Peter Hedenskog
Software Engineer at Wikimedia Foundation
Stockholm, Stockholm County, Sweden
Summary
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RockstarPeter Hedenskog is a seasoned software engineer based in Stockholm with 14 years of experience building and scaling high-traffic dynamic websites. He is the creator of the widely used open-source performance tool sitespeed.io and has been recognized by the Swedish Internet Infrastructure Foundation for his work. At Wikimedia Foundation he applies his expertise in web performance, having previously served as a web architect and tech lead for major clients like Sony Mobile and IKEA. Peter combines full-stack development skills with a strong focus on performance, accessibility, and documentation—evident in his hands-on contributions to both the core sitespeed.io project and its Coach tool. He’s comfortable translating technical performance insights for nontechnical audiences and has shared his knowledge at international conferences and podcasts. An often-overlooked strength is his ability to improve tooling maintainability and testing practices, not just raw metrics.
13 years of coding experience
16 years of employment as a software developer
Github Skills (11)
accessibility10
html10
uitest10
moc10
webaccess10
javascript10
performance-optimization10
chai10
documentation10
testing10
css8
Programming languages (16)
Github contributions (5)
sitespeedio/coach
Jan 2016 - Dec 2021
Clear Eyes. Full Hearts. Can’t Lose.
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:18 releases, 827 commits, 129 PRs in 5 years 11 months
Contributions summary:Peter primarily focused on improving the functionality and maintainability of the Coach tool. The commits reveal modifications to the testing framework, specifically related to adjusting the timing of tests and ensuring accurate checks. They also made improvements to the advice text and logic within the tool, covering various aspects of web performance and accessibility, reflecting a focus on enhancing the user experience and code quality. Furthermore, the user streamlined the output format by combining DOM and HAR results, and addressed bugs, such as the lack of a favicon.
eyesheartsperformanceperfmatterscoach
sitespeedio/sitespeed.io
Jul 2012 - Jan 2023
sitespeed.io is an open-source tool for comprehensive web performance analysis, enabling you to test, monitor, and optimize your website’s speed using real browsers in various environments.
Role in this project:Front-end Developer
Front-end DeveloperContributions:381 releases, 2 reviews, 7728 commits in 10 years 8 months
Contributions summary:Peter's contributions primarily involved the modification and enhancement of the sitespeed.io documentation, which showcases the user's focus on improving the user experience and presentation of the tool's documentation. The user was responsible for enhancing the visual layout of the documentation pages. The work involved HTML modifications to the documentation.
monitorbest-performanceuser-apispeedindexcoach
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