66K–88K EUR / year
Senior Software Engineer, Firefox Security
BackendRemote — Netherlands
Published on 2026-10-15
These details were extracted automatically from the original listing. They may not be complete or fully up to date — it's worth checking the original job post.
About this role
Build and ship security and hardening features for Firefox, with a focus on enterprise users. Improve browser security across operating systems while helping resolve reliability, performance, and memory issues in a complex native application.
About the company
Mozilla builds open-source products and technologies, including Firefox, that prioritize privacy, security, and an open internet.
Stack
CC++RustHTMLCSSJavaScript
What you'll do
- Design, implement, test, and ship Firefox security and hardening features
- Improve security architecture, including privilege isolation, trust boundaries, cryptographic protocols, WebPKI, and security-sensitive web APIs
- Investigate security issues across teams and deliver maintainable fixes
- Diagnose and resolve stability, correctness, performance, and memory issues in a multithreaded, cross-platform application
What we're looking for
- 3+ years of low-level software engineering experience
- Strong proficiency in C and/or C++ and a solid understanding of security fundamentals
- Experience debugging multithreaded, cross-platform native applications, including memory and performance issues
- Familiarity with web technologies and ability to work in large, complex, multi-language codebases
- Experience collaborating with distributed teams and communicating technical ideas clearly
Nice to have
- Interest or experience in Rust
Benefits
- Performance-based bonus plan
- Retirement contributions with immediate vesting
- Quarterly company wellness days
- Country-specific holidays and a day off for your birthday
- One-time home office stipend
- Annual professional development budget
- Quarterly well-being stipend
- Paid parental leave