoDB / Redis
Background jobs
Systems
Product architecture
Docker / CI/CD
Performance
Technical debt
AI integration
LLM workflows
Prompt engineering
Vector databases
Production features
03 / ABOUT
How I approach the work.
Technology is most useful when it makes difficult work feel simple.
I work across the full product lifecycle — from a first interface and component system to reliable backend services. I value clear thinking, durable systems and collaborative teams.
04 / CONTACT
Have something in mind?