Startup CTO  ·  Game Developer  ·  Full-Stack Engineer

Hi, I'm Christoph.

Game developer turned startup CTO — I co-founded SellPilot and shipped titles to Steam, iOS and Android, building everything full-stack.

SellPilot
ErnieApp
IE University
Steam
GMTK Game Jam 2026
Gravora
Google Play
App Store
Westnetz
Laser Chess
Scroll to explore

Five countries. One constant.

I grew up between Italy, Germany, Norway and Portugal, and landed in Madrid for university — which explains both the languages and the tendency to adapt fast. Chess was the thread through all of it; I still compete at 2400 ELO, top 1000 on chess.com.

I started building games as a kid, just for fun — eventually shipped Gravora to Steam and Laser Chess to iOS and Android. That same drive became SellPilot, where I'm CTO and build the whole stack.

5 Spoken languages
500+ Users
20+ Projects built
Christoph Rintz
Education
BCSAI — Computer Science & AI
IE University  ·  Madrid 2024 — Present

Bachelor's covering algorithms, machine learning, systems programming, databases and AI — studied in English in Madrid. GPA 8.91 / 10.

Abitur — German High School Diploma
German School of Lisbon  ·  Portugal 2024

Final grade 1.8 (German scale: 1.0 is highest). Grew up attending schools across Italy, Germany, Norway and Portugal.

Experience
CTO & Co-Founder
SellPilot  ·  Madrid 2024 — Present

Building the full product solo — React Native app, Node.js backend, Firebase & PostgreSQL. 500+ beta users. In investment discussions with Winterberg Group.

Part-Time Developer
ErnieApp  ·  Lisbon & Madrid Jun 2022 — Present

AI-powered localization pipeline, frontend features, and building the marketplace UI from scratch.

Software Intern
Westnetz (RWE Group)  ·  Germany May – Jun 2022

Built internal tooling and worked on energy grid software for one of Germany's largest energy networks.

Technical Stack
Python Three.js JavaScript Git TypeScript scikit-learn React Native PostgreSQL Node.js GLSL React C Godot Django Firebase Unity Java Azure Unreal Engine Railway Solidity
Product & Startup Work

Commercial products I build and ship

Featured Projects

Games, simulations, tools & research

Prefer the full story? See my Experience & Education

Let's Connect

Open to opportunities, collaborations, and interesting conversations.

  +351 969 244 176   Madrid, Spain
Christoph.
Startup CTO  |  Game Developer  |  Full-Stack Engineer

All Projects
Product & Startup
Games
Simulations
Academic