Responsibilities

Implement privacy-improving, anti-tracking, and threat-intelligence protections in Firefox to mitigate tracking and phishing.
Implement architectural improvements to Gecko, the browser engine underlying Firefox.
Build performant, low-latency, and maintainable C++, JavaScript, and Rust software.
Independently scope, deliver, and improve complex features within tight release windows.
Work asynchronously with a geographically distributed team and communicate technical decisions clearly.

Requirements

Bachelor’s degree in computer science, engineering, or a related program, or equivalent work experience.
At least 4 years of experience programming in C++ and Rust.
Strong background in memory safety, multithreaded system architecture, or raw data-stream manipulation.
Proven ability to onboard quickly and deliver complex software projects.
Excellent written and verbal communication skills.
Preferred: experience with Gecko, Chromium, WebKit, or web-engine runtime abstractions.
Preferred: experience or strong interest in ML pipelines for internal developer workflows, web architecture, web privacy and security models, client-side data structures, statistical modeling, Python, and SQL.

Performance-based bonus plans for eligible employees.
Retirement contributions with immediate 100% vesting.
Quarterly company wellness days, country-specific holidays, and a birthday day off.
One-time home-office stipend and annual professional-development budget.
Quarterly well-being stipend and paid parental leave.
Employee referral bonus program and other country-dependent benefits including life/AD&D, disability, and EAP coverage.
Remote role based in Spain, with a listed hiring range of €58,000–€77,000 EUR annually.