Full-StackDeveloper
I build professional, reliable and high-performance websites — from the database to the last pixel.
Built from scratch. Running in production.
A complete e-commerce platform — from database schema and payments to the admin panel and a lightning-fast storefront.
I create professional, reliable and high-performance websites. One developer, the whole stack — from Postgres to pixels.
Kostiantyn Naumenko
Sofia, Bulgaria
Professional, reliable and high-performance websites.
- Based in
- Sofia, Bulgaria
- Work format
- Remote · Worldwide
- Education
- TU Sofia · 2nd year
- Focus
- Websites & web apps
I'm a full-stack web developer based in Sofia, working remotely with clients worldwide. I build websites and web applications end to end and on my own: architecture, databases, payments, admin panels and fast, polished interfaces.
My standard is simple: professional, reliable and high-performance. Every project ships with clean code, secure defaults, top Lighthouse scores and a design that feels effortless.
Years in web development
Projects delivered
Lighthouse performance
In production
A modern web stack, end to end.
Tools I use daily to take websites from an empty repository to a fast, monitored production deployment.
Frontend
Interfaces that are fast, accessible and alive.
- JavaScript
- TypeScript
- React
- Next.js
- Tailwind CSS
- Motion
- HTML / CSS
Backend
APIs, auth, payments and background jobs.
- Node.js
- Server Actions
- REST APIs
- NextAuth
- Zod
- FastAPI
Data
Schemas that survive real traffic.
- PostgreSQL
- Prisma
- MySQL
- SQLite
- Redis
Infrastructure
Shipping, observing, scaling.
- Vercel
- Docker
- GitHub Actions
- S3
- Azure
- Linux
Where I've been building.
Four years of building for the web — always solo, owning every step from the first call to production.
2022 — Now
Full-Stack Web Developer · Freelance · Remote
Working solo end to end: websites, online stores and web applications for clients — architecture, design, development, deployment and long-term support.
- Next.js
- React
- Node.js
- PostgreSQL
2025 — Now
Student, Intelligent Systems & AI · Technical University of Sofia
Second-year student. Algorithms, databases and software engineering — applied directly to real web projects.
- Algorithms
- Databases
- AI
2026
Solo Full-Stack Developer · Prirodni Skarby · Freelance project
Designed, built and launched the entire platform on my own — architecture, database, online payments, delivery integration, admin panel and deployment.
- Next.js
- Prisma
- LiqPay
- Vercel
What I can build for you.
From a business website to a full platform — I take ownership from the first call to a fast, stable production.
Business Websites
Fast, SEO-ready websites that present your brand and turn visitors into clients.
Web Applications
Custom platforms with accounts, dashboards, admin panels and APIs built on Next.js.
E-commerce
Online stores with catalog, cart, payments, delivery integrations and analytics.
Performance & SEO
Audits and optimization for Core Web Vitals, accessibility and search visibility.
01
Discover
Goals, audience, constraints. A clear scope before a single line of code.
02
Design
Architecture, data model and interface — validated early, iterated fast.
03
Build
Typed, tested, reviewed. Regular previews on real URLs.
04
Launch
Deployment, monitoring, SEO and handover. Then continuous improvement.
Have a project in mind? Let's talk.
Tell me about your idea, timeline and budget. I work remotely and usually reply within a day.
Open to remote projects. Based in Sofia, Bulgaria, working remotely worldwide.