Software Engineer, DOM Core jobs in United States
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Mozilla · 2 months ago

Software Engineer, DOM Core

positionUnited States
timeFull-time
remoteRemote
seniorityNew Grad, Entry Level

Mozilla Corporation is a non-profit-backed technology company known for its pioneering brands like Firefox. The Software Engineer, DOM Core will improve the DOM and HTML capabilities of the Web engine, focusing on performance and standards correctness while collaborating with a distributed team.

Browser ExtensionsInternetOpen SourceSoftwareWeb Browsers
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Comp. & Benefits
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H1B Sponsor Likelynote

Responsibilities

Improve the DOM, HTML, editing, user interaction capabilities of our Web engine, with a focus on performance, Web compatibility, and standards correctness
Read and implement API specifications, as well as contributing to the standards process by raising issues or participating in discussions
Develop and debug in a multi-language, multi-threaded and multi-process code base
Work primarily in C++ and write tests largely with HTML and JavaScript. You will learn on the job!
Collaborate with a geographically distributed development team. Working in the open is the norm

Qualification

C++JavaScriptHTMLMulti-process architectureDebugging memory usagePerformance profilingCSSLearning new toolsProblem-solvingCollaboration

Required

Proficiency in and experience developing software in C++
Ability to learn a large and complex code base quickly
Comfortable contacting people and driving discussions
Motivated to learn new tools and techniques for improving existing software
Familiarity with one or more of the following, or ability to pick them up in a timely manner: Multi-process architecture, Debugging memory usage or performance profiling, The modern Web technologies (JavaScript, HTML, and/or CSS)

Benefits

Generous performance-based bonus plans to all eligible employees - we share in our success as one team
Rich medical, dental, and vision coverage
Generous retirement contributions with 100% immediate vesting (regardless of whether you contribute)
Quarterly all-company wellness days where everyone takes a pause together
Country specific holidays plus a day off for your birthday
One-time home office stipend
Annual professional development budget
Quarterly well-being stipend
Considerable paid parental leave
Employee referral bonus program
Other benefits (life/AD&D, disability, EAP, etc. - varies by country)

Company

Mozilla

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Mozilla provides internet solutions and offers firefox, thunderbird, and raindrop.
dateFounded in 1998
location
Mountain View, California, USA
people-size501-1000 employees
web-link
https://www.mozilla.org

H1B Sponsorship

Mozilla has a track record of offering H1B sponsorships. Please note that this does not guarantee sponsorship for this specific role. Below presents additional info for your reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (2)
2024 (5)
2023 (4)
2022 (3)
2021 (2)
2020 (6)

Funding

Current Stage
Late Stage
Total Funding
$2.3M
Key Investors
AOL
2005-01-01Angel· $0.3M
2003-07-15Series Unknown· $2M

Leadership Team

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John Shaughnessy
Manager, Engineering and Ecosystem Strategy
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Recent News

Mashable
In Memoriam: All the tech that died in 2025
2025-12-31
Digital Trends
Firefox AI kill switch is coming, but you’ll wait until 2026
2025-12-24
TechSpot
Firefox will add an AI "kill switch" after community pushback
2025-12-21
Company data provided by crunchbase