Top Tech Jobs & Startup Jobs

Develop performant, standards-compliant Firefox layout and Asynchronous Pan and Zoom features across multiple platforms. Responsibilities include writing and optimizing multithreaded C, C++, or Rust code; debugging rendering and interaction issues; developing layout, graphics, algorithms, and tools; reviewing code; testing and triaging bugs; and contributing to long-term open-source projects.

Develop and optimize Firefox performance across Windows, Android, Linux, and macOS. Write code, tests, prototypes, and tooling; profile and diagnose bottlenecks; improve benchmarks; and lead performance initiatives. Collaborate across engineering teams, educate developers, drive projects to completion, own browser performance areas, and contribute to the team’s technical roadmap.

Design and implement experiments deep within browser engine subsystems, including DOM, layout, rendering, accessibility, JavaScript runtimes, and networking. Investigate browser behavior, prototype capabilities for programmatic web interaction, measure performance and correctness, profile overhead, and document results. The role requires hands-on systems engineering, browser platform expertise, large-codebase development, and collaboration on AI-agent tooling.

Build and ship full-stack features, integrations, and enterprise customizations for an open-source AI product. Work directly with technical partners and enterprise customers on deployments, pilots, troubleshooting, infrastructure, identity, integrations, and data access. Generalize customer needs into reusable product capabilities, maintain customizations, document deployment processes, and provide roadmap feedback. The role requires strong communication, independent execution, and experience supporting AI-enabled applications in enterprise environments.

Lead semi-monthly payroll processing for approximately 800 U.S. and Canadian employees. Ensure compliance with federal, state, provincial, and local tax regulations; resolve payroll issues; coordinate benefits deductions and external vendors; support year-end filings, audits, and reporting; improve payroll processes; and mentor a Payroll Administrator.

The Senior Financial Analyst will manage forecasting, monthly budget updates, variance analysis, close support, headcount tracking, vendor and cloud spend monitoring, and reporting for Mozilla’s Core Services organization. The role partners with Accounting, People, hiring managers, budget owners, and technical teams; maintains planning data in Pigment; explains financial drivers; and improves recurring finance processes through automation and AI-assisted workflows.

Lead semi-monthly U.S. and Canadian payroll for approximately 800 employees, ensuring accurate processing and compliance with federal, state, provincial, and local regulations. Resolve payroll issues, coordinate benefits deductions and vendors, manage year-end tax filings and audits, provide reporting and analysis, improve payroll processes, and mentor a Payroll Administrator.

Prepare Core Services forecasts, monthly budget updates, variance analyses, and close reconciliations. Maintain headcount, vendor, purchase order, cloud spend, and commitment tracking. Partner with Accounting, People, hiring managers, budget owners, and technical teams to resolve issues and explain financial drivers. Improve recurring finance processes through automation and AI while delivering accurate reporting under competing deadlines.

Monitor, investigate, and respond to global security incidents; lead incident response as an incident commander; develop security alerts, playbooks, automated actions, and escalation workflows; conduct threat hunting and threat intelligence research; improve detection, containment, and post-incident processes; collaborate with stakeholders; and participate in an on-call rotation.

Leads architecture and development of Thunderbird’s web-based Services products, including calendar and secure file storage offerings. Responsibilities include writing code, prototyping, selecting technologies, developing analytics and infrastructure, solving complex problems, guiding product direction, mentoring engineers, and improving scalability and sustainability. The role collaborates across engineering, product, design, QA, Mozilla, and open-source communities in a fully remote environment.