Tomas M.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Aug 8, 2026.

Senior mobile and full-stack developer with 25+ years of experience building production-grade web and mobile applications. I specialize in React, React Native/Expo, TypeScript, Next.js, and Node.js on the frontend and backend, with deep hands-on experience in Supabase/PostgreSQL and Firebase/Firestore for data and auth. On the mobile side, I led the migration of a real-world offline-first delivery app from Xamarin to React Native — handling state management with MobX, CI/CD pipelines via CircleCI and Fastlane, and full app store deployment for both iOS and Android. On the web side, I've built and maintained large-scale multi-tenant platforms with monorepo architectures serving hundreds of white-label clients across separate web, admin, and customer-facing apps. I've also carried engineering leadership responsibilities — managing teams of up to five developers, establishing PR workflows (video demos required, bug fixes paired with reproducing tests), and owning CI/CD infrastructure on GitHub Actions and CircleCI. I take on contract work only, I communicate clearly, and I don't disappear mid-project. If you need someone who can own a feature end-to-end — schema design, backend logic, frontend integration, and deployment — I'm the person.