Senior Staff Software Engineer, Browser – New Products

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

📋 Description

• Design and execute experiments within browser engine subsystems.

• Explore how internal data structures and execution behaviors impact performance, accuracy, and developer-tool interactions.

• Assess methods for efficiently and accurately representing and exposing browser state.

• Recognize trade-offs related to information loss, implementation complexity, and compatibility with dynamic web content.

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

• Examine how document structure, layout, navigation, and event handling influence correctness and performance.

• Instrument browser behavior and analyze changes against repeatable tasks.

• Measure performance and accuracy, isolate the impact of each change, and document both successful and unsuccessful experiments.

• Ensure that performance improvements are sustained beyond prototype-development workloads.

• Analyze overhead introduced by new capabilities and seek measurement-driven enhancements.

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

• Collaborate closely with the team's technical lead as a proactive individual contributor.

⛳️ Requirements

• Extensive hands-on expertise in 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.

• Experience working with a large systems codebase.

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

• Capability to build JavaScript and scripting tools for testing and measuring work.

• Ability to investigate unfamiliar code, formulate precise hypotheses, create useful prototypes, and interpret results effectively.

• In-depth understanding of web platform behavior and compatibility.

• Familiarity 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 other browser engines are advantageous.

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

• Technical leadership experience in a small team developing a new product is a plus.

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

🏝️ Benefits

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

• Comprehensive medical, dental, and vision coverage.

• Substantial retirement contributions with 100% immediate vesting.

• Quarterly wellness days for the entire company.

• Country-specific holidays plus a day off for your birthday.

• One-time stipend for home office setup.

• Annual budget for professional development.

• Quarterly stipend for well-being.

• Ample paid parental leave.

• Employee referral bonus program.

• Life/AD&D, disability, EAP, and other benefits vary by country.