Staff Software Engineer, Desktop Integration

Mozilla; London; Hybrid; GBP 70,000 - 90,000; Full time

Job summary

A leading non-profit-backed technology company in London seeks a Staff Software Engineer for Desktop Integration. The role involves developing Firefox features, improving security, and collaborating with a distributed team. Candidates should have strong experience in systems programming and proficiency in C/C++. Benefits include performance-based bonuses, medical coverage, and retirement contributions.

Benefits

Generous performance-based bonus plans

Rich medical, dental, and vision coverage

Generous retirement contributions

Quarterly all-company wellness days

One-time home office stipend

Annual professional development budget

Considerable paid parental leave

Qualifications

• Experience with systems programming on a major desktop platform.
• Development experience on Windows and/or macOS, particularly with low-level Win32/Cocoa API coding.
• A solid understanding of C/C++ with some knowledge of Rust.

Responsibilities

• Develop and ship the next experience of Firefox features through updates and OS integrations.
• Improve ease of use and security of Firefox in large deployments.
• Work with expert software engineers to develop your understanding of platforms.

Skills

Systems programming on major desktop platforms

C/C++ proficiency

Excellent communication skills

Development in Windows and/or macOS

Tools

Rust

Job description

Social network you want to login/join with:

Staff Software Engineer, Desktop Integration, London

Client:

Location: London, United Kingdom

Job Category: Other

-

EU work permit required: Yes

Job Reference: 1cbd4be8d762

Job Views: 15

Posted: 12.08.2025

Expiry Date: 26.09.2025

Job Description:

Staff Software Engineer, Desktop Integration

at Mozilla Corporation

Team: New Products

Locations: Remote Germany, Remote France, Remote UK

To learn the Hiring Ranges for this position, please select your location from the Apply Now dropdown menu.

To learn more about our Hiring Range System, please click this

Why Mozilla?

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 Firefox team is a community of engineers who care deeply about delivering the fastest, friendliest, most usable browser possible. We are responsible for making the things you see in the browser work securely, quickly, and well! The desktop team is a multi-functional team that focuses on updates, installs and integrating Firefox with different OS platforms. As part of the team, you will be responsible for all things related to OS integration and helping us grow our user base.

Our team is geographically distributed, and working in the open is the norm. We contribute to the code driving Firefox on a number of desktop platforms - Windows, Linux, and macOS.

What is a Staff Software Engineer?

A Staff Software Engineer is the next level up from a Senior Software Engineer. At Mozilla this role can vary, but typically a staff engineer supports an engineering team, providing technical leadership, building cross-team relationships, and helping the team deliver on their objectives.

What you’ll do:

• Develop, innovate, and ship the next experience of Firefox features through installs, updates, and improved OS integrations.
• Improve the ease of use and security of Firefox in large deployments by developing better administration tools.
• Assess what work supports the team and product roadmap and make insightful recommendations in regards to priorities.
• Work with expert software engineers to further develop your understanding of the Windows, macOS and Linux platforms.
• Optimize the quality of Firefox by hunting down and fixing software defects, improving the experience of hundreds of millions of users.
• Work with a geographically-distributed development team.

What you’ll bring:

• Experience with systems programming on a major desktop platform (Windows, macOS or Linux).
• Development experience on Windows and/or macOS, particularly with low-level Win32/Cocoa API coding.
• A solid understanding of C/C++ and some knowledge of Rust.
• You are an excellent communicator and have participated effectively on a distributed team.
• You’re pragmatic about how to move things forward in specific timeframes including trade-offs and safeguards when implementing new functionality.
• Experience working collaboratively with product managers, project managers, and/or other non-engineering teams.

Bonus Points

• Professional programming experience in Rust.
• You have developed cross-platform desktop applications, particularly when this involves low level systems programming.
• You have previously successfully contributed to an open source project.

We value a variety of voices within our team and at Mozilla. You don't need to check every box on this list to apply.

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)