Le Quest
Daily challenges in a city of your choice that nudge you to explore new places and meet like-minded people. Built to push complex KMP — Apple Maps on iOS, Google Maps on Android, Supabase + Room (KMP) for data.
GitHub
Available for freelance work
Native Android,
built end‑to‑end.
Passionate freelance Android developer based in Vienna. Building native apps since 2017 — and lately shipping shared iOS + Android code with Kotlin Multiplatform.
Vienna, Austria
8+
Years shipping Android
13
Apps & projects
KMP
iOS + Android, shared
MSc
Visual Computing, 2022
// Client work
Apps I've shipped for clients
A selection of production apps across health, fitness, media and gaming — built natively in Kotlin.
Client
Gaming · Entertainment
win2day
Official app of the Austrian Lotteries & Casinos Austria — the country's licensed online gaming platform.
Visit
Client
Sports betting
win2day SPORTS
Companion win2day app dedicated to live sports betting.
Visit
Client
Lottery · Services
Österreichische Lotterien
Official app of the Austrian Lotteries GmbH for tickets, results and services.
Visit
Client
Kids · Media
ORF KIDS
Official app of the ORF (Austrian national broadcaster) channel for children.
Visit
Client
Audio · Media
ORF SOUND
Bundles all audio programs of Austrian public radio in one place.
Visit
Client
Health · Fitness
TRAIN.RED
Tracks blood-oxygen levels inside the muscle with NIRS sensors over Bluetooth — visualised live and reviewable after training.
Visit
Client
Health
Autonom Health
Surfaces overall health insights from an ECG chest strap connected over Bluetooth.
Visit
Client
Health
Smart COPD Trainer
Supports COPD patients in tracking sleep quality, blood-oxygen and lung capacity via Bluetooth sensors.
Visit
Client
Security · Utility
world4you
Two-factor authentication app for the Austrian web-hosting provider world4you.
Visit
// Side projects
Things I build for fun
Spare-time work — mostly Kotlin Multiplatform experiments. All open source on GitHub.
// About
Kotlin, from idea to store
I'm a freelance Android developer in Vienna who has been shipping native apps since 2017, across health, fitness, efficiency and entertainment. Lately I work intensely on Kotlin Multiplatform — sharing logic and UI across iOS and Android with Compose Multiplatform.
MSc 2022Visual Computing
BSc 2018Media Informatics & Visual Computing
KotlinComposeKMPCoroutines
FlowRoomSupabaseFirebase
BLEMedia3Bitmovin
// Contact
Let's build something
Have an Android or Kotlin Multiplatform project in mind? Send me an email — I usually reply within a day.
office@maximilianproell.com