Johan Bay - Software Engineer at Google

Johan Bay

Software Engineer at Google

Greater Aarhus Area Denmark

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Summary

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Rockstar

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Top School

Johan Bay is a software engineer with 11 years of experience combining systems-level performance work and front-end tooling, currently building software at Google from Greater Aarhus Area, Denmark. He has a strong academic foundation (PhD work in logic and semantics) and a history of teaching core CS courses, which complements his hands-on engineering perspective. Johan is an active open-source contributor to high-profile projects like Puppeteer and Kotlin, where he’s implemented custom query handlers, optimized garbage collection, and improved DevTools UI and tests. His work spans full-stack changes touching runtime internals, browser automation, and CSS/component maintenance—demonstrating both deep backend performance instincts and practical front-end craftsmanship. Notably, he blends research-grade rigor with production impact, having moved from a PhD lab into shipping features and optimizations used by large developer ecosystems.

11 years of coding experience

Master's degree, Computer Science, Master's degree, Computer Science at Aarhus University

STX, Matematik - Samfundsfag, STX, Matematik - Samfundsfag at Viby Gymnasium

Bachelor’s Degree, Computer Science, Bachelor’s Degree, Computer Science at Aarhus Universitet

Github Skills (37)

kotlin10

javascript10

performance-analytics10

performance-monitor10

testing10

css10

collector10

performance-measurement10

devtools10

automation10

performance-analysis10

garbage10

performance-tuning10

g10

nodejs10

Programming languages (7)

TypeScriptC++JavaScriptHaskellHTMLKotlinClojure

Github contributions (5)

ChromeDevTools/devtools-frontend

Jul 2020 - Jun 2022

The Chrome DevTools UI

Role in this project:

Front-end Developer

Contributions:115 commits in 1 year 11 months

Contributions summary:Johan primarily focused on maintaining and improving the Chrome DevTools UI, as evidenced by the commits related to CSS styles and component modifications. They fixed stylelint-config-standard issues across various CSS files, specifically targeting the `color_picker/spectrum.css` and `settings/frameworkBlackboxSettingsTab.css` files. The user introduced custom query handlers to allow the use of existing JavaScript libraries to select components across the shadow DOM. They also rolled back and forth on Puppeteer dependencies and also updated some E2E test steps in the test files.

instrumentationreactjavascriptchromecdp

puppeteer/puppeteer

Jul 2020 - May 2022

JavaScript API for Chrome and Firefox

Role in this project:

Full-stack Developer

Contributions:2 releases, 77 reviews, 46 PRs in 1 year 10 months

Contributions summary:Johan primarily contributed to the Puppeteer library by implementing and refactoring core functionalities related to custom query handlers. They added new features allowing for custom selectors and the ability to query the DOM using custom methods. The user's changes touched upon multiple files including core modules like `JSHandle`, `QueryHandler`, `DOMWorld`, and test files demonstrating a full-stack approach in modifying the framework. They also updated documentation and performed Chromium version roll updates.

developer-toolschromiumheadlessjavascriptnodejs

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