Justin Li
Quantitative Trading Intern
Berkeley, California, United States
Summary
🤩
Rockstar🎓
Top SchoolJustin Li is a versatile backend-focused software engineer and UC Berkeley EECS + Business student with 14 years of coding experience and recent internships at Jane Street, Five Rings, and OpenAI. He contributes to high-profile open-source projects across Go and Ruby—improving graceful HTTP shutdowns, GraphQL correctness, Shopify's Liquid templating, and resilience tooling like Semian—demonstrating a knack for robust server behavior and parsing internals. Comfortable across systems and trading infrastructure, he blends low-level network and concurrency work with pragmatic test-driven improvements. Based in Berkeley, he pairs strong open-source impact with quantitative internship experience, and often surfaces subtle correctness fixes (e.g., ID handling and circuit-breaker checks) that prevent production surprises.
14 years of coding experience
1 year of employment as a software developer
Bachelor's degree, Electrical Engineering and Computer Science + Business Administration, 3.99/4.0, Bachelor's degree, Electrical Engineering and Computer Science + Business Administration, 3.99/4.0 at University of California, BerkeleyDel Norte High School
Github Skills (42)
dependency-management10
parserator10
go-modules10
parser10
variable-length10
web-application10
lexer10
redis10
circuit-breaker10
testing10
variable-binding10
file-parsing10
wpgraphql10
ruby10
e-mail10
Programming languages (19)
Github contributions (5)
Shopify/liquid
Oct 2014 - Mar 2021
Liquid markup language. Safe, customer facing template language for flexible web apps.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:25 reviews, 217 commits, 116 PRs in 6 years 5 months
Contributions summary:Justin primarily focused on refactoring and improving the `liquid` templating language. They introduced new tokens, fixed variable name handling, and ensured nil values were correctly handled in variable operations. They also addressed parsing quirks and improved the template's internal workings, as well as adding forloop features. These changes demonstrate a deep understanding of the language's internal structure and parsing logic.
hamltemplatemarkup-languageliquidweb-apps
chihaya/chihaya
Aug 2013 - Oct 2018
A customizable, multi-protocol BitTorrent Tracker
Role in this project:Back-end Developer
Back-end DeveloperContributions:246 commits, 29 PRs, 51 pushes in 5 years 3 months
Contributions summary:Justin primarily contributed to the refactoring and cleanup of the Tx API within the chihaya BitTorrent tracker. Their work involved modifying the announce and redis storage components to improve the performance of the tracker. The contributions include method name refactoring, code cleanup and ensuring the appropriate operations are performed for different events. This refactoring also involved making changes to the internal storage API of the tracker.
bittorrent-protocolbittorrent-trackermulti-protocoltrackerbittorrent
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