Flutter | LunaONE GmbH

I co-authored the open-source Flutter packages state_queue and the Flutter Favorite sign_in_with_apple. When possible I like to get involved in the backend, where Go/gRPC are my preferred technologies, which I have deployed at scale with multiple cloud providers.

🇸🇪 Server framework for Flutter app backends

Dart, Flutter, PostgreSQL, Google Cloud

Improved the database migration engine to handle more edge cases
Added support for Dart record and container types in the client-server protocol and data storage
Created the next generation authentication module
Updated the social logins; adding JWT, passkey, and magic link support; integrated hooks for 2FA

🇩🇪 Multi-level marketing sales app

Flutter, OpenAPI, Local-First

Merged two native mobile apps (iOS & Android) into 1 shared codebase
Full offline support: all actions are possible without connection, persisted in a local database, and synced once the server can be reached again
Extended the feature set, introduced testing (with CI), and automated deployments (CD)
Added new and improved APIs via documented OpenAPI endpoints, speeding up client development and correctness
Integrated native devices features like camera, document scanning, file handling, and PDF form filling and signing

🇩🇪 Gym trainer app

Flutter, OpenAPI, Figma

Developed mobile app from scratch, on top of the web app's API
Replicated the very granular permission system on the client
Utilized feature scopes, with extensive unit and golden testing for each part
Responsible for the app releases on both stores
Implemented native plug-ins for document scanning smooth camera access

🇯🇴 Arabic language chatbot app

Flutter, Go, gRPC, Google Cloud, Figma, RevenueCat

Built MVP ready for store release within 3 months
Client provided their own tailored GTP-style LLM, whereas we were responsible for building the app according to the app design
Build Go-based backend to handle the user management, in-app subscriptions, chat history, and quotas

🇩🇪 Fitness course booking app

Flutter, OpenAPI, Sketch/Zeplin, Firebase, RevenueCat

Helped the client extend their existing app with an increasing number of whitelabels (requiring custom design and behavior)
Implemented the technical side of a new, unified design system across all apps
Added in-app subscriptions
Lead the implementation of various features

🇸🇪 Team video-conference and chat app

Flutter, Go, AWS

Readied a Flutter web based chat and video-conferencing app for release
Replaced the homegrown API with a standard Go/gRPC backend on AWS ECS to be able to horizontally scale the chat rooms and real-time notifications
Handled the integration with the video calling provider in frontend and backend

🇺🇸 Farm management app

Flutter, GitLab, CodeMagic

Support with "AppOps" tasks (CI, Flutter upgrades, native plug-ins)
Set up CI on GitLab and CD with CodeMagic

🇩🇪 Fashion e-commerce app

Flutter, Go, gRPC, AWS

Rebuild existing ReactNative app in Flutter

4.2 → 4.8 ⭐️ average app store reviews with similar functionality due to improved performance and stability

Built app-specific backend in Go to optimize for mobile latency (ideally 1 request per page)

Built atop gRPC for maximum performance and its support in being fully backwards compatible with older versions

Added in-depth monitoring (FE: Sentry, BE: NewRelic) and custom app-specific scaling scripts for AWS ECS/Fargate

Full-stack mobile app developer working exclusively with Flutter since 2019.