OS Integration: Windows Senior Software Engineer
Company: Mozilla
Location: Campbell
Posted on: January 18, 2026
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Job Description:
Mozilla Corporation is the non-profit-backed technology company
that has shaped the internet for the better over the last 25 years.
We make pioneering brands like Firefox, the privacy-minded web
browser. Now, with more than 225 million people around the world
using our products each month, we’re shaping the next 25 years of
technology and helping to reclaim an internet built for people, not
companies. Our work focuses on diverse areas including AI, social
media, security and more. And we’re doing this while never losing
our focus on our core mission – to make the internet better for
people. The Mozilla Corporation is wholly owned by the non-profit
501(c) Mozilla Foundation. This means we aren’t beholden to any
shareholders — only to our mission. Along with thousands of
volunteer contributors and collaborators all over the world,
Mozillians design, build and distribute open-source software that
enables people to enjoy the internet on their terms. About this
team and role: The OS Integration team ensures Firefox and other
Gecko-based products harmonize well with the host operating system
and environment. We work on components of Firefox including, but
not limited to, native crash reporting, OS abstraction layers,
platform-specific features, sandboxing and hardening. We’re a
distributed team with expertise in Windows, macOS, and Linux-based
operating systems. In this role, you will be a member of the OS
Integration team specializing in the Windows platform. What you’ll
do: • Improve the quality of Firefox on Windows by developing fixes
and improvements, improving the user experience for hundreds of
millions of users. • Help develop and ship major new Firefox
features on Windows. • Work on cross-platform features and projects
for other platforms such as macOS, Linux, and Android as needed. •
Collaborate with other teams by providing code review and technical
direction. • Work with a geographically-distributed development
team. What you’ll bring: • A degree in Computer Science or a
related field or comparable work experience. • A solid
understanding of C and C++. • Demonstrated experience with
low-level systems programming on Windows. • Knowledge of web
technologies such as Javascript, HTML, and CSS. • Strong
problem-solving and debugging skills. • Written and verbal
communication skills with a collaborative mindset. • Willingness to
work effectively in a distributed team environment. • Commitment to
our values: • Welcoming differences • Being relationship-minded •
Practicing responsible participation • Having grit What you’ll get:
• 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)
Keywords: Mozilla, San Jose , OS Integration: Windows Senior Software Engineer, IT / Software / Systems , Campbell, California
