Ksenia Berezina
Senior Software Engineer at Mozilla
Toronto, Ontario, Canada
Summary
🤩
Rockstar🎓
Top SchoolKsenia Berezina is a Senior Software Engineer in Toronto with 7 years of professional experience building resilient front-ends and integrating backend data tooling. At Mozilla she focuses on web compatibility for Firefox on Android, shipping pragmatic JavaScript/CSS and User-Agent interventions that fix real-world site breakage across high-profile pages and map integrations. Her work spans front-end engineering and data-driven backend contributions—she has implemented GitHub issue retrieval and a needs-diagnosis ML model for Mozilla’s bugbug platform. Previously she developed SPAs and GIS web apps using AngularJS, OpenLayers and robust testing practices, demonstrating strong cross-browser and UI/UX instincts. She combines hands-on bug-hunting with machine learning pragmatism, often solving problems by patching both client-side rendering and backend classification logic.
7 years of coding experience
8 years of employment as a software developer
Bachelor's degree, Computer science and engineering, Bachelor's degree, Computer science and engineering at Ural Federal University
Github Skills (24)
javascript10
python10
apidoc10
ui-components10
css10
machine-learning10
browser10
firefox10
component-kit10
api10
front-end-development10
github-api10
android10
data-science9
computer-engineering9
Programming languages (8)
Github contributions (5)
mozilla-mobile/firefox-android
Feb 2020 - Dec 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:
Front-end Developer
Front-end DeveloperContributions:9 reviews, 11 commits, 6 PRs in 2 years 10 months
Contributions summary:Ksenia primarily contributed to the `firefox-android` repository by implementing and modifying WebCompat interventions. These interventions involve writing JavaScript, CSS, and modifying User-Agent strings to address compatibility issues with various websites. The contributions involved patching websites like `automotivesuperstore.com.au`, `animalplanet.com` and integrating fixes for sites with various browser compatibility issues, often modifying the user's browser settings. The user’s work ensures a more consistent and functional web browsing experience for Firefox for Android users.
firefoxhostsandroidandroid-componentsfirefox-for-android
mozilla-mobile/android-components
Feb 2020 - Aug 2022
⚠️ This project moved to a new repository. It is now developed and maintained at: https://github.com/mozilla-mobile/firefox-android
Role in this project:Front-end Developer
Front-end DeveloperContributions:1 review, 10 commits, 10 PRs in 2 years 6 months
Contributions summary:Ksenia primarily focused on web compatibility enhancements within the Android components repository. They implemented various User-Agent overrides to address issues where websites displayed incorrectly on Firefox for Android, particularly resolving layout and functionality problems on sites like automotivesuperstore.com.au and animalplanet.com. Their work involved modifying JavaScript and CSS to adjust user interface elements, correct rendering issues, and add shims for broken features. The user also addressed problems related to Google Maps.
firefoxbrowserfirebasefirefox-androidandroid
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.