Daniel St Jules
Engineering at Cursor
San Francisco, California, United States
Summary
🤩
Rockstar🎓
Top SchoolDaniel St Jules is a seasoned engineering leader with 14 years building and scaling distributed systems, stream processing, fintech and martech platforms from 0→1 to multi-million events-per-second production. He’s held senior roles at Segment (acquired by Twilio) and Rippling—where he led large organizations and scaled global payroll and spend systems—and is currently engineering at Cursor. A hands-on engineer and open-source contributor, his work spans backend libraries (e.g., a PHP multibyte Stringy library), tooling to detect duplicated JS code (jsinspect), and contributions to widely used projects like Mocha and Zendesk’s cross-storage. He combines deep platform intuition (scaling event delivery to 1M/s and 1T+ monthly) with practical front-end and testing improvements, often tackling edge cases and refactors that improve long-term reliability. Based in San Francisco with a computer science degree from the University of Ottawa, he enjoys turning complex distributed challenges into pragmatic, testable systems.
14 years of coding experience
11 years of employment as a software developer
Honours B.Sc. with Specialization in Computer Science Computer Science, Honours B.Sc. with Specialization in Computer Science Computer Science at University of Ottawa
French, English
Github Skills (28)
javascript10
es6-promise10
testing10
text-manipulation10
test-framework10
rails10
babylonjs10
phpunit10
mochajs10
php10
code-analysis10
front-end-development10
html10
nodejs10
refactoring10
Programming languages (10)
Github contributions (5)
danielstjules/jsinspect
Sep 2014 - Aug 2017
Detect copy-pasted and structurally similar code
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:23 releases, 208 commits, 13 PRs in 2 years 11 months
Contributions summary:Daniel was involved in developing and refactoring code for a JavaScript-based code inspection tool. They worked on implementing the core functionality of the inspector, including parsing code, identifying duplicate code patterns, and generating matches. Their contributions included refactoring the code to improve efficiency and maintainability, as well as adding features like JSX support, improved identifier handling, and a variety of output reporters, including JSON and PMD formats.
detectsimilarcode-analysisduplicationrefactoring
danielstjules/Stringy
Jul 2013 - Jun 2017
A PHP string manipulation library with multibyte support
Role in this project:Back-end Developer
Back-end DeveloperContributions:14 releases, 320 commits, 75 PRs in 3 years 11 months
Contributions summary:Daniel was primarily focused on developing a PHP string manipulation library. They implemented new functions such as `dasherize`, `underscored`, and `swapCase`. They also added the `titleize`, `humanize`, `clean`, `standardize`, `pad`, `padLeft`, `padRight`, `padBoth`, `startsWith`, `endsWith`, `toSpaces`, `toTabs`, `slugify`, `contains`, `surround`, `insert`, `safeTruncate`, `reverse`, `shuffle`, `longestCommonPrefix`, `longestCommonSuffix`, `longestCommonSubstring`, `length`, `substr`, `at`, `first`, and `last` methods, indicating a focus on core functionality. Several test cases were created to ensure the library's functions worked correctly.
multibytephpstringsutf-8
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