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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.

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, fine-tune, evaluate, and deploy LLM-driven, user-facing browser features using RAG, embeddings, prompt engineering, and modern ML tooling. Lead end-to-end model lifecycle, run production experiments, collaborate with product and engineering, and document and review work with an emphasis on privacy, latency, and usability.

Lead the Web Applications engineering team for hosted subscription products: manage people and budget, drive delivery and release readiness, improve engineering practices (CI/CD, testing, observability), ensure reliability, privacy, and cross-functional coordination.

Lead and manage the Web Applications engineering team for hosted subscription products. Drive day-to-day execution, people management, budgeting, delivery planning, and engineering practices (CI/CD, testing, observability, release readiness, reliability, security/privacy). Coordinate launches, cross-functional readiness, and improve team processes while staying hands-on with technical tradeoffs and architecture.

As a Senior Software Engineer for WebExtensions, you'll implement and maintain APIs, debug issues, collaborate with teams, and support extension developers in Firefox.

As a Senior Software Engineer for the WebExtensions platform, you will implement and maintain APIs, debug extension issues, and collaborate with teams to enhance Firefox's add-ons ecosystem.

Implement and maintain WebExtensions APIs and addon management in Firefox, debug extension issues, build related UI, collaborate across teams, contribute to Mozilla-owned add-ons, support extension developers, and participate in open-source workflows (code reviews, Bugzilla/GitHub).

As a Senior Software Engineer for WebExtensions, you'll implement APIs, improve extension reliability, debug issues, and collaborate across teams while supporting extension developers.

Lead and manage the Web Applications engineering team for hosted subscription products. Drive day-to-day execution, people management, budgeting, delivery practices, release and operational readiness, reliability, privacy/security, and cross-functional coordination while remaining hands-on with technical tradeoffs and engineering processes.