Jan Scheffler
Founder at PEQY
Münster, North Rhine-Westphalia, Germany
Summary
🤩
Rockstar🎓
Top SchoolJan Scheffler is a founder and seasoned software engineer with 11 years of experience building developer-facing tools and production-grade web systems. He now leads PEQY, an AI code reviewer that integrates with GitHub and GitLab and is trained on research from 1,600+ repositories and dozens of developer interviews to reduce noisy suggestions and surface real bugs, security gaps, and performance regressions. His background spans hands-on roles at Google and senior engineering and CTO positions, plus notable open-source contributions to Puppeteer where he implemented network and CPU emulation features used for real-world browser testing. Based in Münster, Germany, Jan pairs a physics degree with legal studies, a combination that informs his analytical approach to product design and compliance-aware engineering.
11 years of coding experience
12 years of employment as a software developer
Bachelor of Science - BS Physics, Bachelor of Science - BS Physics at University of MünsterBachelor of Laws - LLB, Bachelor of Laws - LLB at FernUniversität in Hagen
Russian, German, English, French, Spanish
Stackoverflow
1reputation
0reached
1answer
0questions
Github Skills (15)
automation10
javascript10
chromium10
automations10
testing10
web-content9
chromeless9
chrome9
headless-browser9
webpages9
nodejs9
firefox7
git6
xcode6
ios6
Programming languages (7)
Github contributions (5)
puppeteer/puppeteer
Apr 2020 - Nov 2021
JavaScript API for Chrome and Firefox
Role in this project:
Front-end Developer
Front-end DeveloperContributions:7 releases, 201 reviews, 154 PRs in 1 year 6 months
Contributions summary:Jan primarily contributed to the Puppeteer project by implementing and modifying features related to network conditions, target filtering, and CPU throttling, impacting the core functionality of the library. They added the `emulateNetworkConditions` and `emulateCPUThrottling` methods, enabling users to simulate different network environments. The user also worked on bug fixes, including addressing issues in AriaQueryHandler and DOMWorld to improve Puppeteer's reliability and stability. These changes involved modifying the core functionalities to enhance the user experience of the testing library.
developer-toolschromiumheadlessjavascriptnodejs
puppeteer/recorder
May 2020 - Mar 2021
Contributions:8 reviews, 63 commits, 13 PRs in 9 months
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