Houssein Djirdeh - Senior Software Engineer at Two Sigma

Houssein Djirdeh

Senior Software Engineer at Two Sigma

New York, New York, United States

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Summary

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Rockstar

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Top School

Houssein Djirdeh is a Senior Software Engineer with 11 years of experience building high-performance front-end systems, currently at Two Sigma after four years at Google where he focused on developer relations and performance engineering. He contributed notable performance enhancements to the widely used Next.js framework—adding precise user-timing marks, FID measurement support, and optimizations to hydration and render cycles—and improved library detection for a popular Chrome extension. Based in New York, he blends deep browser and tooling expertise with hands-on product work, shipping pragmatic features like ESLint and Google Fonts rules to improve developer experience. Trained as a mechanical engineer at the University of Toronto, he brings a systems-thinking mindset to web performance and developer tooling, often surfacing nuanced metrics that reveal hidden UX regressions.

11 years of coding experience

9 years of employment as a software developer

Bachelor of Applied Science (BASc) Mechanical Engineering (Minor in Sustainable Energy), Bachelor of Applied Science (BASc) Mechanical Engineering (Minor in Sustainable Energy) at University of Toronto

Stackoverflow

Stats

21reputation

1kreached

1answer

0questions

Github Skills (25)

javascript10

browser-extension10

nextjs10

eslint10

chrome-extension10

web-performance10

jscript10

javascript-framework10

google-chrome-extension10

front-end-development10

performance-optimization10

react10

angular8

nuxt8

Programming languages (7)

TypeScriptCSSVueJavaScriptPHPHTMLNunjucks

Github contributions (5)

johnmichel/Library-Detector-for-Chrome

Nov 2018 - Jan 2023

🔍 Extension that detects which JavaScript libraries are running on a page

Role in this project:

Front-end Developer

Contributions:7 releases, 15 reviews, 87 commits in 4 years 2 months

Contributions summary:Houssein primarily contributed to the detection of JavaScript libraries within the context of a Chrome extension. Their commits added and updated detection logic for various JavaScript frameworks and libraries, including Angular, Next.js, Nuxt.js, Vue, Gatsby, Shopify, WordPress, Wix, Magento, Boq, Wiz and Create React App. The user also made updates to the library detection code, fixing null checks, and improving existing detection methods. The user also contributed to improvements in the library detection engine.

jsinteropdetectionjavascript-frameworkjavascriptchrome

vercel/next.js

Aug 2019 - Jul 2022

The React Framework

Role in this project:

Front-end Developer

Contributions:197 reviews, 51 commits, 65 PRs in 3 years

Contributions summary:Houssein primarily contributed to performance enhancements within the Next.js framework. They implemented user timing marks and measures for hydration and render cycles to improve performance analysis. They also addressed issues related to the First Input Delay (FID) metric, adding support for its measurement, and made updates to the Next.js codebase for efficient performance marking. Furthermore, the user added support for ESLint, integrated Google fonts rules, and added features related to the `next/script` component.

reactbrowserssgserver-renderingjavascript

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