Mikolaj G.

Hello! I’m Mikolaj, a full stack web and mobile app developer with 5+ years of experience building production ready mobile apps, SaaS platforms, MVPs, marketplaces, admin dashboards, and AI-powered applications. I specialize in React Native, Expo, Flutter, Swift, Kotlin, Next.js, Node.js, Firebase, Supabase, PostgreSQL, Stripe, RevenueCat, and AWS. I can help you build a new product from scratch, improve an existing MVP, fix bugs, optimize performance, or prepare your app for App Store and Google Play release. What I Can Help You With 📱 Mobile App Development Cross-platform iOS and Android apps using React Native, Expo, and Flutter, with native Swift/Kotlin integrations when needed. I handle architecture, UI implementation, API integration, testing, builds, and store submission. 💻 Web Apps & Admin Panels Modern web applications, dashboards, and SaaS platforms using React, Next.js, TypeScript, and Tailwind CSS. ⚙️ Backend Development Secure and scalable APIs with Node.js, Express, NestJS, Firebase, Supabase, and PostgreSQL. I build authentication, real-time features, subscriptions, chat, notifications, and admin systems. 💳 Payments & Subscriptions Stripe, RevenueCat, in-app purchases, subscription logic, webhook handling, and payment flows for mobile and web apps. ☁️ Deployment & DevOps AWS, Docker, GitHub, CI/CD, app store deployment, production configuration, bug fixing, and performance optimization. Project Types I Work On * MVPs for startups * SaaS platforms * AI-powered mobile and web apps * Marketplaces * Chat and social apps * E-commerce platforms * Booking and on-demand service apps * Internal business tools * Admin dashboards * Subscription-based apps Why Work With Me I take ownership of the full development process, from planning and architecture to launch. I write clean, maintainable code, communicate clearly, and focus on delivering a product that is stable, scalable, and easy to continue building on. I’m especially interested in long-term projects where I can help improve the product, add new features, and support growth after launch. ✨ Let’s build something reliable, modern, and ready for real users. Feel free to reach out and tell me about your project.