Thomas Wisniewski - Web Compatibility Engineer

Thomas Wisniewski

Web Compatibility Engineer

Belleville, Ontario, Canada

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Summary

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Rockstar

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Top School

Thomas Wisniewski is a Web Compatibility Engineer with over a decade of hands-on experience building standards-compliant, cross-platform web applications and modernizing legacy codebases. At Mozilla since 2016 he diagnoses interoperability issues and implements targeted browser interventions—contributing to high-profile projects like web-platform-tests and Firefox where his work on UA overrides, CSS/JS shims, and test coverage improves real-world site behavior. He spans the full stack from low-level library work and test automation to front-end fixes that resolve layout and feature regressions, and he’s comfortable shipping pragmatic solutions across JavaScript, Python, and PHP. Known for methodical refactoring and spec-driven testing, he combines practical system administration and integration experience with a focus on maintainability so teams can iterate safely. Based in Belleville, Ontario, he brings startup agility and enterprise rigor to webcompat challenges that often hide in corner cases.

10 years of coding experience

6 years of employment as a software developer

Trent University

Github Skills (21)

webbrowser10

compatible10

javascript10

xmlhttprequest10

ui-components10

testing10

css10

browser10

browser-support10

component-kit10

firefox10

web-standards10

android10

html10

web-development10

Programming languages (13)

C#C++BikeshedRustHandlebarsHTMLFreeMarkerKotlin

Github contributions (5)

mozilla/gecko-dev

Jul 2016 - Jan 2023

Read-only Git mirror of the Mercurial gecko repositories at https://hg.mozilla.org. How to contribute: https://firefox-source-docs.mozilla.org/contributing/contribution_quickref.html

Role in this project:

Front-end Developer

Contributions:406 commits in 6 years 7 months

Contributions summary:Thomas's commits primarily involve implementing features and improvements within the browser's web compatibility features. They added and modified CSS and JavaScript files to address compatibility issues with websites, improving the user experience on specific sites. This included fixing layout issues, hiding unwanted content, and ensuring proper behavior of user interface elements such as scrollbars and buttons. Furthermore, the user's contributions demonstrate expertise in identifying and resolving compatibility problems related to various aspects of web design and implementation.

repositoriesfirefoxmercurialgit-mirrormozilla

mozilla-mobile/firefox-android

Aug 2020 - Nov 2022

:warning: This repository hosts the Firefox for Android (Fenix), Focus for Android, and Mozilla Android Components projects. It is now developed and maintained as part of Mozilla Central. See the announcement here: https://github.com/mozilla-mobile/firefox-android/wiki#upcoming-migration-to-mozilla-central. ”

Role in this project:

Full-stack Developer

Contributions:13 reviews, 15 commits, 12 PRs in 2 years 3 months

Contributions summary:Thomas primarily contributed to the `feature-webcompat` component, focusing on improving web compatibility for the Firefox Android browser. Their commits involved implementing various interventions, including UA overrides and CSS/JS injections, to address website compatibility issues. These changes included fixing rendering problems, enabling missing features, and addressing compatibility problems with various sites. The user also updated existing shims and interventions, reflecting ongoing efforts to enhance the browsing experience.

firefoxhostsandroidandroid-componentsfirefox-for-android

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