Randell Jesup
Senior Staff Software Engineer at Mozilla Corporation
Malvern, Pennsylvania, United States
Summary
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Rockstar🎓
Top SchoolRandell Jesup is a Senior Staff Software Engineer and interim tech lead at Mozilla with over three decades of systems and networking experience and 14 years formally at Mozilla. He’s driven major browser performance wins—leading Fission site-isolation performance work and personally shipping patches that cut page load times by up to half—and currently focuses on shipping WebTransport while navigating IETF and W3C spec work. A long-term Firefox contributor (since 2000) and implementer of WebRTC DataChannels, he blends deep protocol expertise with practical engineering across networking, workers, storage, and security. His open-source contributions span core Gecko networking fixes, Web Platform Tests for WebTransport, and front-end improvements to the Firefox Profiler, showing fluency from low-level C++ to test automation and UI. Former roles in DSP-based videophones and early OS and filesystem work underpin rare hands-on skills in RTP/SIP, real-time congestion control, and performance-sensitive embedded code. Based in Malvern, PA, he pairs standards leadership in IETF/W3C with a track record of mentoring teams and elevating technical leadership.
15 years of coding experience
26 years of employment as a software developer
Collegiate SchoolWestminsterComputer Science, Computer Science at Rensselaer Polytechnic Institute
Stackoverflow
6,864reputation
940kreached
187answers
2questions
debugging
top-5%
gdb
top-5%
webrtc
top-1%
linux
top-5%
javascript
top-5%
Github Skills (33)
javascript10
c-language10
testing10
http10
network-programming10
redux10
dns10
cprogramming-language10
webrtc10
react10
webtransport10
test-automation10
performance-monitor9
debugging9
caching9
Programming languages (12)
Github contributions (5)
mozilla/gecko-dev
Jul 2012 - Feb 2021
SUPERSEDED by https://github.com/mozilla-firefox/firefox. Read-only Git mirror of the Mercurial gecko repositories at https://hg.mozilla.org
Role in this project:
Back-end Developer
Back-end DeveloperContributions:700 commits in 8 years 8 months
Contributions summary:Randell primarily contributes to the Mozilla Gecko-dev repository by fixing bugs and making performance improvements. Their work involves cleaning up and refactoring code related to DNS request handling, memory reporting in cache file managers, and the handling of OnDataAvailable events in HTTP channels. The contributions include code changes across network-related modules, focusing on efficient data handling and protocol implementations.
firefoxgit-mirrormercurialmozilla-firefox
firefox-devtools/profiler
Apr 2018 - Jan 2020
Firefox Profiler — Web app for Firefox performance analysis
Role in this project:Front-end Developer
Front-end DeveloperContributions:20 commits, 10 PRs, 17 comments in 1 year 9 months
Contributions summary:Randell primarily focused on enhancing the Firefox Profiler's user interface and functionality. Their work included adding network load tooltips, supporting new network statuses (STOP, REDIRECT), and enabling longer marker titles. They also updated the privacy notice and added documentation for the network markers. Further contributions involved adding text markers and improvements to the marker tooltip and chart components.
firefoxjavascriptreactreduxperformance
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