Ruben Fiszel

founder@windmill.dev - oss workflow engine & dev platform with no compromises

๐Ÿ“ France๐Ÿ”„ Updated September 2026๐Ÿ’ผ 4 investments๐Ÿ“… 4 years investing๐Ÿ—“ Last invested Jan 2025
Operator-angel๐ŸŒ France
4
Total investments
3
Early stage
0
Mid stage
0
Late stage
4y
Years active

Portfolio

4 investments ยท sorted by recency
All investments
Early stage
Mid stage
Late stage
Angel Investor
2025
We are an applied research company building foundational systems that can reason about temporal data, and predict the predictable. Our team, based in Paris, includes engineers and researchers from UC Berkeley BAIR, MILA, University of Edinburgh NLP, Inria, JP Morgan, Google Brain, Amazon SCOT, Polymathic AI, Bloomberg LP, and beyond. We are backed by Y Combinator and other top tier VC funds.
Angel Investor
Sep 2022
Metriport is an open-source platform that makes it easy for healthcare organizations to access and exchange medical data for their patients.
Angel Investor
Sep 2022
Depot is a build acceleration and developer productivity platform that speeds up container builds and GitHub Actions runners by up to 40x.
Angel Investor
2022
Open Source Metering & Usage-Based Billing The best alternative to Chargebee, Recurly and Stripe Billing. For usage-based, subscription-based, and all the nuances of pricing in between.
Experience ยท 5 entries
All (5)
Investments (4)
Founder (1)
2025
Angel Investor
2025
We are an applied research company building foundational systems that can reason about temporal data, and predict the predictable. Our team, based in Paris, includes engineers and researchers from UC Berkeley BAIR, MILA, University of Edinburgh NLP, Inria, JP Morgan, Google Brain, Amazon SCOT, Polymathic AI, Bloomberg LP, and beyond. We are backed by Y Combinator and other top tier VC funds.
2022
Angel Investor
Sep 2022
Metriport is an open-source platform that makes it easy for healthcare organizations to access and exchange medical data for their patients.
Angel Investor
Sep 2022
Depot is a build acceleration and developer productivity platform that speeds up container builds and GitHub Actions runners by up to 40x.
Angel Investor
2022
Open Source Metering & Usage-Based Billing The best alternative to Chargebee, Recurly and Stripe Billing. For usage-based, subscription-based, and all the nuances of pricing in between.
2021
Founder
Dec 2021
OSS self-hostable developer platform for APIs, background jobs, workflows and UIs. Easily create invincible workflows and apps with code only where it matters.
Investment activity
2022โ€“2025 ยท 4 investments
2022320251
Recent (last 2 years)Earlier