Senior Staff Software Engineer, Browser – New Products

🕒 October 9

🇺🇸 United States – Remote

💵 $166k - $260k / year

⏰ Full Time

🟠 Senior

🧑‍💻 Full-stack Engineer

🦅 H1B Visa Sponsor

This company has sponsored H1B visas in the past.

👻 Ghost score 0%

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Mozilla

WebsiteLinkedInAll Job Openings

501 - 1000 employees

Founded 1998

👥 B2C

🔒 Cybersecurity

B2C • Cybersecurity • Software

Mozilla is a non-profit organization dedicated to promoting an open and accessible internet. They are the makers of the popular Firefox browser, which emphasizes user privacy, speed, and control. Mozilla also offers a range of products that focus on internet security and privacy, including Mozilla VPN, Firefox Relay, and Mozilla Monitor. Additionally, the organization is involved in open-source projects, AI innovation, and advocating for digital rights. Mozilla aims to empower users with trustworthy technology and policies that protect privacy, support open-source AI development, and foster accountability for tech companies.

📋 Description

• Design and implement experiments within browser engine subsystems • Investigate how internal data structures and execution behavior affect performance, correctness, and developer-tool interfaces • Evaluate ways to represent and expose browser state efficiently and accurately • Identify tradeoffs involving information loss, implementation complexity, and compatibility with dynamic web content • Prototype engine capabilities supporting reliable programmatic interaction with web content • Investigate how document structure, layout, navigation, and event handling affect correctness and performance • Instrument browser behavior and evaluate changes against repeatable tasks • Measure performance and correctness, isolate each change's effect, and document successful and unsuccessful experiments • Validate that gains hold beyond prototype-development workloads • Profile overhead introduced by new capabilities and pursue measurement-backed improvements • Use AI tools to accelerate coding and analysis, verifying output through debugging, tests, and measurement • Work closely with the team's technical lead as a hands-on individual contributor

🎯 Requirements

• Deep 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 proficiency in C++ or Rust • Experience navigating a large systems codebase • Practical knowledge of memory ownership, concurrency, object lifetimes, and performance debugging • Ability to build JavaScript and scripting tools to exercise and measure work • Ability to investigate unfamiliar code, form precise hypotheses, construct useful prototypes, and interpret results • Strong understanding of web platform behavior and compatibility • Experience with profiling, tracing, regression tests, or conformance tests • Curiosity about AI agents and willingness to work directly with agent harnesses and coding tools • Contributions to Gecko, Servo, Blink, WebKit, or another browser engine are nice to have • Experience maintaining an open-source project is nice to have • Technical leadership in a small team building a new product is nice to have • Experience with accessibility infrastructure, browser security, profiling, or automated evaluation of agent workflows is nice to have

🏖️ Benefits

• Generous performance-based bonus plans for all eligible employees • Rich medical, dental, and vision coverage • Generous retirement contributions with 100% immediate vesting • Quarterly all-company wellness days • Country-specific holidays plus a birthday day off • One-time home office stipend • Annual professional development budget • Quarterly well-being stipend • Considerable paid parental leave • Employee referral bonus program • Life/AD&D, disability, EAP, and other benefits varying by country