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.

Benefits

- 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.

📌 Senior Software Engineer, Privacy (España)
🏢 Mozilla
📍 España