Jobs at Mozilla

Develop and optimize Firefox performance across Windows, Android, Linux, and macOS. Write code, tests, prototypes, and performance tooling; profile and resolve bottlenecks; improve benchmarks; and collaborate with engineering teams. The role also involves setting performance strategy, educating engineers, driving cross-functional goals, and contributing to Firefox’s open-source development.

Define and execute the strategy and roadmap for Firefox Desktop search across Windows, macOS, and Linux. Lead experimentation, metrics development, search partnerships, and cross-functional delivery of privacy-focused search and AI experiences. Balance user experience, privacy, technical constraints, and revenue objectives while driving measurable engagement and business outcomes.

Leads geographically distributed frontend engineers improving the Firefox Desktop user experience. Owns delivery of high-quality, maintainable software, manages priorities and risks, establishes engineering processes, develops team members, and collaborates with Product, UX, QA, Operations, and Data Science. The role requires frontend platform experience, strong knowledge of JavaScript or TypeScript, HTML, and CSS, and the ability to deliver sophisticated user-facing experiences.

Build and improve Mozilla’s Firefox Add-ons platform, including moderation pipelines, reviewer tools, DevHub, and full-stack features. Develop React/TypeScript frontends and Django/MySQL backends, improve reliability through Google Cloud deployments, monitoring, and incident response, and create observability and security systems. Collaborate with product, design, QA, reviewers, developers, and open-source contributors while responding to platform incidents and supporting ecosystem safety.

Diagnose and fix WebGL bugs in Gecko using C++ and Rust, including security issues. Develop and land tested fixes, participate in code reviews, manage the WebGL bug queue, and improve Firefox graphics functionality. The role requires graphics or GPU experience, strong multithreaded debugging skills, and familiarity with sandbox and IPC architectures. Browser-engine, Gecko, security research, or fuzzing experience is preferred.

Own end-to-end recruiting for complex technical, staff-level, and leadership roles. Develop advanced sourcing strategies for niche technical communities, advise senior leaders on hiring plans and organizational design, lead candidate negotiations and closing, improve recruiting workflows, apply career-level guides for consistent calibration, and build diverse long-term talent pipelines.

Build and operate Mozilla’s first B2B technical support operations capability. Own support vendors, workflows, training, capacity planning, metrics, governance, escalations, incident response, and continuous improvement. Coordinate with Product, Engineering, Customer Success, Sales, Legal, Finance, and Procurement to deliver reliable enterprise support. Translate customer and support insights into improvements across products, processes, tooling, documentation, and automation.

Leads end-to-end recruiting for complex technical, staff-level, and leadership roles. Responsibilities include advanced passive sourcing, high-stakes candidate closing and negotiation, executive stakeholder advising, recruiting process improvement, hiring calibration, leveling consistency, and long-term talent pipeline and succession planning.

Lead the architecture, reliability, and evolution of hybrid-cloud and workplace infrastructure. Design and operate scalable systems across compute, networking, DNS, identity, and data centers; drive migrations, automation, monitoring, incident response, and performance improvements. Collaborate across IT, SRE, security, and service-owner teams, provide technical direction, mentor engineers, and maintain operational documentation. Remain hands-on while influencing architecture and standards across multiple teams.

Lead data science for Mozilla’s advertising business by identifying high-impact opportunities, owning complex analyses, developing measurement and experimentation frameworks, analyzing revenue and performance, and translating findings into recommendations for technical partners and executives. Partner across Product, Engineering, Sales, Finance, and leadership to support business decisions in a fast-moving environment while balancing analytical rigor, pragmatism, and user privacy.

Leads the architecture, reliability, scaling, and evolution of hybrid-cloud, data center, networking, and workplace infrastructure. Designs and implements complex systems, drives migrations and automation, improves monitoring and operational practices, participates in incident analysis, and provides technical direction across teams. The role remains hands-on while mentoring engineers, documenting systems, and establishing infrastructure standards. Core technologies include VMware, Cisco UCS, load balancers, Linux/Unix, networking, Infrastructure as Code, and Python.

Lead data science partnership for Mozilla’s advertising business, identifying high-impact opportunities and owning complex analytics end to end. Develop measurement frameworks, experimentation strategies, instrumentation, and reporting for advertising products. Analyze revenue and performance, evaluate trade-offs, and communicate clear recommendations and uncertainty to technical teams and senior executives.

Build and maintain Mozilla’s Internal Developer Infrastructure Platform, including CI/CD, observability, Kubernetes optimization, environment bootstrapping, and cloud cost optimization. Support development teams, guide technical decisions, create platform features and agentic workflows, improve developer productivity, and promote maintainable engineering practices. The role also requires cross-functional collaboration, technical leadership, proposal writing, and resolving ambiguous infrastructure challenges.

Leads the design and development of Mozilla’s data platform, processing tens of terabytes daily. Builds GCP workflows using Dataflow, BigQuery, Pub/Sub, GKE, and Airflow; evaluates technologies; establishes engineering standards; partners with Data Science, Product, Legal, Policy, and Engineering; develops data abstractions; mentors engineers; and supports evolving data products.

Design and improve large-scale data processing and platform systems handling tens of terabytes daily. Build GCP workflows using Dataflow, BigQuery, Pub/Sub, GKE, and Airflow; evaluate technologies; establish engineering standards; lead cross-functional projects; mentor engineers; collaborate with Data Science; and develop data abstractions and active data products.

Own full-stack AI product features from concept through launch, adoption, and iteration. Translate user, partner, and enterprise needs into reliable product experiences involving AI chat, search, research, workflow automation, administration, and integrations. Build and test across front-end, back-end, APIs, and infrastructure-adjacent areas; make product and technical tradeoffs; measure adoption and reliability; and establish reusable engineering patterns. Collaborate with product, design, enterprise teams, leadership, open-source contributors, and external partners in a remote environment.

Manage a portfolio of major donors, personally solicit and close five-, six-, and seven-figure gifts, and advance relationships through cultivation, solicitation, and stewardship. Maintain accurate Salesforce records, identify and qualify prospects, develop tailored proposals and impact stories, deliver stewardship activities, and partner with executives, program staff, and prospect research. The role also supports donor renewal, increased giving, annual-to-major gift pathways, and consistent revenue growth.

Build and own full-stack AI product features from concept through launch, adoption, and iteration. Translate user, partner, product, and enterprise requirements into reliable experiences for AI chat, search, research, workflow automation, administration, and integrations. Collaborate across engineering, product, design, enterprise teams, and open-source contributors. Evaluate AI tooling, make technical and product tradeoffs, write maintainable tested code, measure product adoption and reliability, and establish reusable patterns for an enterprise-ready open-source platform.

Owns multi-entity accounting across nonprofit and for-profit organizations, including general ledger operations, financial close, reporting, treasury, tax coordination, audits, internal controls, reconciliations, and accounting systems. The role prepares financial statements, manages inter-company accounting, supports budgeting and forecasting, coordinates compliance and external advisors, and improves scalable finance processes and systems.

Lead design-engineering for Thunderbolt by turning ambiguous AI product ideas into prototypes and production-ready front-end experiences. Build prototypes in the codebase, define AI interaction patterns, improve usability/accessibility, create reusable components and design-system elements, and partner with cross-functional teams to ensure enterprise readiness, security, and user trust.