Senior Software Engineer, Accessibility
Mozilla
$137,000–$183,000
Jul 15, 2026
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Jul 21, 2026
What this job asks for AI summary
A systems-level engineering role focused on Firefox's accessibility engine within the Gecko rendering engine. The work centers on improving architecture, performance, and correctness of the a11y stack across multiple operating systems, debugging multi-process and multi-threaded code, and collaborating with design and front-end teams to address accessibility gaps. Suits a C++ developer with web accessibility knowledge and cross-platform native application experience.
Senior level · Remote · Full-time
Pay in the description: $116,000–$183,000
We read this from the posting text with AI. Skim the description below before ruling yourself out.
How this req sits in the market our data
Roughly 80,500 people nationally plausibly meet what this posting asks for (software developers). range 23,700–121,000
Applicant volume Moderate — A normal amount of company. The rare requirements below are what will separate a shortlisted application from the rest.
Most people in this occupation already list these. Still required — just not what gets you shortlisted.
What the occupation pays Median $138,970 (middle half $107,524–$175,762). This posting is about at that midpoint.
Estimated from BLS employment for this occupation and area, per-skill prevalence across our listing corpus, and published wage benchmarks — as of Jul 28, 2026. It is a model, not a headcount.
Why we read it this way (8)
The job title is simply 'developer' with no seniority modifier, so advertised seniority is Unspecified. However, the requirements — deep C++ and systems programming expertise, multi-process/multi-threaded debugging, cross-platform native development, and influencing web standards — clearly support a Senior-level classification.
Compensation is tiered by US geography: Tier 1 $137K–$183K, Tier 2 $126K–$168K, Tier 3 $116K–$155K. The min/max reported here span the full US range ($116K–$183K).
The degree requirement states 'a degree or equivalent in Computer Science or a related field,' meaning equivalent experience is explicitly accepted — treated as no hard degree gate.
The role is tagged #LI-REMOTE and lists no specific office location, confirming fully remote work within the US.
Skills such as 'creative problem-solving', 'debugging skills', 'ability to learn a large codebase', and 'written/verbal communication' are soft skills or general competencies and are not emitted as named technology skills.
The posting references the Gecko rendering engine and Firefox as the primary codebase context, but 'Gecko' is not a standalone hireable technology skill — it is the product the candidate will work on.
Ignored 1 non-technology phrase(s) as skills (responsibilities/concepts, not named tools): Cross-platform native application development.
This posting reads as a fully-remote role, so it was scored against the national candidate pool rather than a single metro.
Read the full posting
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