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Senior Software Engineer, Firefox Security

UK🌐 Remote💼 Full-time💰 $66,000–$66,000🗓 2026-07-28 → 2026-09-26

Core

Advance Firefox's security architecture and cryptography stack, including cryptographic protocols, WebPKI, and security-sensitive web APIs.

Role type

Senior IC security engineer (browser/cryptography)

Builds

Firefox browser security features and web platform security implementations

Domain

Internet security, cryptography, browser engineering

Deliverable

production ML models | product features

Required skills

C/C++, cryptographic protocols, WebPKI, multi-threaded systems programming, debugging, memory optimization, Rust

Preferred skills

Web platform technologies, large codebase navigation

Technologies

C, C++, Rust, WebPKI

Responsibilities

Contribute to improvements in Firefox's core security systems; Design and implement web platform security features; Investigate and resolve issues impacting stability, correctness, and performance; Collaborate on security initiatives across teams; Participate in technical design and planning for security-related initiatives

Seniority

Senior, hands-on IC

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