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 behavior impact performance, accuracy, and developer-tool interfaces.

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

• Create prototypes of engine capabilities that facilitate reliable programmatic interactions with web content.

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

• Instrument browser behavior and assess changes against consistent tasks.

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

• Ensure that performance gains extend beyond prototype-development tasks.

• Analyze overhead introduced by new capabilities and pursue improvements justified by measurements.

• Utilize AI tools to expedite coding and analysis, confirming outputs through debugging, testing, and measurement.

• Act as a proactive individual contributor, leading engine-level investigations and implementations alongside the technical lead.

⛳️ Requirements

• Extensive hands-on experience 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 expertise in C++ or Rust.

• Experience working with large systems codebases.

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

• Ability to develop JavaScript and scripting tools necessary for testing and measuring work.

• Capacity to investigate unfamiliar code, formulate precise hypotheses, create useful prototypes, and analyze results.

• Solid understanding of web platform behavior and compatibility, including document structure, script execution, rendering, and user interaction.

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

• Interest in AI agents and readiness to work directly with agent harnesses and coding tools.

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

• Experience in maintaining an open-source project is advantageous.

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

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

🏝️ Benefits

• Generous performance-based bonus plans for all eligible employees - we share in our success as one team.

• Comprehensive medical, dental, and vision coverage.

• Significant retirement contributions with 100% immediate vesting (regardless of whether you contribute).

• Quarterly all-company wellness days where everyone pauses together.

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

• One-time home office stipend.

• Annual professional development budget.

• Quarterly well-being stipend.

• Considerable paid parental leave.

• Employee referral bonus program.

• Additional benefits (life/AD&D, disability, EAP, etc. - varies by country).