Tassilo
Posegga

Tech lead & builder.

I lead engineering by day and build AI-native apps and games on the side — from a calm-anxiety companion to a millisecond reaction game.

See what I build → Get in touch

About

Engineering leadership, plus a building habit.

Engineering lead with 8+ years of Android experience across healthcare, automotive, retail and classifieds. I run engineering chapters and product teams — setting architectural direction, driving automation and process improvements, mentoring engineers, and shaping a strong technical culture.

I stay close to the platform, especially around architecture decisions and AI integration. Happiest where product, platform and people meet — and after hours I build complete products end to end, from design and code to backend and store launch.

Toolbox

Technical leadershipArchitectureMentoring & coachingAndroidKotlin & JavaClean ArchitectureKotlin MultiplatformCI/CD & automationAI integrationComposeRoadmappingHiring & interviewing

Selected projects

Things I've shipped.

A mix of live apps and works in progress — built solo, end to end.

Pennywise app icon

Pennywise

Live

A penny-auction platform — mobile app, web client and an admin dashboard on a single Kotlin Multiplatform codebase, backed by a Ktor + PostgreSQL + Redis server. Self-hosted on a Hetzner VPS.

pennywise.live ↗
Calmamity app icon

Calmamity

Live

An AI companion for calming anxiety in the moment — conversational support that meets you where you are. KMP + Compose, Firebase backend.

Google Play ↗
SplitSecond app icon

SplitSecond

Live

A minimalist reaction-timing game: wait for the signal, tap the instant it fires, chase your best to the millisecond. KMP across Android, iOS, Web & Desktop.

Google Play ↗
Demotiv8 daily poster

Demotiv8.me

Live

One demotivational truth, every day. Auto-generated daily poster art delivered through a clean, server-rendered web app. Next.js + Firebase.

demotiv8.me ↗
posegga.eu logo

posegga.eu

Live

This very site — a static personal site built with Astro, self-hosted fonts and zero third-party calls, served from my own Hetzner VPS.

Source ↗
Elementex app icon

Elementex

In development

A mobile game I'm building on the side. More to share soon.

Coming soon

Work

Where I've worked.

Eight years building and leading Android teams in Munich — healthcare, automotive, retail and classifieds.

Apr 2026 — Present

System Engineer, Android

Quartett Mobile · Munich
Interface between the Volkswagen app team and the surrounding backend & SDK teams — driving architectural direction, automation and platform governance across the Android stack.
Feb 2025 — Mar 2026

Lead Android Developer

Quartett Mobile · Munich
Led Android on the Volkswagen connected-vehicle team, owning the technical roadmap for the in-app mobile experience.
Apr 2022 — Jan 2025

Android Chapter Lead

Kaia Health · Munich
Technical leadership across the Android chapter — architecture, code quality, automation and culture — while still shipping as a product engineer.
Oct 2021 — Mar 2022

Engineering Manager (interim)

Kaia Health · Munich
Interim EM for the Motion Coach team — optimised team structure with both technical and people leadership.
Jul 2020 — Sep 2021

Senior Android Developer

Kaia Health · Munich
Built the foundation of Kaia's AI-driven physiotherapy app — integrated ML models as an internal SDK and shared business logic via Kotlin Multiplatform.
Sep 2019 — Mar 2020

Senior Android Developer

AutoScout24 · Munich
Consumer Android features for one of Europe's largest used-car marketplaces, with a focus on scalable, high-performance code.
Mar 2017 — Aug 2019

Android Developer

MediaMarktSaturn Technology · Munich
Shipped consumer Android apps for MediaMarkt and Saturn — grew features and refactored the architecture for performance and maintainability.

Education

2014 — 2017

MSc Engineering — Mobile Computing

University of Applied Sciences Upper Austria · Hagenberg
2014 — 2015

Exchange Semester — Interface Culture

University of Arts and Industrial Design · Linz
2010 — 2013

BSc Engineering — Mobile Computing

University of Applied Sciences Upper Austria · Hagenberg

Contact

Let's talk.

Building something, hiring, or just want to compare notes? My inbox is open.

tassilo@posegga.eu