A selection of projects I have designed, built, or co-founded — from custom poster shops to digital presences for the construction industry.
_01
The shared account for groups without a legal form.
Banks usually only open an account in a group's name for registered associations. Noah is the joint account for everyone else — school classes, sports teams and clubs: the money belongs to the group, not to one member who is personally liable. I co-founded Noah in 2026 together with Fabian and Luis and build the product end-to-end: a Kotlin and Ktor backend, React Router for the web and admin apps, and native Android and iOS apps that share their domain logic and API contracts through Kotlin Multiplatform.
Visit site ↗
_02
Turn your favorite songs into personalized posters.
artwerk is a passion project I co-founded with two friends: turn a favorite song into a personalized poster, watch the live preview build in seconds, get it printed on premium paper in an environmentally friendly process. Built on Next.js with Medusa as the headless commerce backend. As a co-founder I leaned hardest into the technical build, but all three of us were hands-on across the whole thing — product, design, business, no strict lanes. Sales have since been discontinued; the site stays online as a showcase of what we built.
Visit site ↗
_03
Digital presence for a construction project management company.
Kirchmaier & Staudacher is a project management company for construction and real estate development. I built their digital presence solo, on Svelte — design worked out closely with the client, frontend and deployment entirely my own.
Visit site ↗
_04
Smaller things I build for myself — mostly open experiments living on GitHub.
Tells you what to ride today — and builds the loop for it.
A training companion for gravel and road bikes. Your watch's resting heart rate, HRV and sleep become a daily readiness score, the plan says what's due, and Trailscape builds a matching loop from your front door. Crash-safe GPS recording, Bluetooth sensors, offline maps — local-first, no account, no subscription.
A bean memory with dial-in helper for home espresso.
Bought a bean again after a year? The recipe and grind setting are right there. Drops keeps your beans with roast date and freshness, logs dial-in attempts and saves the good one as the bean's recipe. A Kotlin Multiplatform app with an optional Ktor sync server — fully offline without an account.
A retro pixel reaction game — one tap decides.
A dot circles a track; tap while it crosses the green zone, hit the bright center for PERFECT streaks. Rising scores unlock twists like pulsing, drifting and chained zones. Daily challenge, unlockable skins, a Wear OS companion — everything drawn in code, no assets.
Your coding agent's sessions, in your pocket.
A native Android remote for pi, the coding agent on my Mac. Pair by QR code, follow sessions and subagents live, reply with text, voice, photos or files, and get a push when the agent finishes or has a question. A Wear OS app brings it to the wrist; everything is end-to-end encrypted.
A troll platformer where the devil deals the traps.
Bevel, a tiny data packet, just wants to reach the door, and Mephi, the croupier of hell, deals a trap card against him at every step. 144 levels descend from a hellish basement through a data center down to the circuit board. Hell-CRT pixel look, synthesized sound, an 80 KB APK.
Tap. Dodge. Fly through — a one-finger arcade flyer in 3D.
A low-poly 3D arcade flyer: tap to flap, swipe to switch between three lanes, each with its own gap in the pipes. Gaps shrink and move, cacti pop out in time with the music, zones change as you go. Kotlin Multiplatform with a hand-written OpenGL ES renderer.
Mini Metro, but you're wiring the internet.
Devices request services, you lay the cables, from ISDN to fiber, and keep bandwidth and ping in check while excavators cut your lines and servers overload. Five sceneries from the late '90s to 2030 on an isometric map, rendered in Kotlin with OpenGL ES, no game engine.
