Senior Software Engineer - Firefox Enterprise

Mozilla Remote

Company

Mozilla

Location

Remote

Type

Full Time

Job Description

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 Enterprise team is a cross-disciplinary team in charge of improving and maintaining Firefox support for large Enterprise deployments. As part of the team you will be responsible for all things related to OS integration - such as updates installs and integrating Firefox with the different operating systems - 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.

A Senior Software Engineer contributes to architectural discussions and driving feature development within a team. At Mozilla Senior Engineers are expected to work independently on scoped projects collaborate closely with peers and play a key role in delivering high-quality software that aligns with team goals.

What You'll Get To Do:

  • Develop innovate and ship the next experience of Firefox through improved integration with the operating system.

  • Improve the ease of use and security of Firefox in large deployments by developing better administration and monitoring tools.

  • Improve Firefox functionality by better integration with remote services.

  • Assess what work supports the team and product roadmap and make insightful recommendations in regards to priorities.

  • 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 Bring

  • Experience with systems programming on a major desktop platform (Windows macOS or Linux).

  • A solid understanding of C/C++ and some knowledge of Rust.

  • A solid understanding of JavaScript and typical interactions with the backend (services REST ... )

  • 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 some low level systems programming such as Win32 APIs on Windows Cocoa APIs on macOS or GTK on Linux.

  • 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)

About Mozilla

Mozilla exists to build the Internet as a public resource accessible to all because we believe that open and free is better than closed and controlled. When you work at Mozilla you give yourself a chance to make a difference in the lives of Web users everywhere. And you give us a chance to make a difference in your life every single day. Join us to work on the Web as the platform and help create more opportunity and innovation for everyone online.

Commitment to diversity equity inclusion and belonging

Mozilla understands that valuing diverse creative practices and forms of knowledge are crucial to and enrich the company’s core mission.  We encourage applications from everyone including members of all equity-seeking communities such as (but certainly not limited to) women racialized and Indigenous persons persons with disabilities persons of all sexual orientations gender identities and expressions.

We will ensure that qualified individuals with disabilities are provided reasonable accommodations to participate in the job application or interview process to perform essential job functions and to receive other benefits and privileges of employment as appropriate. Please contact us at [email protected] to request accommodation.

We are an equal opportunity employer. We do not discriminate on the basis of race (including hairstyle and texture) religion (including religious grooming and dress practices) gender gender identity gender expression color national origin pregnancy ancestry domestic partner status disability sexual orientation age genetic predisposition medical condition marital status citizenship status military or veteran status or any other basis covered by applicable laws.  Mozilla will not tolerate discrimination or harassment based on any of these characteristics or any other unlawful behavior conduct or purpose.

Group: D

#LI-REMOTE

Req ID: R2942

Hiring Ranges:

Remote UK

£65000—£95000 GBP

Apply Now

Date Posted

12/04/2025

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