Zai Shi
Co-Founder at Stack (YC S24)
San Francisco, California, United States
Summary
🤩
Rockstar🎓
Top SchoolZai Shi is a hands-on founder and software engineer with eight years of experience building developer-focused products from San Francisco. Currently co-founder at Stack (YC S24), he focuses on authentication and platform tooling—continuing work hinted by his "Building Stack Auth" GitHub note. Prior roles include machine learning engineering at DeepJudge and an earlier startup, Umi, reflecting a mix of applied ML and product-driven engineering. An ETH Zürich computer science graduate, he brings strong technical foundations to rapid startup iteration. Zai combines platform-level thinking with implementation velocity, often bridging research-grade ML work into production-ready systems. He favors pragmatic, developer-centered solutions that reduce friction for engineers and teams.
8 years of coding experience
2 years of employment as a software developer
Y CombinatorBachelor of Science - BS, Computer Science, Bachelor of Science - BS, Computer Science at ETH Zürich
Github Skills (73)
python10
authentication10
deep-learning10
auth10
session-management10
magic-link10
transformer10
nlp10
typescript10
natural-language-processing10
keycloak10
pytorch10
machine-learning10
nextjs10
clerk10
Programming languages (4)
Github contributions (5)
fomalhautb/Drift
Mar 2018 - Jun 2018
Contributions:18 commits, 7 pushes in 2 months
FomalhautB/JustGo
Jul 2017 - Jan 2019
Contributions:87 pushes, 2 branches in 1 year 6 months
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