An open-source browser organizationHiring

Senior Contract C++ / JavaScript Software Engineer, Browser Engine

  • Remote, United Kingdom
  • Senior
  • Posted 9 days ago
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In one line

Contract role on a browser engine team improving session history by writing web platform tests and fixing what they catch.

About the role

Fits an engineer with browser-engine experience who likes debugging in a large mature codebase and working in the open through public bugs and review. Success means better test coverage and correctness.

At a glance

Pay
Not stated in the posting
Remote scope
Remote, United Kingdom
Seniority
Senior
Skills
JavaScript, Web Platform Tests, Gecko, Debugging
Posted
20 Oct 2026
Last checked
27 Oct 2026

What you will do

  • Write web platform tests to raise coverage, plus engine-level tests where needed.
  • Fix the failures the tests expose to improve correctness.
  • Take changes through code review with module owners and iterate until they land.

What they look for

  • Substantial work in a browser engine codebase or automating one, ideally Firefox or Gecko.
  • Solid JavaScript used for writing automated tests.
  • Proficiency developing software in C++ and strong debugging in a large mature codebase.
  • Comfort working in the open with public bugs, review and upstream landing.

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Claude

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Muse

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Message for Muse
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Prompt
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Questions about this job

Is this job fully remote, and from where?

The posting lists it as remote for people in the United Kingdom.

What does this job pay?

The posting does not state a salary, so there is no figure to quote.

What experience is needed?

It is a senior role. The posting asks for: substantial work in a browser engine codebase or automating one, ideally Firefox or Gecko; solid JavaScript used for writing automated tests; proficiency developing software in C++ and strong debugging in a large mature codebase. Skills it names include JavaScript, Web Platform Tests, Gecko, Debugging.

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