Work on Firefox's security architecture and cryptography stack (including WebPKI and PKI evolution), design and implement web platform security features, and improve browser reliability, performance, and memory usage. Requires strong software engineering skills (C/C++), security fundamentals, debugging of multi-threaded native applications, and familiarity or interest in Rust and web technologies.

Work on Firefox's security architecture and cryptography stack (cryptographic protocols, WebPKI, security-sensitive web APIs); design and implement web platform security features; improve browser reliability, performance, and memory efficiency in a multi-threaded, cross-platform codebase. Requires strong software engineering skills with proficiency in C/C++, familiarity or interest in Rust, debugging, and security fundamentals.

Mozilla is hiring a Senior Machine Learning Engineer to conceptualize, prototype, fine-tune, evaluate, and deploy LLM-driven user-facing features in Firefox. Responsibilities include applying RAG, summarization, classification, and intent modeling, using modern ML tooling (e.g., Hugging Face, LangChain, W&B, Ray), and collaborating with product and engineering teams with attention to privacy, latency, and usability. US salary ranges listed: $139,000–$218,000 USD per year depending on location tier.

Lead day-to-day engineering execution and people management for the Web Applications team responsible for hosted subscription products. Responsibilities include managing engineers and contractors, resource and budget planning, establishing engineering processes (code review, testing, CI/CD, observability), coordinating launches and operational readiness, and ensuring quality, privacy, and reliability. Requires 15+ years industry experience (including at least 10 years engineering leadership) and US work authorization. Salary range (US): $175,000–$200,000 USD/year.

Lead day-to-day engineering execution and people management for the Web Applications team building hosted subscription services for Thunderbird. Responsibilities include managing engineers and contractors, resource and budget planning, establishing engineering processes (code review, testing, observability, CI/CD, release readiness), coordinating launches and operations, and maintaining product/architectural context. Requires strong engineering leadership with experience in hosted/SaaS services, privacy/security considerations, and overlap with EST working hours. Role is remote and does not provide visa sponsorship.

Remote (Canada) senior engineering manager role requiring 15+ years industry experience and strong engineering leadership to manage Web Services engineers and contractors, drive delivery practices, improve operational readiness, and coordinate launches for hosted subscription services. Requires overlap with EST working hours; the employer does not provide visa sponsorship.

The role will raise Mozilla and Firefox’s profile in the UK by developing and executing end-to-end public policy campaigns, engaging UK policymakers, regulators, industry groups and civil society, monitoring UK and EU regulatory developments, and advising internal product and engineering teams. Requires at least 5 years’ experience in technology policy and experience in the UK policy environment.

Remote role focused on engaging UK policymakers, regulators, industry and civil society to advocate for policy frameworks supporting the open web and Mozilla products. Responsibilities include building and delivering end-to-end policy campaigns, representing Mozilla externally, monitoring UK and EU regulatory developments, coordinating subject-matter experts, and advising internal product/engineering teams. Requires a bachelor’s degree or equivalent and at least 5 years working on technology policy with demonstrated UK policy experience.

Mozilla seeks a student worker enrolled at a German university to join the Firefox Application Security Team. The role is remote (Germany) with occasional visits to the Berlin office and involves learning team processes, investigating security issues, writing test cases (HTML/JavaScript), and working on tooling or features using Python or C++. No prior security experience is required; relevant experience in web development, Python, or systems programming is expected.

Seeking a Lead Privacy Counsel (8+ years) to operationalize privacy compliance and governance at Mozilla, including data mapping, records of processing activities, vendor privacy assessments, and incident response. The role partners with legal, security, engineering, procurement, and other teams to implement scalable privacy-by-design processes and advise on U.S., European, and international privacy and AI regulatory developments.

Remote role serving as frontline privacy counsel to design and maintain privacy compliance infrastructure (data mapping, ROPAs), operationalize global privacy governance, manage third-party privacy risk assessments (DPIAs/LIAs/TIAs), support incident response, and advise on privacy aspects of M&A. Requires J.D. (or foreign equivalent), state bar membership, and 8+ years in-house privacy and data governance experience.

Mozilla seeks a Staff Solutions Engineer (France) to partner with Sales on strategic enterprise opportunities across France. Responsibilities include technical discovery, solution design, running workshops, validating interoperability (SSO/MFA/IdP, PKI, SIEM, proxies), designing pilots and rollouts, and producing reusable technical assets. Requires 7+ years experience in solutions/sales/architecture roles, native French (c2), strong English (c1), deep enterprise security and deployment knowledge, and willingness to travel within France (preference for Paris-area candidates).

Customer-facing Staff Solutions Engineer to support Firefox Enterprise growth across France. Responsibilities include partnering with Sales, leading technical discovery and solution design, running workshops, designing and supporting pilots/POCs and rollouts, validating interoperability (SSO/MFA/IdP, SIEM, proxies, certificates/PKI, endpoint tooling), and creating reusable technical assets. Role requires 7+ years' experience, native-level French, strong English, willingness to travel within France, and experience with enterprise security, endpoint management, policy frameworks, and Kubernetes/Helm for customer environments.

Mozilla is hiring a Senior Software Engineer for the Privacy Team to implement privacy-improving, anti-tracking features and data sanitization in the Firefox web browser, and to make architectural improvements to Gecko. The role involves writing performant C++, JavaScript and Rust code, working asynchronously with a distributed team. Requires a bachelor's degree or equivalent and at least 4 years' experience with C++ and Rust, strong memory-safety and multi-threaded architecture skills. Bonus experience includes browser engines, ML pipelines, Python, SQL and statistical modeling.

Lead a geographically distributed frontend engineering team for Firefox Desktop (Windows, Linux, macOS). Own delivery, engineering processes, hiring and development; collaborate with Product, UX, QA, Operations and Data Science. Requires a software engineering background, experience delivering user-facing front-end products, and 4+ years leading engineers. Salary ranges provided for Canada (CAD).

Mozilla seeks a Senior Strategic Account Executive for Firefox Enterprise to build pipeline and close complex enterprise deals across France and Belgium. Responsibilities include full sales-cycle ownership (prospecting through close), turning interest into pilots and support agreements, partnering with Solutions Engineering, and engaging senior IT, security, procurement, and compliance stakeholders. Role is remote in France, requires travel within France and occasional alignment with U.S. business hours. Hiring range for Remote France: €144,000–€169,000 EUR per year.

Mozilla seeks a Senior Strategic Account Executive to build pipeline and close complex enterprise deals for Firefox Enterprise across France and Belgium. The role owns the full sales cycle, works closely with Solutions Engineering, engages senior IT/security stakeholders, and requires strong enterprise SaaS/infrastructure/security sales experience and fluency in French and English. Position is remote with required travel within France and occasional alignment with U.S. hours.

Temporary (6-month) role to develop and lead Mozilla's 2026 integrated brand campaign for France. Responsibilities include French market strategy, cross-functional collaboration with product/creative/media/PR/agencies, end-to-end campaign execution across owned/earned/paid channels, and measurement/reporting. Requires 8+ years of consumer/brand marketing experience and fluency in French and English.

Mozilla is hiring a Senior Strategic Account Executive for Firefox Enterprise to grow adoption across DACH (Germany, Austria, Switzerland). The role is remote and focused on developing new enterprise, regulated, and public-sector opportunities, owning the full sales cycle from prospecting to close, enabling pilots and rollouts, and partnering with Solutions Engineering and regional business development. Advanced written and verbal proficiency in German and English is required.

Mozilla is hiring a Senior Strategic Account Executive for Firefox Enterprise to develop and close enterprise opportunities across DACH. The role owns the full sales cycle—prospecting through close—partners with Solutions Engineering, and engages senior IT, security, procurement, and compliance stakeholders. Strong experience in enterprise SaaS, infrastructure, security or platform sales and fluency in English and German are required.