Jobs at Mozilla

Build and improve Firefox WebCompat internal dashboards, reporting tools, and broken-site screenshot capture pipelines. The role involves creating reliable data views for triage and metrics, automating screenshot workflows, collaborating with WebCompat and QA teams, and translating reporting needs into effective tooling. Familiarity with WebCompat workflows, Bugzilla, screenshot automation, and machine learning is preferred.

Implement and ship approved UX improvements for Firefox screen, window, and tab sharing. Build accessible, tested, and localizable browser UI in a large codebase; collaborate with UX and QA, support testing with web conferencing services, and contribute through public code review. The role requires production front-end experience with JavaScript, HTML, and CSS, automated UI testing, rapid onboarding to mature codebases, and effective asynchronous communication.

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.

Maintain and improve Firefox Graphics code covering rendering, compositing, images, canvas, and WebGL. Diagnose and fix cross-platform graphics issues, resolve bugs and regressions, maintain tests, review code, and manage incoming issues. The role requires strong C++ or Rust skills, graphics framework and GPU architecture knowledge, multithreaded debugging and optimization ability, and independent technical leadership in a mature codebase.

Maintains and improves Firefox’s Layout code across CSS, page layout, APZ, text, and images. Responsibilities include fixing bugs and regressions, keeping tests green, diagnosing cross-platform issues, conducting code reviews, handling routine upkeep, and participating in planning and web-compatibility meetings. The role requires independent technical leadership in a large, mature, multithreaded C++ codebase.

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.

Leads the architecture, reliability, scaling, and evolution of hybrid-cloud and workplace infrastructure. Designs and operates production systems across data centers, offices, and cloud environments; drives migrations, automation, monitoring, incident response, and infrastructure improvements. Collaborates across IT, SRE, security, and service-owner teams, provides technical direction, mentors engineers, documents systems, and remains hands-on with critical implementations.

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.

Designs and improves large-scale data processing systems and GCP workflows using Dataflow, BigQuery, Pub/Sub, GKE, and Airflow. Evaluates technologies, establishes engineering standards, leads cross-functional data projects, develops data abstractions with Data Science, mentors engineers, and supports evolving data products.

Own full-stack product engineering for Thunderbolt, an open-source enterprise AI platform. Translate user, partner, and enterprise requirements into AI-powered chat, search, research, automation, administration, integrations, and workflow features. Lead work from concept through launch, adoption measurement, and iteration while balancing usability, reliability, security, maintainability, and enterprise needs. Collaborate with product, design, engineering, enterprise teams, open-source contributors, and technical leadership to establish reusable patterns and ship high-quality software.

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 functional prototypes and production-quality front-end experiences for an open-source AI product. Translate ambiguous ideas, workflows, partner feedback, and enterprise needs into usable interfaces. Define interaction patterns for chat, search, automation, knowledge retrieval, and administration while improving accessibility, consistency, security, transparency, and trust. Collaborate across product, design, engineering, and enterprise teams; contribute reusable components and design-system patterns; and provide technical leadership through mentoring, experimentation, and product judgment.

Lead Mozilla’s Marketing Data Science strategy and roadmap for Firefox. Drive attribution, ROI, campaign measurement, budget optimization, causal lift testing, brand impact analysis, retention and LTV modeling, audience segmentation, reporting infrastructure, dashboards, and scalable data tools. Mentor and develop team members, partner with cross-functional data science and marketing leaders, translate complex analyses into actionable recommendations, and evaluate emerging AI tools to improve workflows and business impact.

Define and execute Firefox Desktop search strategy across Windows, macOS, and Linux. Own search roadmaps, experimentation, engagement and revenue metrics, AI-powered search experiences, partner commitments, and cross-functional delivery. Balance user experience, privacy, technical constraints, and business outcomes while collaborating with Engineering, Design, Research, Data Science, and Business Development.

Develop and optimize Firefox across platforms by writing code and tests, profiling bottlenecks, improving performance-critical systems, and shaping benchmarks and team strategy. The role uses C++ and JavaScript primarily, with Kotlin, Rust, and Python, while collaborating across engineering teams, mentoring developers, and driving performance initiatives from high-level objectives to completion.

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 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.

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.

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.

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.