Philip Jägenstedt
Senior Staff Software Engineer at Google
Stockholm County, Sweden
Summary
🤩
Rockstar🎓
Top School
Top expert inWeb and Mobile Security Technologies
Philip Jägenstedt is a Senior Staff Software Engineer with 17 years of experience building and hardening web platform features, currently working on Google Chrome in Stockholm. He blends deep front-end expertise, test automation, and standards work—contributing to high-profile projects like web-platform-tests, MDN browser-compat-data, Chromium dashboard and numerous W3C/WHATWG specs. His background spans hands-on browser engineering from Opera through Google, plus backend and tooling work that improves test infrastructure, compatibility data, and developer workflows. A meticulous technical writer and QA engineer, he frequently clarifies specs and documentation to reduce ambiguity across the web platform. Fluent in Mandarin and educated in both computer science and Mandarin studies, he brings rare cross-cultural communication skills to international standards collaboration. Colleagues rely on him for pragmatic, standards-aligned solutions that keep browsers interoperable and web features robust.
16 years of coding experience
17 years of employment as a software developer
Master of Science in Engineering, Computer Science and Engineering, Master of Science in Engineering, Computer Science and Engineering at Linköping UniversityMandarin Chinese, Mandarin Chinese at Beijing Language and Culture University
Github Skills (47)
json10
spec10
musicbrainz10
github-ci10
javascript10
web-platform10
dashboard10
python10
data-set10
testing10
css10
mdns10
mdc10
webpages10
web-content10
Programming languages (27)
Github contributions (5)
web-platform-dx/web-features
Dec 2022 - Mar 2023
Exploring how to present Web platform features adoptability
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:15 releases, 1066 reviews, 17 commits in 2 months
Contributions summary:Philip primarily contributed to the development and maintenance of a web-features package, focusing on feature definition and validation. They built a script to build the JSON representation of web features from YAML files and also wrote a script to check feature spec URLs against web-specs. Their work included splitting the build script into reader and writer components, integrating schema validation, and adding links to caniuse along with a completion script. The user structured the built web-features package into a subdirectory, enhancing modularity.
web-platform
web-platform-tests/wpt
Nov 2013 - Dec 2022
Test suites for Web platform specs — including WHATWG, W3C, and others
Role in this project:Test Automation Engineer & Front-end Developer
Test Automation Engineer & Front-end DeveloperContributions:1542 releases, 946 reviews, 1071 commits in 9 years 2 months
Contributions summary:Philip's contributions primarily involve test automation for web platform specifications within the `web-platform-tests/wpt` repository. Their work focuses on creating and updating tests for various browser features, as indicated by the commit messages related to feature testing like `requestFullscreen({ navigationUI }) support`, adding and correcting tests for specific features such as audio/video autoplay and the `::backdrop` CSS pseudo-element, while also improving the overall quality of the tests. The user demonstrates proficiency in using the testharness.js testing framework and a solid understanding of web platform APIs and CSS.
microsoft-edgetest-runnerspecssafarifirefox
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