Mason Freed
Senior Staff Software Engineer at Google
United States
Summary
🤩
Rockstar🎓
Top SchoolMason Freed is a Senior Staff Software Engineer at Google with over 7 years in software engineering and a two-decade-long technical career rooted in PhD-level electrical engineering and mechanical engineering from UC Berkeley. He brings rare cross-domain experience, from co-founding and architecting wafer-mounted sensor systems to leading software and imaging teams in industry, then moving into large-scale browser engine work on Chromium/Blink. At Google he combines deep systems and front-end expertise, contributing to Web Platform Tests—notably adding rigorous coverage for the backdrop-filter CSS feature and its interactions with opacity, clipping, isolation, and animation. Prior roles span quantitative analysis at GMO and senior engineering leadership at Xradia and KLA Tencor, reflecting strength in both product-driven engineering and data-driven problem solving. Colleagues know him for shipping robust, test-first features that surface subtle interoperability bugs across complex stacks. He pairs academic rigor with pragmatic execution, often focusing on edge-case correctness that improves cross-browser web compatibility.
7 years of coding experience
19 years of employment as a software developer
B.S., Mechanical Engineering, B.S., Mechanical Engineering at University of California, Berkeley
Stackoverflow
6,783reputation
1.9mreached
9answers
1question
dom
top-1%
javascript
top-1%
Github Skills (15)
html10
css10
javascript10
webpagetest10
webtest10
dom10
web-testing10
test-automation10
css-animations9
enums6
shadow-dom6
matlab6
macos6
google-chrome6
dhtml6
Programming languages (15)
Github contributions (5)
web-platform-tests/wpt
Nov 2018 - Mar 2021
Test suites for Web platform specs — including WHATWG, W3C, and others
Role in this project:
Front-end Developer & Test Automation Engineer
Front-end Developer & Test Automation EngineerContributions:19 reviews, 101 commits, 3 PRs in 2 years 4 months
Contributions summary:Mason has primarily focused on developing and testing features related to the backdrop-filter CSS property within the Web Platform Tests repository. They have been actively adding and modifying WPT tests to cover various aspects of the backdrop-filter functionality, including its interaction with opacity, clipping, isolation, and animation. Their work involved creating tests for known issues and ensuring the correct behavior of the filter under different conditions.
microsoft-edgetest-runnerspecssafarifirefox
mfreed7/mutation-events-polyfill
May 2023 - Nov 2024
A polyfill for Mutation Events, using Mutation Observer
Contributions:3 reviews, 1 PR, 22 pushes in 1 year 5 months
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.