[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) C++,Storage Encryption 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[UK](https://jobicy.com/job-region/uk.md), [Canada](https://jobicy.com/job-region/canada.md), [Germany](https://jobicy.com/job-region/germany.md)SalaryUndisclosedDepartment[Software Engineering](https://jobicy.com/categories/engineering.md)EmploymentContractExperienceSeniorPublished21 Oct 2026Apply before20 Nov 2026Listing views51Application actions1Application 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 seeking a contract Staff Software Engineer to help deliver Storage Encryption Everywhere in the Firefox Gecko browser engine. The work includes schema migration, private-browsing storage implementation, integration testing, Web Platform Tests, and Gecko-specific tests. The engineer will collaborate through public issue tracking and code review, resolve standards questions, and shepherd the feature through Firefox Nightly, Beta, and Release channels. This is a senior systems-focused role requiring strong C++, database expertise, multithreaded debugging, and substantial browser-engine experience. The role is explicitly remote for candidates in Canada, Germany, or the UK. ## 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 insightThe role requires staff-level ownership of a security-sensitive browser-storage feature in a large, multithreaded C++ codebase. Success depends on navigating Gecko architecture, web standards, release channels, performance regressions, and upstream review processes independently. ## Salary analysis Estimated compensation compared with the broader US market for similar roles. Estimated job median (per year)Market rate$160,000US market range (per year)$140k–$210k0$231.00k AI insightThe yearly pay period is inferred from the job context; it was not explicitly stated by the employer. No employer compensation was disclosed. The yearly cadence is inferred from the senior full-time-equivalent software-engineering role and common market practice; estimated annual USD market compensation is $140,000–$210,000, with an estimated midpoint of $160,000. ## Core skills Skills and capabilities most closely associated with this opportunity. [C++](https://jobicy.com/jobs?search_keywords=C%2B%2B.md)[Firefox Gecko](https://jobicy.com/jobs?search_keywords=Firefox%20Gecko.md)[Browser engines](https://jobicy.com/jobs?search_keywords=Browser%20engines.md)[Storage encryption](https://jobicy.com/jobs?search_keywords=Storage%20encryption.md)[Database systems](https://jobicy.com/jobs?search_keywords=Database%20systems.md)[Schema migration](https://jobicy.com/jobs?search_keywords=Schema%20migration.md)[Private Browsing Mode](https://jobicy.com/jobs?search_keywords=Private%20Browsing%20Mode.md)[Web Platform Tests](https://jobicy.com/jobs?search_keywords=Web%20Platform%20Tests.md)[Integration testing](https://jobicy.com/jobs?search_keywords=Integration%20testing.md)[Multithreaded debugging](https://jobicy.com/jobs?search_keywords=Multithreaded%20debugging.md)[Performance optimization](https://jobicy.com/jobs?search_keywords=Performance%20optimization.md)[Code review](https://jobicy.com/jobs?search_keywords=Code%20review.md)[Web standards](https://jobicy.com/jobs?search_keywords=Web%20standards.md)[Release engineering](https://jobicy.com/jobs?search_keywords=Release%20engineering.md) Sample interview questionsHow would you approach implementing encrypted storage while preserving compatibility with existing user data?I would first map the current storage formats, access paths, and migration constraints. I would design an incremental, recoverable migration with versioning, transactional safeguards, rollback behavior where possible, and tests covering upgrades, interruption, corruption, and private-browsing boundaries. Describe your experience debugging a race condition in a multithreaded C++ system. I begin by making the failure reproducible with targeted logging, assertions, and stress testing. I then trace ownership, thread affinity, locking, and lifetime assumptions, use sanitizers or race-detection tooling where available, and fix the underlying synchronization or design issue before adding a regression test. How would you validate a new Firefox storage behavior against web standards? I would identify the relevant specification requirements and translate them into observable browser behavior. I would add or update Web Platform Tests for interoperable requirements, create Gecko-specific tests for internal behavior, and use test results and specification discussion to resolve ambiguities. What is your process for handling a performance regression introduced by a security feature? I would establish a baseline, isolate the regression with profiling and representative workloads, and determine whether the cost comes from I/O, encryption, locking, allocation, or cache behavior. I would evaluate safe alternatives, validate the fix with benchmarks and correctness tests, and monitor behavior through the release pipeline. How do you work effectively in an open-source code-review environment with module owners? I prepare small, well-scoped patches with clear rationale, tests, and documentation of trade-offs. I respond constructively to review feedback, incorporate module-owner guidance, keep public issue discussions current, and escalate specification or architectural questions early when they affect implementation decisions. Opportunity details ## About this role. ### The role You will help the Firefox DOM LWS team to implement tasks for Storage Encryption everywhere, helping to drive the in-progress project through to completion . ### Responsibilities * Contributing to delivering Storage Encryption Everywhere in Gecko, which may include tasks such as migrating data between schemas, implementing data storage in PBM and integration testing. * Write and pass Web Platform Tests, and add Gecko tests as needed. * Work through code review with the relevant Gecko module owners and iterate to landing. * Surface and help resolve any specification questions the implementation raises. * Shepherd the feature through Nightly, Beta, and Release. Fix correctness, performance issues and regressions. ### Definition of done Ship Storage Encryption Everywhere to release channel. Fix triaged and prioritized issues. ### Required qualifications * Strong C++. * Substantial experience in a browser-engine codebase, ideally Firefox/Gecko. * Substantial experience in databases. * Familiarity with web standards and Web Platform Tests. * Strong debugging and optimization in a multithreaded codebase. * Comfort working in the open: public bugs, code review, and upstream landing. ### Preferred * Prior contributions to Gecko or another major browser engine. * Familiarity with the relevant standards body and specification process. Show more [Apply now >](https://jobicy.com/jobs/156176-contract-staff-software-engineer-firefox-cstorage-encryption.md) > Annual salary information is not provided for this position. 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