{"id":3954897,"url":"https://alion.io/job/mozilla-corporation-senior-software-engineer-os-integration","title":"Senior Software Engineer, OS Integration","company":{"id":1740,"name":"Mozilla Corporation","domain":"mozilla.org","url":"https://alion.io/company/mozilla","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":{"grade":"A","score":89,"open_postings":25,"ghost_share":0.04,"stale_share":0.32,"repost_share":0.04,"time_to_fill_p50_days":43,"computed_at":"2026-11-09T06:03:00Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":null,"work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"posting_text","remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Canada"],"countries":["CA"],"hiring_countries":["CA"],"hiring_countries_total":1,"salary":null,"salary_estimate":null,"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"C++","optional":false},{"name":"DLP","optional":false},{"name":"JavaScript","optional":false},{"name":"Linux","optional":false},{"name":"Windows","optional":false}],"status":"live","first_seen_at":"2026-11-09T06:58:43Z","employer_posted_date":"2026-11-09","last_verified_at":"2026-11-09T07:06:36Z","board_verified":true,"closed_at":null,"days_open":0,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":0},"description":"Why Mozilla?\nMozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission - to make the internet better for people. \nThe Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders - only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms.\nAbout the OS Integration team:\nThe OS Integration team ensures Firefox works well with the host operating system and environment. We’re a distributed team with expertise in Windows, macOS, and Linux-based operating systems. Our responsibilities include developing fixes and improvements for Firefox related to Windows, macOS, and Linux environments. This might include integration with a new OS feature or fixing an OS-specific user interface bug. Other responsibilities include native crash reporting, OS abstraction layers, sandboxing, hardening, updater, and enterprise DLP support. \nAbout the role:\nAs a member of the OS Integration team, you’ll develop fixes, improvements, and new features for Firefox. In many cases work may be cross-platform or have a cross-platform component. This role will include maintenance and development of the installer and updater of Firefox. You’ll contribute to the team through code review and discussion.\nWhat you’ll do: \nImprove the quality of Firefox and other Mozilla products by debugging and fixing software defects, improving the browsing experience for hundreds of millions of users.\nContribute to new features and improvements.\nBreak down tasks and work with others to deliver solutions.\nCollaborate with experienced software engineers.\nPerform code reviews and provide technical direction.\nWork with a geographically-distributed development team.\nInteract with teams throughout the organization.\nWhat you’ll bring: \n5+ years of overall software engineering experience\nStrong knowledge of C and C++\nExperience with desktop application development on Windows, macOS, or Linux with C++.\nKnowledge of web technologies such as Javascript and HTML.\nKnowledge of secure coding practices and memory safety concerns.\nStrong problem-solving and debugging skills.\nWritten and verbal communication skills with a collaborative mindset.\nWillingness to work effectively in a distributed team environment.\nCommitment to our values:\nPlay to win\nBuild for People first\nEngage Evidence over Ego\nDecide and Deliver\nShip, learn and repeat\nBonus Points for experience with:\nInstaller and/or Updater development on any OS\nWindows internals like the BITS server or MSIX packages\nOpen-source contributions or personal engineering projects\nWhat you’ll get:\nGenerous performance-based bonus plans to all eligible employees - we share in our success as one team\nRich medical, dental, and vision coverage\nGenerous retirement contributions with 100% immediate vesting (regardless of whether you contribute)\nQuarterly all-company wellness days where everyone takes a pause together\nCountry specific holidays plus a day off for your birthday\nOne-time home office stipend\nAnnual professional development budget\nConsiderable paid parental leave\nEmployee referral bonus program\nOther benefits (life/AD&D, disability, EAP, etc. - varies by country)\nAbout Mozilla \nMozilla exists to build the Internet as a public resource accessible to all because we believe that open and free is better than closed and controlled. When you work at Mozilla, you give yourself a chance to make a difference in the lives of Web users everywhere. And you give us a chance to make a difference in your life every single day. Join us to work on the Web as the platform and help create more opportunity and innovation for everyone online.\nCommitment to diversity, equity, inclusion, and belonging\nMozilla understands that valuing diverse creative practices and forms of knowledge are crucial to and enrich the company’s core mission. We encourage applications from everyone, including members of all equity-seeking communities, such as (but certainly not limited to) women, racialized and Indigenous persons, persons with disabilities, persons of all sexual orientations, gender identities, and expressions.\nWe will ensure that qualified individuals with disabilities are provided reasonable accommodations to participate in the job application or interview process, to perform essential job functions, and to receive other benefits and privileges of employment, as appropriate. Please contact us at  to request accommodation.\nWe are an equal opportunity employer. We do not discriminate on the basis of race (including hairstyle and texture), religion (including religious grooming and dress practices), gender, gender identity, gender expression, color, national origin, pregnancy, ancestry, domestic partner status, disability, sexual orientation, age, genetic predisposition, medical condition, marital status, citizenship status, military or veteran status, or any other basis covered by applicable laws. Mozilla will not tolerate discrimination or harassment based on any of these characteristics or any other unlawful behavior, conduct, or purpose.\nGroup: D\nReq ID: R3288\nHiring Ranges:\nCanada Tier 1 Locations\n$104,000—$139,000 CAD\nCanada Tier 2 Locations\n$95,000—$126,000 CAD","description_format":"text","description_chars":5879,"description_truncated":false,"requirements":{"experience_years_min":5,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Equity","Home office","Parental leave","Professional development"],"hiring_locations":[{"name":"Canada","iso":"CA","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["VPN & Proxy Services","Consumer & Utility Software"],"lifecycle":[{"event":"open","at":"2026-11-09T07:06:36Z"}],"visa":[],"liveness":{"score":86,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.86,"p_room":1,"age_days":0,"expected_fill_days":43,"reasons":["conf:2","win:early"],"computed_at":"2026-11-09T09:13:55Z"},"pay":null,"html_url":"https://alion.io/job/mozilla-corporation-senior-software-engineer-os-integration","json_url":"https://alion.io/job/mozilla-corporation-senior-software-engineer-os-integration.json","meta":{"generated_at":"2026-11-09T09:13:55Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":8546,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-11-10T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.1,"usd":0.01,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":1740},"rest":"https://alion.io/mcp/rest/get_company?id=1740"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fmozilla-corporation-senior-software-engineer-os-integration"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":2,"usd":0.2},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Fmozilla-corporation-senior-software-engineer-os-integration"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.1,"usd":0.01},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Fmozilla-corporation-senior-software-engineer-os-integration"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/mozilla-corporation-senior-software-engineer-os-integration\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fmozilla-corporation-senior-software-engineer-os-integration"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":3954897}},{"tool":"search_jobs","arguments":{"company":"mozilla.org","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":3954897},"note":"people open to offers who fit this vacancy"}],"note":"The same data through MCP tools: https://alion.io/mcp/open needs no sign-in (compact searches, postings, people); https://alion.io/mcp with an Alion account has everything. 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