166K–260K USD / year
Sr. Staff Software Engineer, Browser (New Products)
OtherRemote — United States
Published on 2026-10-09
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About this role
Build and evaluate browser-engine prototypes exploring new applications of browser technology. The role focuses on engine-level investigations that support reliable programmatic interaction with web content, with experiments informing the team’s technical direction.
About the company
Mozilla builds open-source products and technologies, including Firefox, that prioritize privacy, security, and an open internet.
Stack
C++RustJavaScriptGeckoServoBlinkWebKit
What you'll do
- Design and implement experiments in browser-engine subsystems.
- Evaluate approaches to representing browser state and enabling programmatic interaction with web content.
- Instrument browser behavior and measure performance and correctness against repeatable tasks.
- Profile new capabilities and document experiment results, including unsuccessful approaches.
- Use AI coding and analysis tools, verifying their output through debugging, tests, and measurement.
What we're looking for
- Deep hands-on expertise in a browser-engine subsystem, with substantial implementation experience.
- Strong C++ or Rust skills and experience navigating large systems codebases.
- Practical knowledge of memory ownership, concurrency, object lifetimes, and performance debugging.
- Ability to investigate unfamiliar code, form hypotheses, prototype, and interpret reproducible results.
- Strong understanding of web-platform behavior, compatibility, and the relationship between document structure, scripts, rendering, and interaction.
- Experience with profiling, tracing, regression tests, or conformance tests.
- Curiosity about AI agents and experience or willingness to work with agent harnesses and coding tools.
Nice to have
- Contributions to a browser engine or experience maintaining an open-source project.
- Technical leadership in a small team building a new product.
- Experience with accessibility infrastructure, browser security, profiling, or automated evaluation of agent workflows.
Benefits
- Performance-based bonus plan.
- Medical, dental, and vision coverage.
- Retirement contributions with immediate vesting.
- Quarterly company-wide wellness days and a birthday day off.
- One-time home-office stipend and annual professional-development budget.
- Quarterly well-being stipend and paid parental leave.