Steven Levithan
Founder at Sugu
Belgrade, Central Serbia
Summary
🤩
RockstarSteven Levithan is a seasoned software engineer and founder with 14 years of experience building web platforms and leading engineering teams across startups and large tech organizations. He has held engineering and management roles at Facebook and Paxos before founding Sugu, blending hands-on development with people leadership. Steven’s deep JavaScript expertise shows in open-source contributions to the popular Shiki syntax highlighter, where he improved the regex engine for better grammar support and performance. Comfortable across backend systems and developer tooling, he focuses on pragmatic optimizations like lazy compilation for long patterns that yield measurable runtime gains. Based in Belgrade, he brings an international perspective from long tenures in diverse engineering environments and a track record of turning complex parsing and performance challenges into robust solutions.
14 years of coding experience
15 years of employment as a software developer
Stackoverflow
1,404reputation
3.9mreached
21answers
1question
javascript
top-5%
unicode
top-5%
regex
top-5%
Github Skills (17)
javascript10
regular-expression10
syntax-highlighting10
unit-testing9
regex9
unicode9
optimisation9
optimization9
data-transfer6
internet-explorer6
trim6
xregexp6
unicode-normalization6
innertext6
twitter6
Programming languages (10)
Github contributions (5)
shikijs/shiki
Aug 2024 - Mar 2025
A beautiful yet powerful syntax highlighter
Role in this project:
Backend Developer
Backend DeveloperContributions:8 reviews, 17 PRs, 96 comments in 6 months
Contributions summary:Steven focused on enhancing the JavaScript regex engine within the Shiki project. Their contributions primarily involved updating dependencies related to the regex engine, specifically `oniguruma-to-es`, to improve grammar support, performance, and compatibility with various ECMAScript versions. The user implemented several improvements to the JavaScript regex engine, including features like lazy compilation for long patterns and optimizations for better performance in certain grammar scenarios. They also modified the test suite and improved its integration with the Javascript engine.
highlightvimsyntax-highlightervscodevscode-extension
slevithan/regex
May 2024 - Mar 2025
JS regexes + future. A template tag for readable, high-performance, native JS regexes with extended syntax, context-aware interpolation, and always-on best practices.
Contributions:26 releases, 1 review, 9 PRs in 9 months
one-of-a-kindregexregular-expression
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