Senior Software Engineer, Privacy

Mozilla; United Kingdom; Remote; GBP 90,000 - 125,000; Full time

Benefits offered by this job

Home office stipend

Development budget

Well-being stipend

Birthday leave

Parental leave

Employee referral program

Job summary

Mozilla is seeking a Senior Software Engineer to advance privacy protections and the Firefox Web Platform. You will contribute to anti-tracking features, threat intelligence, and core browser architecture within a distributed team.

The role emphasizes building performant C++, JavaScript, and Rust code, with emphasis on memory safety and multi-threaded design. Remote UK/Europe work options are available, supporting the open web mission.

Qualifications

• Bachelor's degree in computer science, engineering, or equivalent work experience.
• At least 4 years of experience with programming in C++ and Rust, with a strong background in memory safety, multi-threaded system architecture, or raw data stream manipulation.
• Proven ability to onboard quickly, deliver and improve complex software projects.
• Proven track record of independently scoping and landing complex features within tight release windows.
• Excellent written and verbal communication skills.

Responsibilities

• Implement Privacy-improving, anti-tracking and threat intelligence protection into the Firefox web browser to mitigate user tracking and phishing.
• Implement architectural improvements into Gecko, the browser engine underlying Firefox.
• Build performant, low-latency, and maintainable C++, JavaScript and Rust code
• Work as part of a geographically distributed team in an asynchronous manner (mostly Europe and US-East).

Skills

C++

Rust

Python

SQL

Memory safety

Multithreading

Privacy

Education

Bachelor's degree in CS or related field

Tools

Git

Linux

CI/CD

Job description

Senior Software Engineer, Privacy

at Mozilla Corporation Team: Firefox Locations: Remote UK, Remote Finland, Remote Germany, Remote France, Remote Sweden, Remote Netherlands, Remote Spain, Remote Belgium

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:

Are you passionate about Privacy Protections and the Open Web? Do you want to ship software to a large user base? Do you want your contributions to have a positive impact on the world? Do you want to advance current browser architecture to make the web a safer place for users?

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 restricted. We are looking for a Senior Software Engineer to support the Privacy Team to advance the Firefox Web Platform.

What you'll do:

• Implement Privacy-improving, anti-tracking and threat intelligence protection into the Firefox web browser to mitigate user tracking and phishing.
• Implement architectural improvements into Gecko, the browser engine underlying Firefox.
• Build performant, low-latency, and maintainable C++, JavaScript and Rust code
• Work as part of a geographically distributed team in an asynchronous manner (mostly Europe and US-East).

What you'll bring:

• Bachelor's degree in computer science, engineering, or a related program; or equivalent work experience.
• At least 4 years of experience with programming in C++ and Rust, with a strong background in memory safety, multi-threaded system architecture, or raw data stream manipulation.
• Proven ability to onboard quickly, deliver and improve complex software projects.
• Proven track record of independently scoping and landing complex features within tight release windows.
• Excellent written and verbal communication skills. You can validate your progress and decisions and communicate them clearly.

Bonus Points:

• You have already contributed to the Mozilla mission and the codebase.
• Experience working within the browser space (Gecko, Chromium, WebKit) or web engine runtime abstractions.
• Experience or high interest in designing or leveraging ML pipelines to automate internal developer workflows.
• Deep understanding of web architecture, the privacy/security model of the web, and client-side data structures.
• Knowledge of basic statistical modeling.
• Proficiency with Python and SQL.

What you’ll get:

• Generous performance-based bonus plans to all eligible employees - we share in our success as one team
• 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)