[All remote jobs](https://jobicy.com/jobs.md)[![Mozilla logo](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2020/10/mozilla.jpg)](https://jobicy.com/company/mozilla.md)[Mozilla](https://jobicy.com/company/mozilla.md) # Contract Staff Software Engineer-FireFox Layout Review the role, location requirements, compensation details, and application process before deciding whether this opportunity fits your next career move. [Apply for this job](#job-application)[View company](https://jobicy.com/company/mozilla.md)ShareRemote from[Canada](https://jobicy.com/job-region/canada.md)SalaryCAD 131,400–217,700 / yrDepartment[Software Engineering](https://jobicy.com/categories/engineering.md)EmploymentContractExperienceSeniorPublished6 Oct 2026Apply before5 Nov 2026Listing views40Application actions4Application toolkit ## Make your next move. Prepare your resume, explore your fit, and draft a cover letter for this opportunity. AI Summary ## The role, at a glance. Mozilla is hiring a contract Staff Software Engineer to independently maintain Firefox's Layout area, including CSS, page layout, asynchronous panning and zooming, text, and image rendering. The role focuses on resolving bugs and regressions, preserving test health, reviewing code, and handling incoming Layout issues across desktop and Android platforms. The engineer will work at a technical-lead level in a large, mature, multithreaded C++ codebase while collaborating in planning and web-compatibility discussions. Strong C++ expertise, browser or web-platform knowledge, CSS layout depth, and advanced debugging skills are central to success. This is a high-autonomy maintenance and reliability role that enables other engineers to focus on performance and security priorities. ## Role DNA A quick view of the complexity, pace, ownership and collaboration implied by the job description. ### Job Complexity 5/5EasyHard ### Pace & Pressure 4/5RelaxedFast-paced ### Autonomy Level 5/5GuidedFull ownership ### Communication Load 4/5IndependentCollaborative AI insightThis is a staff-level role in a complex, mature browser engine where issues may span rendering subsystems, operating systems, and multithreaded behavior. The engineer is expected to lead technical investigation independently while maintaining code quality and preventing regressions. ## Salary analysis Estimated compensation compared with the broader CA market for similar roles. Estimated job medianMarket rateC$174,550CA market rangeC$160k–C$230k0C$253k AI insightThe disclosed Canadian annual hiring ranges span CAD 131,400 to CAD 217,700 across Canada location tiers, producing an overall midpoint of CAD 174,550. For comparison, the estimated US market range for a contract staff-level browser/layout software engineer is USD 160,000 to USD 230,000 annually; this market comparison is an estimate and may vary by contract structure, location, and specialized browser-engine experience. ## Core skills Skills and capabilities most closely associated with this opportunity. [C++](https://jobicy.com/jobs?search_keywords=C%2B%2B.md)[CSS](https://jobicy.com/jobs?search_keywords=CSS.md)[Browser Engineering](https://jobicy.com/jobs?search_keywords=Browser%20Engineering.md)[Firefox Layout](https://jobicy.com/jobs?search_keywords=Firefox%20Layout.md)[Web Standards](https://jobicy.com/jobs?search_keywords=Web%20Standards.md)[Multithreaded Programming](https://jobicy.com/jobs?search_keywords=Multithreaded%20Programming.md)[Cross-Platform Debugging](https://jobicy.com/jobs?search_keywords=Cross-Platform%20Debugging.md)[Performance Optimization](https://jobicy.com/jobs?search_keywords=Performance%20Optimization.md)[Code Review](https://jobicy.com/jobs?search_keywords=Code%20Review.md)[Regression Testing](https://jobicy.com/jobs?search_keywords=Regression%20Testing.md) Sample interview questionsHow would you investigate a Firefox Layout regression that occurs on one platform but not another?I would first create a minimal reproducible test case and identify the affected platform, graphics configuration, and build revision. I would use automated tests, logging, platform-specific debugging tools, and bisection to isolate the responsible change, then validate the fix across relevant desktop or Android configurations to prevent a platform-specific workaround from introducing a broader regression. Describe your approach to debugging a race condition in a large multithreaded C++ codebase. I begin by identifying shared state, ownership boundaries, and synchronization assumptions. I use sanitizers, tracing, deterministic reproduction techniques where possible, and focused instrumentation to establish ordering and lifetime behavior. I then implement the smallest safe synchronization or ownership correction and add regression coverage that exercises the problematic concurrency path. What CSS and page-layout concepts are most important when working on a browser rendering engine? Important concepts include the cascade, formatting contexts, box-model calculations, intrinsic sizing, flexbox, grid, fragmentation, positioning, overflow, painting order, and writing modes. At the engine level, I would also consider invalidation, layout-tree structure, reflow performance, and conformance with relevant web specifications and compatibility expectations. How do you balance rapid maintenance work with long-term code health? I prioritize user-impacting regressions and correctness issues, but I avoid narrowly patching symptoms when the root cause is clear. For each fix, I add or improve automated coverage, document important technical tradeoffs in review, and identify recurring problem areas that should be scheduled for cleanup or architectural follow-up. How would you use AI development tools responsibly in browser-engine maintenance? I would use them to accelerate exploration, generate hypotheses, summarize unfamiliar code paths, and draft test ideas, while independently validating all outputs against source code, specifications, tests, and reviewer feedback. I would not rely on generated suggestions for correctness in security-sensitive, concurrent, or standards-critical changes without rigorous verification. Opportunity details ## About this role. You will take on the ongoing maintenance and routine engineering work in Firefox’s Layout area (CSS, page layout, APZ, text, images). Working independently at a tech-lead level, you keep the Layout code healthy. ### Responsibilities * Own day-to-day Layout maintenance: fix bugs and regressions, keep tests green, handle incoming issues. * Diagnose and fix Layout problems across platforms (Windows, macOS, Linux, Android). * Carry code review and routine upkeep so the FTE engineers can focus on other mission critical projects. . * Join planning and standards / web-compat meetings as needed. Definition of done A healthy Layout area, backlog and regressions kept down, with the team’s senior engineers freed to focus on critical Performance and Security issues. Required qualifications * Strong C++ (JavaScript and/or Rust a plus). * Solid CSS and page-layout knowledge. * Strong debugging and optimization in a multithreaded codebase. * Able to work independently and lead technically in a large, mature codebase. ### Preferred * Prior experience in web browser architecture and development. * Prior Web standards experience. * Mobile web development, profiling and debugging skills a plus. * Proven experience in utilization of AI tools (Claude, ChatGPT, etc.) in the investigation, development, debugging, and/or testing of code is a plus. Hiring Ranges: Canada Tier 1 Locations $185,045—$217,700 CAD Canada Tier 2 Locations $131,400—$154,600 CAD Show more [Apply now >](https://jobicy.com/jobs/154690-contract-staff-software-engineer-firefox-layout.md) * ![Upload CV](data:image/svg+xml;base64,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) ### Upload your resume now To unlock remote work opportunities and be discovered by global employers. 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