Mozilla
Mozilla
Mozilla is a nonprofit software and internet organization working to keep the web open, accessible, and user-focused. Best known for Firefox, Mozilla develops products such as Mozilla VPN, Firefox Relay, and Mozilla Monitor, with an emphasis on privacy, security, speed, and user control. Its work also spans open-source software, AI innovation, and digital-rights advocacy, including efforts to encourage trustworthy technology, responsible AI development, and greater accountability across the technology industry.

Senior Software Engineer, Firefox Security (Germany Remote)

Strengthen security, reliability, and performance in Mozilla Firefox by designing security features and improving browser architecture. Support enterprise users across operating systems.

Description

  • Build, test, and deliver security and hardening features for Firefox enterprise users.
  • Advance Firefox’s security architecture across operating systems, including privilege isolation and trust boundaries.
  • Improve core protections such as cryptographic protocols, WebPKI, and security-sensitive web APIs.
  • Partner across teams to investigate security issues, find root causes, and deliver maintainable fixes.
  • Resolve stability, correctness, performance, and memory issues in a complex multithreaded environment.

Requirements

  • Bring at least three years of low-level software engineering experience.
  • Demonstrate strong proficiency in C and/or C++.
  • Understand core security principles.
  • Have experience diagnosing and resolving issues in multithreaded, cross-platform native applications.
  • Have experience addressing memory and performance challenges.
  • Be familiar with HTML, CSS, and JavaScript.
  • Have an interest in or experience with Rust.
  • Work effectively in large, complex codebases spanning multiple languages.
  • Have experience collaborating with distributed teams.
  • Communicate technical ideas clearly in writing and conversation.

Benefits

  • Performance-based bonuses for eligible employees, reflecting shared team success.
  • Retirement contributions that vest immediately, whether or not you contribute.
  • Quarterly company-wide wellness days.
  • Country-specific holidays and a day off for your birthday.
  • A one-time home office stipend.
  • An annual professional development budget.
  • A quarterly well-being stipend.
  • Paid parental leave.
  • An employee referral bonus program.
  • Other benefits, including life and accidental death and dismemberment insurance, disability coverage, and an employee assistance program; offerings vary by country.

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