Hi, I'm
Tomasz
Marzeion
Lead Flutter Engineer
10 years building high-impact mobile applications across healthcare, fintech, and edtech. I lead teams, own architecture, and ship products used by millions of people.
About Me
Senior Flutter Developer with 7 years of dedicated experience building cross-platform applications for Android, iOS, Web, Windows, and macOS. Started with native Android in 2016 and moved to Flutter as the ecosystem matured — never looked back.
I've taken on Team Lead roles at multiple companies, combining hands-on engineering with architecture ownership, code reviews, and end-to-end CI/CD. My work spans healthcare platforms, fintech apps, retail tools, and EdTech products — many serving hundreds of thousands to millions of users.
I write clean, testable code, care deeply about delivery pipelines, and believe good architecture is invisible when it's working.
Experience
Flutter
Served
Delivered
Experience
Flutter — 7 years
Flutter Team Lead
DrAnsayLed a team of Flutter developers on a top-performing cannabis retail application in Germany. Combined hands-on development with ownership of mobile architecture and continuous delivery practices.
Flutter Team Lead
EleksLed end-to-end development of a mobile money transfer app (akin to Revolut) for a French client — built from scratch, architecting the entire iOS and Android codebase.
Senior Flutter Developer
Idego GroupImplemented a cross-platform retail management application for a Swedish client, available on iOS, Android, and the web.
Flutter Team Lead
GoStudentFlutter Team Lead for cross-platform (mobile + desktop) apps at a globally recognized EdTech company serving 500K+ users. Led development, contributed hands-on to the codebase, and architected solutions with end-to-end CI/CD.
Flutter Consultant Part-time
AAreteDeveloped a mobile banking application for a leading UK bank, achieving millions of downloads across iOS and Android. Key contributions included biometric verification implementation.
Flutter Developer
Sii PolandDeveloped and deployed Sweden's largest mobile healthcare application — enabling appointment scheduling, video consultations, lab result access, and prescription renewals.
Flutter Developer Part-time
VocalyBuilt an AI-driven singing learning app that analyzes vocal input and provides real-time feedback on pitch and technique.
Android — 4 years
Android Developer
SPEEDNETEngineered Android applications including a flagship mobile app for a leading Polish bank with millions of active users.
Android Developer
InsalgoDeveloped and enhanced Android applications for an international client base.
Android Developer
SolDeveloBuilt multiple components for the OpenMRS healthcare platform: a Spring-based REST API, an Angular web app, and an Android mobile app.
Skills & Tech
Frameworks
Languages
State Management
Testing
DevOps & CI/CD
Firebase
Storage & Networking
Platforms
AI Tools
Animations
Monitoring & Analytics
Device & Platform APIs
Let's Work Together
Open to remote full-time positions and freelance / contract projects.