Senior Software Engineer, Privacy

Mozilla

. Implement privacy-improving, anti-tracking and threat intelligence protection into the Firefox web browser to mitigate user tracking and phishing.

Posted 10/22/2026full-timeRemote • United KingdomSenior💰 £66,000 - £87,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in implementing privacy-improving features and architectural enhancements in web browsers, with strong capabilities in C++, Rust, and JavaScript. Proven ability to deliver complex software projects independently while communicating effectively within a distributed team.

Highest-signal resume keywords

C++ ProgrammingRust ProgrammingMemory SafetyMulti-Threaded System ArchitectureWeb Architecture

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

C++RustJavaScriptMemory SafetyMulti-Threaded SystemsData Stream ManipulationStatistical ModelingPythonSQL

Soft Skills

Excellent Communication SkillsIndependent Problem Solving

Tools & Technologies

GeckoWebKitChromium

Certifications & Qualifications

Bachelor's Degree in Computer Science

Industry Keywords

Privacy ProtectionThreat IntelligenceUser TrackingPhishing MitigationWeb Security

Tech Stack

Tools & technologies

JavaScriptPythonRustSQLC++

About the role

Key responsibilities & impact

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.

Requirements

What you’ll need

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

Benefits

Comp & perks

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)