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Uğur KellecioğluUK

Uğur Kellecioğlu

Fullstack Engineer

€400/day
Ankara, TR
3-7 years

Average response time: 1 hour

About Uğur

Full-Stack Development | Next.js/NestJS | AI Integration | Production Apps
$50.00/hr

✅ 5+ Years Building Production-Grade Apps
☑️ CTO & Co-Founder | 4K+ Users, 30K+ Waitlist
🎯 Cloud-Deployed, Scalable, AI-Powered

Invite me to your project or message me. Accepting new projects.

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What I Deliver:

1️⃣ Full-Stack Applications - Next.js, NestJS, React Native, TypeScript, PostgreSQL. Production apps with real users, cloud-deployed and scaling.

2️⃣ Backend Architecture - NestJS, PostgreSQL, Supabase, Firebase, RabbitMQ, Redis. Microservices, RESTful APIs, GraphQL, real-time systems. Serverless and serverfull.

3️⃣ AI Integration - AI-accelerated development with Claude, Cursor, Gemini. LLM integration, chatbots, RAG pipelines, vector databases (Pinecone, Weaviate).

4️⃣ SaaS Platforms - Cloud-native apps with auth, Stripe payments, analytics, monitoring. AWS, Vercel, Firebase deployments.

5️⃣ Chrome Extensions - Browser extensions with real-time features when needed.

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Hi! 👋 I'm Ugur.

I build production-ready applications that handle real users and real business requirements.

As CTO of Poppin, I've scaled a platform to 4,000+ active users and 30,000-person waitlist—cloud-deployed, production-hardened systems built from scratch.

I combine enterprise-level expertise with startup execution speed. Battle-tested architectures and code that scales.

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Tech Stack:

Frontend: React, Next.js 14+, React Native, TypeScript, Tailwind CSS, shadcn/ui
Backend: NestJS, Node.js, Express, GraphQL, tRPC, WebSocket
Database: PostgreSQL, Supabase, Firebase, Prisma, Redis, Vector DBs
Infrastructure: RabbitMQ, AWS, Vercel, Docker, Serverless, CI/CD
AI: Claude API, OpenAI, Gemini, LangChain, RAG, Pinecone, Weaviate
  • English

    Native or bilingual

Remote only
Primarily works remotely

Experience

  • Poppin
    Co-Founder & CTO
    April 2024 - Today (2 years and 2 months)
    • ● Leading end-to-end front-end, backend and full-stack development of a Chrome extension that adds real-time social features to any webpage as the social layer of Solana, growing to 4,000+ users
    • ● Built data-intensive, streaming interfaces with real-time chat, presence tracking, and content extraction using modern web technologies
    • ● Collaborated cross-functionally with CEO and CPO to deliver delightful user experiences
    • ●
    Next.js JavaScript RabbitMQ NestJs PostgreSQL
  • Freelance
    Freelance Full Stack Software Engineer
    September 2023 - Today (2 years and 9 months)
    • ● Specialized in delivering scalable SaaS solutions, maintained web applications, developed cross-platform browser extensions, mentored two junior developers across projects, and collaborated with over 80 clients.
    • ● Top Rated on Upwork, achieved a 100% Job Success Score, placing in the top 1% of freelancers globally.
    Next.js Typescript Supabase
  • Inisev
    Remote Frontend Engineer
    September 2022 - September 2023 (1 year)
    Qormi (Citta' Pinto), Malta
    • ● Implemented advanced SEO strategies and indexing logic to ensure web applications were highly optimized for Google Search, resulting in a 41% increase in organic traffic and improved search engine rankings.
    • ● Established coding standards, branching strategies, and development workflows to ensure the project remained scalable, maintainable, and efficient.
    • ● Implemented end-to-end testing, increasing test coverage by 30%.

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Education

  • Bachelor of Computer Engineering
    TED University
    2024

Skill set

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