Jason Yuen
Software Engineer at Meta
Mountain View, California, United States
Summary
🤩
Rockstar🎓
Top SchoolJason Yuen is a software engineer with nine years of experience building reliable back-end systems, currently at Meta in Mountain View. He has a strong track record contributing to open-source projects like Lean 4 and the DMOJ online judge, where he implemented language executors, improved judge performance, and migrated rating systems to Elo-MMR. His work spans systems-level tooling, compilers/exec environments, and data-consistent platform features, with attention to type-safety, internationalization, and edge-case correctness. A Waterloo alumnus by training, Jason pairs production experience at major tech firms and internships with careful, detail-oriented contributions—often fixing subtle bugs and documentation issues that improve long-term maintainability. Notably, his GitHub persona cheekily references language redeclaration quirks, reflecting a developer mindset tuned to language semantics and correctness.
9 years of coding experience
2 years of employment as a software developer
University of Waterloo
Github Skills (23)
postgresql10
online-algorithms10
python10
django10
theorem-proving10
type-theory10
leanback10
computer-science10
llvm9
data-structure9
algorithm9
algorithms9
t49
data-structures9
slim9
Programming languages (13)
Github contributions (5)
DMOJ/judge-server
Nov 2017 - Jan 2023
Judging backend server for the DMOJ online judge.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:10 reviews, 15 commits, 22 PRs in 5 years 2 months
Contributions summary:Jason primarily focused on enhancing the DMOJ judge-server backend. They implemented an executor for Lean 4, including necessary compilation steps and file system policies. Further contributions involved fixing issues in existing checkers, such as correcting the floatsrel checker to handle NaN values. They also optimized the Brainfuck executor by integrating LLVM for improved performance and added Docker test enhancements.
dmojpythoncontest-platformonline-judgelinux
DMOJ/online-judge
Dec 2019 - Jan 2023
A modern open-source online judge and contest platform system.
Role in this project:Back-end Developer
Back-end DeveloperContributions:155 reviews, 146 commits, 173 PRs in 3 years 1 month
Contributions summary:Jason made several contributions focused on improving the functionality and maintainability of the online judge platform. They fixed a bug related to contest statistics for contests with deleted problems, demonstrating an understanding of the platform's data handling. The user also migrated the rating system from Topcoder to Elo-MMR, showcasing their ability to implement and integrate complex rating algorithms. Additionally, they updated and refactored existing code and incorporated i18n messages, improving the overall user experience.
dmojpythoncontest-platformdmoj-judgeonline-judge
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