Startup CTO  ·  Game Developer  ·  Full-Stack Engineer

Hi, I'm Christoph.

Game developer turned startup CTO who 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
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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, and 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