Technical Team Lead Native Apps · Berlin, Germany · Dad of a 2.7-year-old 👶
"It is not the answer that enlightens, but the question." — Eugène Ionesco
I lead native app development at CHECK24 Profis, building products that millions rely on. By day I architect iOS and Android applications; by night I tinker with open-source tools that make developers' lives easier.
🏗️ Architecture — setting projects up to grow in the right direction
🤖 AI-augmented automation — CI/CD, AI agents, MCP tooling, anything that removes toil
🔭 Observability — making the invisible visible, from app size to team velocity
🛠️ Developer experience — tools that make devs faster, happier, less frustrated
⚡ Startup & performance — cold start times, first frame, min-maxing every millisecond and byte
🏠 Self-hosting — owning your stack, avoiding vendor lock-in, staying independent
🎬 Media & graphics — codecs, OpenGL, 360° video, hardware acceleration
🧠 Semantic meaning in data — statistics, patterns, insights that tell a story
📡 Device sensors — accelerometers, gyroscopes, cameras, the real world as input
Multiply impact through people. Own outcomes, not just code.
🧭 Be strategic — Align what we build today with where we're going tomorrow.
📈 Be a multiplier — Grow people's capabilities and watch the team's impact scale exponentially.
💬 Be clear — Bridge the gap between technical depth and business reality.
🎯 Be pragmatic — Ship smart, iterate fast. Perfect later, working now.
🚧 Be present — Remove blockers before they become problems worth talking about.
🤝 Be trusting — Autonomy isn't risky with experienced people, it's required.
🛡️ Be safe — Smart risks and honest conversations build the kind of teams that win.
🔧 Be credible — Stay close enough to the code to make decisions grounded in reality.
⭐ Be exemplary — Model the rigor and curiosity you want to see spread.
🙏 Be humble — The best ideas come from listening, not knowing everything first.
- Proxy your Android emulator and iOS simulator to your local Docker stack — Sep 24, 2026
- The Hidden .github Repository: Remove Duplicate Files Across GitHub — Aug 13, 2026
- Your AI Coding Agent Uses Your Terminal’s Tools. Give It Better Ones. — Jul 10, 2026
- Two Paths to Local LLM Servers: Windows NVIDIA vs Mac Apple Silicon — Apr 20, 2026
- One await to Rule Them All: A Unified WebView Bridge for Android and iOS — Mar 11, 2026
- Trail: A Self-Hosted Micro Link Journal for People Who Miss Chronological Feeds — Mar 04, 2026
- Trail for Android: A Native Client for Your Self-Hosted Link Journal — Mar 04, 2026
- I Built a Skill Tree for My Baby (Because Parenting Is Basically an RPG) — Feb 09, 2026
- Building a Production-Ready Stale Branch Bot for Jenkins: Lessons from the Trenches — Jan 28, 2026
- Git Panorama: Mapping Your Team’s Codebase Journey — Dec 23, 2025
A decade of building things that scratch my own itch.
See what's happening. Make better decisions.
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Answer "who works on what?" Self-hosted git analytics with Grafana dashboards. Team visibility without SaaS.
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iOS app size analyzer. LinkMap parsing, asset tracking, module ownership. Know where your bytes go.
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Gradle plugin for Android app size analysis.
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Self-hosted backend for side projects. Key/value store + Event API + Admin dashboard. One PHP file.
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Track which iOS versions your users are on. Plan your minimum deployment target.
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Same for Android. The fragmentation is real — stay informed.
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Browse and filter GitHub repositories with smart filters. Public/private, forks/sources, archived — find what you need fast.
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Foundations that scale. Decisions that compound.
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Coroutine-based dependency initialization orchestrator. App startup, but make it parallel.
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Borg's iOS sibling. Dependency initialization like androidx.startup, but for Swift.
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Timber-style logging for iOS. Beautiful, structured logs with minimal setup.
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Lightweight service locator pattern for iOS. Centralized object creation, decoupled dependencies.
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Tags and removes stale git branches. Keep your repos clean, automatically.
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Less boilerplate, more shipping.
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Animated splash screens that don't suck. Jetpack Compose + AndroidX SplashScreen, done right.
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Location tracking & geofencing that actually works. Background, killed app, device reboot — it survives.
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Kotlin extensions for Android resources.
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Bidirectional native ↔ WebView bridge. JSON messages, type-safe, no JavaScript injection hacks.
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Hardware-accelerated video transcoding. Surprisingly fast, battery-friendly.
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Fully styleable compass widget. Magnetometer → beautiful UI.
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Web UI for ADB commands. Tune performance, manage apps, no command line needed.
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Send Firebase push notifications from AI assistants. Claude can ping your phone now.
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RecyclerView adapter library with different models and layouts as convenient as possible.
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Clean media player implementation. Audio/video playback without the cruft.
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Native OpenGLES 2.0 360° video player. Immersive content without third-party SDKs.
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Sequential image player for smooth frame-by-frame animations.
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Retrieve Android application and current activity from anywhere.
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Network logging interceptor for OkHttp with encoded URL sharing.
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Side projects for fun and exploration.
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QR scanner that shows raw bytes before you click. See what's actually encoded.
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Water temperature app for Berlin's Schlachtensee. Real-time lake conditions.
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Library and app for showing tons of device information for your Android device.
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Projects that served their purpose — preserved for reference and nostalgia.
These are archived public repositories where I've contributed code. Some are original projects, others are forks where I've made modifications.
Utilities, extensions, and helpers for Android development.
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Measures human heart rate using camera and flash light.
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Smoothen RxJava value streams for sensor data using Kalman filter.
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Flexible logger with multiple output targets.
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Simple PGP encryption/decryption on Android.
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Kotlin library which shortens URLs.
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Stops app usage after a period of time has passed from build date.
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Tiny tracking library for Google Analytics.
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Custom ViewPager that allows blocking left or right swipe gestures.
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Common Android UI utilities.
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Project-wide handling of tested and used libraries.
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Android XML animations collection.
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Collection of reusable Android functions.
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SDK for detecting Android ANR (Application Not Responding).
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A beautiful, slim Android ProgressBar.
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Listen to download/upload progress in OkHttp, compatible with Retrofit and Glide.
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Check the current uploaded version on Google Play.
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Android Debug Drawer for faster development.
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Simple pinch-to-zoom ImageView library for Android.
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Actions for Android animations, inspired by libgdx scene2d actions.
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Animation effects for text, not really a TextView.
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Video, OpenGL, and visual processing projects.
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Parallax scrolling either by offset or automatically.
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On-device extracting images from videos and creating video from images.
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Android filters based on OpenGL (idea from GPUImage for iOS).
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Fast seek for ExoPlayer.
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Image and video gallery for Android.
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Sample glTF renderer for Android.
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Android port of jgltfViewer with native OpenGL ES bindings.
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Game development experiments and prototypes.
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Strategy game built with Unity.
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Interpolation test with easing, beziers, and catmull-rom splines.
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Voronoi graph demo project for Unity.
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Playing with Perlin noise generation.
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Conway's Game of Life implementation.
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Neural networks meet evolutionary algorithm.
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RogueLike cave generation code.
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Flappy Bird clone tutorial project.
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Drag and Slay game sequel.
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Hack and Slay game for Android (media project).
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GTA multiplayer clone for Android (media project).
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Academic and educational projects from earlier days.
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Programming 1 & 2 Tutorium 2011-2012.
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Computer Graphics 1 raytracer.
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Computer Graphics 2 WebGL exercises.
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CG1 Rasterizer project.
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Project Euler progress.
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Elective C++ course.
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Random experiments and sandbox projects.
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Showing explosions on mouse cursor over webcam stream.
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KittySpin for September MiniGameJam.
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Shows realtime gamma radiation measurements of Berlin.
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Adapter for managing a single WebView by bottom navigation.
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MagicMirror² module to display any web content.
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Video streaming experiments.
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ChatGPT app with Jetpack Compose, Room, Retrofit.
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Playground app for Constraint Layout Flow.
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These projects are archived but remain available for reference. PRs are generally not accepted, but feel free to fork!
I'm always happy to chat about native development, team leadership, or just swap war stories about debugging obscure platform issues.