Timm Preetz
Freelance Full-Stack Software Developer at LunaONE GmbH
Munich, Bavaria, Germany
Summary
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RockstarTimm Preetz is a freelance full-stack software developer based in Munich with 17 years of experience building mobile and web systems across startups and product teams. He blends backend framework work (notably contributions to the Serverpod ecosystem) with native mobile expertise, having implemented Sign in with Apple flows and complex chat UI/UX features. As a senior engineer he has shipped cross-platform apps for companies like ABOUT YOU, MySports and Goodgame, and recently prototyped conversational features for Mawdoo3. Comfortable across frontend, backend and native iOS integrations, he often bridges platform gaps and improves session/auth flows and offline-friendly interfaces. Colleagues rely on him for pragmatic refactors and dependency modernizations that reduce technical debt while enabling new product features.
17 years of coding experience
10 years of employment as a software developer
Stackoverflow
2,652reputation
127kreached
11answers
23questions
npm
top-5%
Github Skills (23)
ios10
flutter-apps10
user-authentication10
authentication10
chat10
front-end-development10
swift10
flutter-game10
dart10
chat-application10
flutter10
back-end-development9
npm9
emberjs9
backend9
Programming languages (23)
Github contributions (5)
aboutyou/dart_packages
Oct 2019 - Dec 2022
Dart and Flutter plugins maintained and used by @ABOUTYOU
Role in this project:
Mobile Developer (iOS)
Mobile Developer (iOS)Contributions:8 releases, 85 reviews, 304 commits in 3 years 2 months
Contributions summary:Timm primarily focused on developing the Sign in with Apple functionality for the Flutter-based mobile application. They implemented the UI button, integrated the native platform interface for iOS, and built out the authorization flow. Key contributions involved handling authentication requests, including the retrieval of credentials and integration with web-based flows. They also added the capability to retrieve the identity token and authorization code.
dartflutter-plugin
serverpod/serverpod
Dec 2021 - Jan 2022
Serverpod is a next-generation app and web server, explicitly built for the Flutter and Dart ecosystem.
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:677 reviews, 6 commits, 151 PRs in 14 days
Contributions summary:Timm primarily contributed to the development of the `serverpod_chat` module, adding features to the Flutter-based chat interface. This included implementing the functionality to display widgets on top of chat messages and support for unread message indicators. The user also made changes to session management and authentication key storage, along with general refactoring and dependency updates, showcasing their involvement across both frontend and backend aspects of the project.
dartflutterserverpodwebserver
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