Achievements
- Joined Y Combinator S23
- Studied physics and computer science at RWTH Aachen
- Developed membership inference attacks against LLMs
- Worked on AI privacy and robustness research
- Co-founded Revideo, open source video editing framework
- Research engineer at Prime Intellect focusing on reinforcement learning and synthetic data
Check out Justus Mattern
Yo, have you heard of Justus Mattern? The guy’s the real deal in the startup and AI world. He just jumped into YC S23, so he’s fresh in the scene, but trust me, he’s been crushing it for a minute.
So here’s the scoop. Justus started out studying physics and computer science at RWTH Aachen in Germany – a solid combo, right? That’s where he got his brain tuned for tackling complex problems. From there, he jumped into the AI space hard. He’s got serious creds in research, especially around AI privacy and making models more robust. Think about developing membership inference attacks against LLMs and working on ways to anonymize textual data with differential privacy – basically making AI smarter but also safer and more private. That’s some advanced stuff.
He’s been in the trenches at places like Dynamo AI, where he worked on computer vision and speech recognition for edge devices and federated learning systems. Basically, he was building tech that runs on your phone or IoT gadgets, making AI more accessible and decentralized. That’s a huge deal because it shows he’s all about making AI practical, not just theory.
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Talk to herThen, he co-founded Revideo – an open source framework for programmatic video editing. Basically, he’s trying to change how videos are made, making editing automated and more accessible, which is wild because it’s like bringing AI into content creation in a big way. It’s original, practical, and super modern.
Right now, he’s based in Berlin but spends part of his time in San Francisco, jumping between worlds – Europe and the US – which is kinda the perfect setup for someone building the future trend in AI and tech. He’s deep in the YC community too, attending events, talking shop, and clearly making moves.
What’s his story telling us? Man’s all about pushing boundaries. He’s been in the trenches with AI research, making models smarter and safer, then jumped into startups to build tools that actually shake up industries. His process oozes passion for tech that’s both original and useful. He’s not here just to hype things up – he’s about making shit work better, smarter, faster.
This guy’s the kind of founder who’s been grinding in the labs, then jumped into startups, and now he’s got his sights set on transforming how we make videos and handle AI privacy. No Cap. He’s the real deal, someone who’s not just riding the wave but actually making the wave happen.

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