Dawid Zieliński | FullstackDev
From: Poland
Location: Mikołów
On Useme since 20 June 2026
About me
I am a fullstack developer specializing in web applications, CRM systems, business websites and Unity game development. I mainly work with React, TypeScript, Node.js, PostgreSQL/Supabase and REST API, while in game development I use Unity, C#, PlayFab and online integrations. I handle projects end to end: from understanding requirements and defining the scope, through implementation, to deployment, testing and further development.
I have completed over 70 freelance projects, built more than 20 websites and web applications, and published 5 mobile games on Google Play and the App Store with over 100,000 total downloads. I focus on clear communication, practical solutions and code that can be safely extended. I also use AI tools in my development workflow, while keeping full control over quality, security and correctness.
Categories
Portfolio
Full-Stack E-Commerce Platform Built from Scratch: React, TypeScript, and PostgreSQL.
A complete production-ready online store featuring shopping cart functionality, order management, InPost API integration, an admin dashboard, PL/EN international
Koru Movement physiotherapy clinic website built with React, TypeScript, and Tailwind CSS. Includes 8 pages, prerendered SEO, Supabase integration, JSON-LD, responsive design, animations, and microinteractions.
Apartment Booking Platform for Kraków – React, TypeScript, PostgreSQL
A modern apartment reservation platform featuring advanced search and filtering capabilities, dynamically generated district pages, a seasonal pricing management system, iCal
Modern online store for cycling apparel. Responsive design, intuitive shopping cart, admin panel for product management, and SEO optimization. Built with React and TypeScript — fast, secure, and ready to sell 24/7.