Deian Stefan
Co-Founder & Chief Scientist at Cubist
San Francisco, California, United States
Summary
🤩
Rockstar🎓
Top SchoolDeian Stefan is a systems security and programming languages researcher, entrepreneur, and engineer with 15 years of experience, currently serving as Co-Founder & Chief Scientist at Cubist and an Associate Professor at UC San Diego. He co-founded Intrinsic (acquired by VMware) and sits on the board of the Bytecode Alliance, blending academic depth with startup execution in the San Francisco Bay Area. His work spans secure systems, language design, and tooling—evidenced by contributions to W3C web security specs and Haskell bindings for LLVM. Deian’s profile reflects a rare combination of formal training (PhD/MS from Stanford, engineering degrees from Cooper Union) and pragmatic engineering, moving ideas from research to production. He frequently contributes to open standards and low-level developer tooling, emphasizing clear specification and robust debug metadata. Colleagues would note his knack for tightening specification prose and fixing subtle implementation details that improve long-term maintainability.
15 years of coding experience
3 years of employment as a software developer
Bachelor of Engineering - BE Electrical Engineering, Bachelor of Engineering - BE Electrical Engineering at The Cooper Union for the Advancement of Science and ArtMaster of Science - MS Computer Science, Master of Science - MS Computer Science at Stanford University
Stackoverflow
11reputation
440reached
1answer
1question
Github Skills (14)
html10
spec10
code-generation10
llvm-ir10
specification10
haskell10
documentation10
web-application-security10
llvm10
content-management9
content-management-system9
google-chrome-extension6
browser-security6
security6
Programming languages (17)
Github contributions (5)
w3c/webappsec
Jan 2014 - Oct 2015
Web Application Security Working Group repo
Role in this project:
Technical Writer
Technical WriterContributions:11 commits, 8 PRs, 4 pushes in 1 year 9 months
Contributions summary:Deian primarily contributed to documentation and specification updates within the repository. Their commits focused on refining the content, correcting typos, and integrating comments for the "Confinement with Origin Web Labels" specification. They also added a missing table tag to the index file, indicating a focus on document structure and presentation. The changes consistently involved editing HTML files related to the W3C's web security specifications.
web-application-securityapplication-securitysecurityweb-applicationattestation
llvm-hs/llvm-hs
Dec 2018 - Sep 2019
Haskell bindings for LLVM
Role in this project:Back-end Developer
Back-end DeveloperContributions:7 commits, 5 PRs, 12 comments in 9 months
Contributions summary:Deian primarily contributed to the Haskell bindings for LLVM, as indicated by the commit messages and file changes. Their work involved implementing new features, such as support for DW_OP_Mod, and extending the functionality of the debug metadata operations within the LLVM bindings. They also removed a large test and made adjustments for UTF encoding. This indicates a focus on enhancing and maintaining the Haskell-LLVM integration.
llvm-ircode-generationllvm-hshaskell-bindingshaskell
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