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Mozilla

Contract Staff Software Engineer – WebCompat & Bug Triage

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Remote from
Canada
Salary
Undisclosed
Department
Software Engineering
Employment
Contract
Experience
Senior
Published
Apply before
26 Nov 2026
Listing views
52
Application actions
2
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AI Summary

The role, at a glance.

Mozilla is seeking a contract Staff Software Engineer to reduce Firefox's WebCompat backlog and improve compatibility with real-world websites. The role focuses on reproducing, diagnosing, and triaging site-breakage reports, then creating compatibility interventions or small code fixes. Strong practical web debugging skills across HTML, CSS, JavaScript, browser developer tools, and cross-browser behavior are central to success. The engineer will use AI-assisted tooling to accelerate investigation and implementation while ensuring fixes are correctly validated and landed. Gecko or web-standards experience is advantageous but can be learned on the job.

Role DNA

A quick view of the complexity, pace, ownership and collaboration implied by the job description.

Job Complexity

4/5
EasyHard

Pace & Pressure

4/5
RelaxedFast-paced

Autonomy Level

4/5
GuidedFull ownership

Communication Load

3/5
IndependentCollaborative
AI insightThis is a senior-level debugging role involving ambiguous, real-world website failures across browser engines and web standards. It requires sound independent judgment to turn incomplete reports into verified diagnoses and safe fixes.

Salary analysis

Estimated compensation compared with the broader US market for similar roles.

Estimated job median (per hour)Market rate
$85
US market range (per hour)$65–$110
AI insightThe hourly pay period is inferred from the job context; it was not explicitly stated by the employer. No employer compensation was disclosed. The hourly cadence and USD market estimate are inferred for a senior contract software-engineering role in Canada; estimated market range is $65–$110 per hour, with a midpoint of $85 per hour.

Core skills

Skills and capabilities most closely associated with this opportunity.

HTMLCSSJavaScriptWeb CompatibilityCross-Browser DebuggingBrowser Developer ToolsBug TriageFirefoxGeckoWeb StandardsSoftware DebuggingAI-Assisted DevelopmentIssue Reproduction
Sample interview questions
How would you investigate a website that works in another browser but breaks in Firefox?

I would first reproduce the issue in a clean Firefox profile and capture exact steps, expected behavior, and observed behavior. I would compare network activity, console errors, DOM output, CSS layout, and relevant API behavior across browsers, then reduce the issue to a minimal test case and determine whether an intervention, site-facing diagnosis, or browser fix is appropriate.

What makes a WebCompat bug diagnosis actionable?

An actionable diagnosis includes reliable reproduction steps, affected Firefox and site versions, expected versus actual results, relevant console or network evidence, and a concise explanation of the likely root cause. It should also identify the appropriate owner or propose a minimal next action, such as a compatibility intervention or a product bug.

How would you use AI tools when debugging a compatibility issue?

I would use AI to speed up hypothesis generation, summarize logs, suggest test cases, and draft small patches or tests. I would independently validate all outputs through browser testing, code review standards, and minimal reproducible examples rather than treating generated suggestions as authoritative.

Describe how you would validate a small compatibility fix before landing it.

I would verify that the original regression is fixed in affected Firefox versions or builds, test representative unaffected scenarios, and compare behavior with other browsers where useful. I would add or update automated coverage when feasible, check for unintended scope from the intervention, and document the evidence in the bug report.

How do you prioritize a long queue of incoming site-breakage reports?

I would prioritize reports by user impact, reproducibility, severity, regression risk, and whether a small intervention can resolve a broadly used site. I would quickly close duplicates or non-actionable reports, group similar failures, and maintain clear status updates so the backlog becomes measurable and easier to process.

This analysis is generated from the job description. Salary estimates, role characteristics and sample answers are guidance, not employer-provided facts.
Opportunity details

About this role.

You will help reduce Firefox’s WebCompat bug backlog by finishing or verifying the diagnosis of the long tail of site-breakage bugs, and by writing interventions or simple fixes (often with AI assistance). You turn a large queue of reported breakages into diagnosed, actionable, or fixed bugs.

Responsibilities

  • Finish diagnosing, or verify the diagnosis of, long-tail WebCompat bugs.
  • Write WebCompat interventions where appropriate.
  • Write simple fixes (AI-assisted) and land them.
  • Reproduce and triage incoming site-breakage reports.

Required qualifications

  • Solid web development (HTML, CSS, JavaScript) and comfort debugging real-world site breakage.
  • Fluent with browser devtools and cross-browser diagnosis.
  • Comfortable using AI tooling to speed up diagnosis and fixes.

Preferred

  • Gecko knowledge is a strong plus (but can be taught).
  • Prior WebCompat or web-standards experience.

Apply now >

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