Jobs at Mozilla

Lead full‑stack development and reliability improvements for the Firefox Add‑ons ecosystem, building features, automated moderation pipelines, reviewer tools, and observability. Improve platform reliability, respond to incidents, and help keep the ecosystem safe and trustworthy. Collaborate across design, product, QA, and community contributors and contribute openly through PRs and code reviews.

Lead and mature Mozilla's ISMS and compliance programs (ISO 27001, SOC 2), support audit execution and evidence collection, manage policy lifecycle, track remediation and internal audits, and partner with cross-functional teams to translate compliance requirements into practical controls and processes.

Build and maintain scalable release automation and CI/CD pipelines to run tens of thousands of build/test/release tasks daily. Improve developer experience, optimize cloud-based build resources, collaborate with distributed teams, perform code reviews, and respond to critical service outages during normal working hours.

Work on Firefox security architecture and cryptography stack, implement and maintain WebPKI and security-sensitive web APIs, design and ship web platform security features, debug and improve multi-threaded browser performance and memory, collaborate across teams on security initiatives, and contribute to technical design and planning.

Own and scale Mozilla's web bug bounty program; triage and validate reports; drive end-to-end remediation with engineering teams; perform targeted code reviews (JavaScript, Python); collaborate with SIRT on incidents and post-incident reviews; build tooling and metrics to improve triage, automation, and program insights.

Execute digital marketing activities to grow Thunderbird's brand and users: create and publish social, blog, and email content; manage campaign calendars; track and report metrics; support email automation, surveys, and cross-functional campaign execution; and ensure consistent brand messaging.

Lead hands-on engineering execution and people management for Thunderbolt, defining production readiness, release discipline, and engineering practices for an enterprise-ready open-source AI product across desktop, web, and mobile.

The Front End Engineering Manager will lead a distributed team, driving improvements to the Firefox Desktop experience, managing multiple projects, and ensuring quality software delivery while fostering an inclusive team environment.

Lead high-impact analytical work partnering with senior executives to turn ambiguity into data-driven strategy. Design sophisticated analyses on large-scale data, mentor data science teams, build cross-functional trust, and deliver rigorous, decision-ready recommendations that influence long-term product and business strategy.

The Staff Data Scientist will own the analytical strategy for Firefox, driving data-informed decisions through measurement frameworks, experiments, and user growth analysis, while mentoring other data scientists.

Work on Firefox's accessibility engine (Gecko) to improve architecture, stability, performance, and platform integration. Debug multi-process, multi-threaded and OS-specific issues, build tests and prototypes, collaborate with cross-functional teams, influence web accessibility standards, and engage with the open-source community to make web content accessible to all users.

The Staff Data Scientist will lead analytical strategies for Firefox, focusing on product growth, measurement frameworks, and mentoring data scientists while guiding data-driven decisions.

Design, build, and maintain scripts, APIs, integrations and agentic AI workflows for workplace systems (collaboration tools and identity platforms). Implement monitoring, automate onboarding/offboarding and access provisioning, troubleshoot reliability and security issues, document shared libraries, and partner across IT, Security, and People teams to improve user experience and scalability.

Design, develop, and maintain Thunderbird's iOS app with a focus on performance, reliability, security, accessibility, and scalability. Own projects end-to-end, debug and test across unit/integration/automation, review code, reduce technical debt, document architecture, and collaborate with product, UX, and the open-source community.

Lead product strategy and execution to build a new PC gaming product and business from the ground up. Own market research, product vision, go-to-market, metrics, and roadmaps; manage cross-functional design and engineering teams; drive product-market fit and growth; represent the product externally and align stakeholders across Mozilla leadership and partners.

Lead customer and partner go-to-market for a new browser automation platform. Identify design partners, build pipeline, run discovery and technical sales cycles, drive LOIs/POCs/pilots to commercial contracts, and shape integrations and product roadmap through close engineering partnership.

Develop and improve Firefox installs, updates, and OS integrations (Windows/macOS). Implement platform-specific features, fix complex bugs, participate in code reviews, and collaborate with a distributed team to deliver high-quality browser experiences.

Lead backend development and own services end-to-end: design, build, deploy, operate, monitor, and troubleshoot production systems. Collaborate with frontend, CloudEng, product, and design; participate in on-call rotations, code reviews, security/privacy reviews, and mentor junior engineers to maintain reliability and quality.

Lead and mentor a software engineering team building privacy-respecting Ads (Firefox Suggest) backend services, partner integrations, experimentation, and product-facing systems. Partner with Product, Data, Privacy, and Revenue stakeholders to deliver reliable, maintainable production software, hire and onboard engineers, and foster an inclusive, distributed team culture while balancing privacy, policy, and business constraints.

Build, maintain, and evolve Mozilla’s Internal Developer Infrastructure Platform: CI/CD, observability, Kubernetes optimization, environment bootstrapping, and cost optimization. Lead technical decisions, create Claude skills and agentic workflows to boost developer productivity, mentor teammates, write proposals, and deliver cross-functional platform features while ensuring usability, maintainability, and safe production paths.