Sr. Staff Software Engineer, Browser (New Products)

Devconnectplatform; United States; Remote; USD 180,000 - 240,000; Full time

Job summary

Mozilla is seeking a Sr. Staff Software Engineer for Browser (New Products), a remote full-time role spanning the US and Canada. You will lead experiments inside browser engine subsystems, prototype reliability-enhancing features, and measure outcomes with benchmarks and profiling.

A hands-on senior IC with strong C++ or Rust and deep browser knowledge will thrive in a large codebase. You\'ll work with AI tools extensively while validating results through rigorous testing and measurement,

Qualifications

• Deep experience in at least one browser subsystem
• Strong C++ or Rust
• Comfort in a very large codebase
• Solid grasp of how the web platform behaves
• Interest in AI agents and tooling

Responsibilities

• Design and build experiments in engine subsystems (DOM, layout, accessibility, JS runtime, networking) inside browser engine internals
• Prototype features that enable programs to interact with web pages reliably
• Measure performance with repeatable benchmarks and profiling overhead
• Document and share results from experiments, including those that didn\'t work as expected
• Use AI tools heavily, but verify outputs by testing and measuring

Job description

# Sr. Staff Software Engineer, Browser (New Products)MozillaSalary not statedFull-timeremote· leadUS CanadarustListed via Hacker News · posted 2 Nov 2026. The application happens there, not on DevConnect.Apply on the company site## DescriptionMozilla | Sr. Staff Software Engineer, Browser (New Products) | REMOTE (US or Canada) | Full-timeMozilla's New Products group is a small team building new things on top of browser engine technology. We're hiring a hands-on, senior IC to run experiments inside browser engine internals and find out which ideas actually hold up.What you'd do: design and build experiments in engine subsystems (DOM, layout, accessibility, JS runtime, networking), prototype features that let programs interact with web pages reliably, and measure everything. That means repeatable benchmarks, profiling overhead, and writing up the experiments that didn't work too. You'll use AI tools heavily, but you'll verify what they produce by testing and measuring it.You likely have: deep experience in at least one browser subsystem, strong C++ or Rust, comfort in a very large codebase, a solid grasp of how the web platform behaves, and a real interest in AI agents and their tooling. Contributions to Gecko, Servo, Blink or WebKit are a big plus.US: https://job-boards.greenhouse.io/mozilla/jobs/8265116Canada: https://job-boards.greenhouse.io/mozilla/jobs/8265117