I design and build products that
deliver
real impact
Trusted by teams worldwide
Focused on latest digital innovations
Something that
stands out.
I'm highly adaptable across global time zones
Building cross-browser extensions for Chrome, Safari, Firefox & Edge with 500K+ total users across projects.
LLM integrations, RAG architectures with pgvector, and AI-accelerated workflows for production apps.
End-to-end product development with Next.js, NestJS, Supabase, and real-time WebSocket infrastructure.
Cross-platform mobile apps with React Native, real-time databases, and native device integrations.
Co-founded a dev agency on Upwork. Shipped products across fintech, health-tech, ed-tech, and Web3.
Building cross-browser extensions for Chrome, Safari, Firefox & Edge with 500K+ total users across projects.
LLM integrations, RAG architectures with pgvector, and AI-accelerated workflows for production apps.
End-to-end product development with Next.js, NestJS, Supabase, and real-time WebSocket infrastructure.
Cross-platform mobile apps with React Native, real-time databases, and native device integrations.
Co-founded a dev agency on Upwork. Shipped products across fintech, health-tech, ed-tech, and Web3.
Building cross-browser extensions for Chrome, Safari, Firefox & Edge with 500K+ total users across projects.
LLM integrations, RAG architectures with pgvector, and AI-accelerated workflows for production apps.
End-to-end product development with Next.js, NestJS, Supabase, and real-time WebSocket infrastructure.
Cross-platform mobile apps with React Native, real-time databases, and native device integrations.
Co-founded a dev agency on Upwork. Shipped products across fintech, health-tech, ed-tech, and Web3.
Building cross-browser extensions for Chrome, Safari, Firefox & Edge with 500K+ total users across projects.
LLM integrations, RAG architectures with pgvector, and AI-accelerated workflows for production apps.
End-to-end product development with Next.js, NestJS, Supabase, and real-time WebSocket infrastructure.
Cross-platform mobile apps with React Native, real-time databases, and native device integrations.
Co-founded a dev agency on Upwork. Shipped products across fintech, health-tech, ed-tech, and Web3.
Things I'm doing
Building Modern Web Apps
I'm highly adaptable across global time zones
Building cross-browser extensions for Chrome, Safari, Firefox & Edge with 500K+ total users across projects.
LLM integrations, RAG architectures with pgvector, and AI-accelerated workflows for production apps.
End-to-end product development with Next.js, NestJS, Supabase, and real-time WebSocket infrastructure.
Cross-platform mobile apps with React Native, real-time databases, and native device integrations.
Co-founded a dev agency on Upwork. Shipped products across fintech, health-tech, ed-tech, and Web3.
Building cross-browser extensions for Chrome, Safari, Firefox & Edge with 500K+ total users across projects.
LLM integrations, RAG architectures with pgvector, and AI-accelerated workflows for production apps.
End-to-end product development with Next.js, NestJS, Supabase, and real-time WebSocket infrastructure.
Cross-platform mobile apps with React Native, real-time databases, and native device integrations.
Co-founded a dev agency on Upwork. Shipped products across fintech, health-tech, ed-tech, and Web3.
Building cross-browser extensions for Chrome, Safari, Firefox & Edge with 500K+ total users across projects.
LLM integrations, RAG architectures with pgvector, and AI-accelerated workflows for production apps.
End-to-end product development with Next.js, NestJS, Supabase, and real-time WebSocket infrastructure.
Cross-platform mobile apps with React Native, real-time databases, and native device integrations.
Co-founded a dev agency on Upwork. Shipped products across fintech, health-tech, ed-tech, and Web3.
Building cross-browser extensions for Chrome, Safari, Firefox & Edge with 500K+ total users across projects.
LLM integrations, RAG architectures with pgvector, and AI-accelerated workflows for production apps.
End-to-end product development with Next.js, NestJS, Supabase, and real-time WebSocket infrastructure.
Cross-platform mobile apps with React Native, real-time databases, and native device integrations.
Co-founded a dev agency on Upwork. Shipped products across fintech, health-tech, ed-tech, and Web3.
Things I'm doing
Building Modern Web Apps
Focused on latest digital innovations
Something that
stands out.
Crafting modern experiences
VENTURE
SHOWCASE
Poppin
Browser extension that embeds prediction markets directly into any webpage. See relevant markets, place trades, and discuss outcomes without switching tabs — powered by Polymarket and Kalshi.
Zing Coach
AI-powered fitness coaching app with 1M+ users. Official partner of Paris Saint-Germain. Personalized workout plans, body composition scans, and computer vision form tracking. Full rebuild from Webflow to Next.js with 20+ pages.
Auditional
Audition tracking and management platform for 2,000+ actors with 46,000+ auditions logged. One-click import from Actors Access and Casting Networks via cross-browser extensions for Chrome, Safari, and Firefox.
ChurchBee
Modern newsletter design tool for churches — built as a Chrome extension that works inside your existing church management system. Beautiful drag-and-drop newsletters with flat pricing, unlimited sending, and BeeFree integration.
This is HCD
The independent home for Human-Centered Design changemakers. 364 episodes, free courses, learning journeys, and a global directory of 450+ designers across 130+ countries. Complete platform remake.
TrendinChat
Real-time conversations about what matters now. Join chat rooms on trending topics and discuss with thousands. Built in just two weeks with Grok AI integration.
YouNet
AI-powered platform for building next-generation business solutions with AI agents. Features a plug & play chat widget, pre-built AI agents for customer support, social media, SEO, data analysis, and more.
RateItAll
Consumer review and rating platform originally founded in 1999, revived in 2022. Rate anything — movies, songs, food, sports, actors, politicians, and more. Featured on TechCrunch, VentureBeat, PC Magazine.
Coffict
Multi-purpose coffee ordering and loyalty app connecting coffee lovers with local cafes. Order ahead with Gel-Al, earn rewards with loyalty cards, and discover campaigns — all in one app.
PastorsLine
Communication platform for churches, ministries and non-profits. Connect, capture, communicate and convert using texts, voice calls and digital automation. Cross-browser extensions for Chrome, Safari, Firefox, Edge, and Opera.
A QUICK GLANCE
Building the bridge between ideas and experiencesI'm Ugur Kellecioglu, an Upwork Top 1% freelancer with 100% Job Success Score and 5+ years turning complex technical challenges into shipped products. I specialize in Chrome extensions, full-stack web apps, and AI integrations — my extensions have served 500K+ users.
My stack runs deep: Next.js, NestJS, React Native, Supabase, PostgreSQL, and cutting-edge AI tooling (RAG, pgvector, LLM orchestration). I've co-founded a dev agency on Upwork and shipped products across fintech, health-tech, ed-tech, and Web3.
From prediction market extensions to AI fitness coaching for 1M+ users — I build things that scale. Let's work together.
MY SKILLSET
The Magic Behind- TypeScript
- React
- Next.js
- NestJS
- Node.js
- React Native
- Svelte
- Chrome Extensions
- Supabase
- PostgreSQL
- Firebase
- MongoDB
- Tailwind CSS
- Prisma
- TypeORM
- RabbitMQ
- WebSocket
- GraphQL
- Docker
- AWS
- Vercel
- Shopify/Liquid
- Nuxt
- LLM/AI Integration
- RAG/pgvector
- Solana/Web3
- Git
- Linux
THE FEEDBACK LOOP
Proof of impact from the trusted network“Ugur is an excellent full stack developer and a true professional. He delivered high-quality work using Next.js on the frontend and NestJS on the backend, with clean architecture, clear communication, and strong attention to detail throughout the project. Would absolutely work with Ugur again and highly recommend him to anyone looking for a strong full stack engineer with modern JavaScript experience!”
“Ugur completely rebuilt our game analytics platform from the ground up. Migrated PostgreSQL to ClickHouse, introduced Kafka, set up PM2, and moved infra to Hetzner. What used to crash or timeout now runs smoothly even under heavy load. He diagnosed problems quickly and knew exactly which technologies to implement without overcomplicating things.”
“Great to work with, as always. Been working with him regularly on different projects.”
“Hired Ugur to build our React Native app with Supabase backend. He shipped the iOS and Android builds ahead of schedule with real-time sync, push notifications, and clean TypeScript throughout. Exactly the mobile developer we were looking for.”
“Brought Ugur on to rebuild our SaaS dashboard from scratch with Next.js, Tailwind CSS, and a NestJS API layer. Performance improved 4x, our customers noticed immediately. He thinks like a product engineer, not just a coder.”
“Ugur built our Solana-integrated web app with wallet authentication and on-chain data display. His TypeScript and Web3 skills are solid, and he communicates clearly even on complex blockchain topics. Would hire again for any crypto project.”
“Ugur is an excellent full stack developer and a true professional. He delivered high-quality work using Next.js on the frontend and NestJS on the backend, with clean architecture, clear communication, and strong attention to detail throughout the project. Would absolutely work with Ugur again and highly recommend him to anyone looking for a strong full stack engineer with modern JavaScript experience!”
“Ugur completely rebuilt our game analytics platform from the ground up. Migrated PostgreSQL to ClickHouse, introduced Kafka, set up PM2, and moved infra to Hetzner. What used to crash or timeout now runs smoothly even under heavy load. He diagnosed problems quickly and knew exactly which technologies to implement without overcomplicating things.”
“Great to work with, as always. Been working with him regularly on different projects.”
“Hired Ugur to build our React Native app with Supabase backend. He shipped the iOS and Android builds ahead of schedule with real-time sync, push notifications, and clean TypeScript throughout. Exactly the mobile developer we were looking for.”
“Brought Ugur on to rebuild our SaaS dashboard from scratch with Next.js, Tailwind CSS, and a NestJS API layer. Performance improved 4x, our customers noticed immediately. He thinks like a product engineer, not just a coder.”
“Ugur built our Solana-integrated web app with wallet authentication and on-chain data display. His TypeScript and Web3 skills are solid, and he communicates clearly even on complex blockchain topics. Would hire again for any crypto project.”
“Ugur is an excellent full stack developer and a true professional. He delivered high-quality work using Next.js on the frontend and NestJS on the backend, with clean architecture, clear communication, and strong attention to detail throughout the project. Would absolutely work with Ugur again and highly recommend him to anyone looking for a strong full stack engineer with modern JavaScript experience!”
“Ugur completely rebuilt our game analytics platform from the ground up. Migrated PostgreSQL to ClickHouse, introduced Kafka, set up PM2, and moved infra to Hetzner. What used to crash or timeout now runs smoothly even under heavy load. He diagnosed problems quickly and knew exactly which technologies to implement without overcomplicating things.”
“Great to work with, as always. Been working with him regularly on different projects.”
“Hired Ugur to build our React Native app with Supabase backend. He shipped the iOS and Android builds ahead of schedule with real-time sync, push notifications, and clean TypeScript throughout. Exactly the mobile developer we were looking for.”
“Brought Ugur on to rebuild our SaaS dashboard from scratch with Next.js, Tailwind CSS, and a NestJS API layer. Performance improved 4x, our customers noticed immediately. He thinks like a product engineer, not just a coder.”
“Ugur built our Solana-integrated web app with wallet authentication and on-chain data display. His TypeScript and Web3 skills are solid, and he communicates clearly even on complex blockchain topics. Would hire again for any crypto project.”
“Ugur is an excellent full stack developer and a true professional. He delivered high-quality work using Next.js on the frontend and NestJS on the backend, with clean architecture, clear communication, and strong attention to detail throughout the project. Would absolutely work with Ugur again and highly recommend him to anyone looking for a strong full stack engineer with modern JavaScript experience!”
“Ugur completely rebuilt our game analytics platform from the ground up. Migrated PostgreSQL to ClickHouse, introduced Kafka, set up PM2, and moved infra to Hetzner. What used to crash or timeout now runs smoothly even under heavy load. He diagnosed problems quickly and knew exactly which technologies to implement without overcomplicating things.”
“Great to work with, as always. Been working with him regularly on different projects.”
“Hired Ugur to build our React Native app with Supabase backend. He shipped the iOS and Android builds ahead of schedule with real-time sync, push notifications, and clean TypeScript throughout. Exactly the mobile developer we were looking for.”
“Brought Ugur on to rebuild our SaaS dashboard from scratch with Next.js, Tailwind CSS, and a NestJS API layer. Performance improved 4x, our customers noticed immediately. He thinks like a product engineer, not just a coder.”
“Ugur built our Solana-integrated web app with wallet authentication and on-chain data display. His TypeScript and Web3 skills are solid, and he communicates clearly even on complex blockchain topics. Would hire again for any crypto project.”
“He got me the project back in just 48 hours (his original timeline was 7 days)! Ugur is by far one of the best freelancers I've worked with. I highly recommend.”
“Ugur delivered exactly what I needed — fast, reliable, and with great communication. The MVP was built on time, works flawlessly, and the codebase is clean and well-structured. Definitely recommended.”
“We needed a Chrome extension developer who could handle complex DOM injection and cross-origin messaging. Ugur nailed it — the extension works flawlessly across Chrome, Firefox, and Safari. His browser extension expertise is unmatched.”
“Ugur integrated RAG-based search with pgvector into our Next.js platform. The AI features he built — semantic search, auto-summarization, and smart recommendations — transformed our product. Deep knowledge of LLM APIs and vector databases.”
“As a non-technical founder, I needed a freelance developer I could trust with the entire stack. Ugur handled everything — database design, API development, frontend, deployment on Vercel. He's basically a one-man engineering team.”
“Needed a Shopify custom app with a Next.js storefront. Ugur delivered a fast, SEO-optimized headless commerce site with Liquid customizations on the admin side. Best freelancer I've found for Shopify development.”
“He got me the project back in just 48 hours (his original timeline was 7 days)! Ugur is by far one of the best freelancers I've worked with. I highly recommend.”
“Ugur delivered exactly what I needed — fast, reliable, and with great communication. The MVP was built on time, works flawlessly, and the codebase is clean and well-structured. Definitely recommended.”
“We needed a Chrome extension developer who could handle complex DOM injection and cross-origin messaging. Ugur nailed it — the extension works flawlessly across Chrome, Firefox, and Safari. His browser extension expertise is unmatched.”
“Ugur integrated RAG-based search with pgvector into our Next.js platform. The AI features he built — semantic search, auto-summarization, and smart recommendations — transformed our product. Deep knowledge of LLM APIs and vector databases.”
“As a non-technical founder, I needed a freelance developer I could trust with the entire stack. Ugur handled everything — database design, API development, frontend, deployment on Vercel. He's basically a one-man engineering team.”
“Needed a Shopify custom app with a Next.js storefront. Ugur delivered a fast, SEO-optimized headless commerce site with Liquid customizations on the admin side. Best freelancer I've found for Shopify development.”
“He got me the project back in just 48 hours (his original timeline was 7 days)! Ugur is by far one of the best freelancers I've worked with. I highly recommend.”
“Ugur delivered exactly what I needed — fast, reliable, and with great communication. The MVP was built on time, works flawlessly, and the codebase is clean and well-structured. Definitely recommended.”
“We needed a Chrome extension developer who could handle complex DOM injection and cross-origin messaging. Ugur nailed it — the extension works flawlessly across Chrome, Firefox, and Safari. His browser extension expertise is unmatched.”
“Ugur integrated RAG-based search with pgvector into our Next.js platform. The AI features he built — semantic search, auto-summarization, and smart recommendations — transformed our product. Deep knowledge of LLM APIs and vector databases.”
“As a non-technical founder, I needed a freelance developer I could trust with the entire stack. Ugur handled everything — database design, API development, frontend, deployment on Vercel. He's basically a one-man engineering team.”
“Needed a Shopify custom app with a Next.js storefront. Ugur delivered a fast, SEO-optimized headless commerce site with Liquid customizations on the admin side. Best freelancer I've found for Shopify development.”
“He got me the project back in just 48 hours (his original timeline was 7 days)! Ugur is by far one of the best freelancers I've worked with. I highly recommend.”
“Ugur delivered exactly what I needed — fast, reliable, and with great communication. The MVP was built on time, works flawlessly, and the codebase is clean and well-structured. Definitely recommended.”
“We needed a Chrome extension developer who could handle complex DOM injection and cross-origin messaging. Ugur nailed it — the extension works flawlessly across Chrome, Firefox, and Safari. His browser extension expertise is unmatched.”
“Ugur integrated RAG-based search with pgvector into our Next.js platform. The AI features he built — semantic search, auto-summarization, and smart recommendations — transformed our product. Deep knowledge of LLM APIs and vector databases.”
“As a non-technical founder, I needed a freelance developer I could trust with the entire stack. Ugur handled everything — database design, API development, frontend, deployment on Vercel. He's basically a one-man engineering team.”
“Needed a Shopify custom app with a Next.js storefront. Ugur delivered a fast, SEO-optimized headless commerce site with Liquid customizations on the admin side. Best freelancer I've found for Shopify development.”
My Site
Discover what keeps me building dailyGitHub & Open Source
Constantly contributing and building
"Can you explain React hooks?"
I'll break down hooks and create a roadmap for you!
AI Assistant
Struggling with a topic? Let AI build your roadmap.
Recent Favorite
Currently vibing with my favorite tunes. Music fuels my coding sessions and keeps the creative energy flowing.
FROM IDEA TO EXECUTION
LET'S BUILD SOMETHING REAL!
Available for full-time roles and selective freelance projects.
I focus on shipping clean, scalable web solutions that
support real users and growing products.