Senior Staff Software Engineer, Browser – New Products

This is a fully remote position, open to applicants in Canada.

📋 Description

• Design and execute experiments within the subsystems of a browser engine.

• Explore how internal data structures and execution behavior influence performance, correctness, and developer-tool interfaces.

• Assess methods for effectively and accurately representing and revealing browser state.

• Develop prototypes of engine functionalities that facilitate reliable programmatic interaction with web content.

• Analyze how document structure, layout, navigation, and event handling impact both correctness and performance.

• Instrument browser behavior and assess modifications against repeatable tasks.

• Evaluate performance and correctness, isolate the impacts of changes, and document both successful and unsuccessful experiments.

• Ensure that performance gains persist beyond prototype-development workloads.

• Profile the overhead introduced by new capabilities and strive for measurement-supported enhancements.

• Utilize AI tools to expedite coding and analysis, validating output through debugging, testing, and measurement.

• Collaborate closely with the team’s technical lead while functioning as an active individual contributor.

⛳️ Requirements

• In-depth hands-on knowledge of at least one browser engine subsystem, such as DOM and Web APIs, layout and rendering, accessibility, JavaScript runtimes, or networking and process architecture.

• Strong skills in C++ or Rust programming languages.

• Experience with navigating a large systems codebase.

• Practical understanding of memory ownership, concurrency, object lifetimes, and performance debugging.

• Capability to create JavaScript and scripting tools for testing and measurement purposes.

• Ability to analyze unfamiliar code, develop precise hypotheses, construct useful prototypes, and interpret the results.

• Solid understanding of web platform behavior and compatibility.

• Experience with profiling, tracing, regression tests, or conformance tests.

• Curiosity about AI agents and a willingness to engage directly with agent harnesses and coding tools.

• Contributions to Gecko, Servo, Blink, WebKit, or another browser engine are considered a plus.

• Experience in maintaining an open-source project is also a plus.

• Technical leadership experience in a small team creating a new product is advantageous.

• Familiarity with accessibility infrastructure, browser security, profiling, or automated evaluation of agent workflows is beneficial.

🏝️ Benefits

• Generous performance-based bonus plans for all eligible employees.

• Comprehensive medical, dental, and vision coverage.

• Significant retirement contributions with 100% immediate vesting.

• Quarterly all-company wellness days.

• Country-specific holidays and an additional day off for birthdays.

• One-time stipend for home office setup.

• Annual budget for professional development.

• Quarterly stipend for well-being expenses.

• Considerable paid parental leave.

• Employee referral bonus program.

• Additional benefits including life/AD&D, disability, and EAP, varying by country.