Frederik Braun
Security Engineering Manager at Mozilla
Berlin, Germany
Summary
🤩
Rockstar🎓
Top SchoolFrederik Braun is a Security Engineering Manager with 14 years of experience building defenses for Firefox and the wider web platform, combining hands-on engineering, threat modeling, fuzzing, and bug-bounty operations. He has grown and led a remote, distributed security team while delivering high-impact features such as HTTPS-First mode and mixed-content upgrades and driving incident response at award-winning speed. A longtime Mozilla contributor and co-author of the W3C-recommended Subresource Integrity spec, he pairs deep code-audit and testing expertise with standards work that scales across organizations. His background spans frontend, backend, and test automation—evident from contributions to gecko-dev, web-platform-tests, and legacy Gaia UI—so he comfortably moves between product-facing features and low-level engine protections. Colleagues rely on him not just to harden code but to institutionalize practices that prevent XSS and injection bugs before they reach users.
14 years of coding experience
10 years of employment as a software developer
Engineering Diploma (Dipl.-Ing.) IT-Security, Engineering Diploma (Dipl.-Ing.) IT-Security at Ruhr University Bochum
German, English
Github Skills (23)
javascript10
testing10
ui-design10
gecko10
uid10
front-end-development10
html-parsing10
browser-testing10
html10
documentation10
test-automation10
sec9
web-application-security9
content-security-policy9
browser9
Programming languages (26)
Github contributions (5)
w3c/webappsec
Mar 2014 - Jan 2021
Web Application Security Working Group repo
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:76 commits, 43 PRs, 50 pushes in 6 years 11 months
Contributions summary:Frederik's commits primarily focus on updating and modifying the `index.html` files related to the Subresource Integrity (SRI) specification. These changes involve adjusting code examples, fixing typos in references, and updating the overall structure of the documentation. The user also addressed issues related to the specification's template file by correcting the editor's information. Furthermore, commits demonstrate proficiency in making adjustments according to other specifications, indicating a focus on maintaining the accuracy and completeness of the documentation.
web-application-security
mozilla/gecko-dev
Sep 2016 - Nov 2022
SUPERSEDED by https://github.com/mozilla-firefox/firefox.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 & QA Engineer
Back-end Developer & QA EngineerContributions:225 commits in 6 years 3 months
Contributions summary:Frederik's commits primarily focus on modifying and adding tests within the Mozilla Gecko browser engine codebase. Their work involves the implementation of performance metrics through the use of GleanMetrics and changes within the parser and HTML tree builder. Additionally, they implemented several changes related to mixed content blocking, CSP, and WebSockets, confirming the testing aspects of their role. Furthermore, the user also addresses various minor bug fixes and enhancements, including removing Vim commands.
firefoxgit-mirrormercurialmozilla-firefox
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