{"id":1754548,"url":"https://alion.io/job/duckduckgo-senior-web-compatibility-engineer","title":"Senior Web Compatibility Engineer","company":{"id":3478,"name":"DuckDuckGo","domain":"duckduckgo.com","url":"https://alion.io/company/duckduckgo","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":{"grade":"A","score":93,"open_postings":8,"ghost_share":0,"stale_share":0,"repost_share":0.125,"time_to_fill_p50_days":100,"computed_at":"2026-10-06T05:45:30Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"posting_text","remote_working_hours":null,"hiring_geo_confidence":"explicit","locations":["Singapore"],"countries":["SG"],"hiring_countries":["US","GB","CA"],"hiring_countries_total":3,"salary":{"min":178500,"max":178500,"currency":"USD","period":"year","gross":null,"usd_annual":178500},"salary_estimate":null,"experience_years_min":7,"visa_sponsorship":false,"relocation_package":false,"has_equity":true,"technologies":[{"name":"JavaScript","optional":false},{"name":"LLM","optional":false},{"name":"Web Components","optional":false},{"name":"Windows","optional":false},{"name":"AI Agents","optional":true},{"name":"C#","optional":true},{"name":"C++","optional":true},{"name":"Kotlin","optional":true},{"name":"Python","optional":true},{"name":"Swift","optional":true}],"status":"live","first_seen_at":"2026-10-02T18:50:27Z","employer_posted_date":"2026-10-02","last_verified_at":"2026-10-07T00:36:10Z","board_verified":true,"closed_at":null,"days_open":4,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":4},"description":"Who We Are\nHi, we're DuckDuckGo, the online protection company and remote-first team of 300+ on a mission to raise the standard of trust online. Founded in 2008 and profitable since 2014, annual revenue now exceeds $100m USD and millions use our browser on Mac, Windows, iOS, and Android, our search engine, and the latest - Privacy Pro. Our culture of trust, inclusivity, and empowered project management underpins everything we do, where each team member takes full ownership of their projects, from scoping and execution to postmortem. If you're seeking end-to-end ownership of your work - you've come to the right place!\nYour Team and Role\nWorking on the Web Dependability Engineering team, you'll make sure websites just work in DuckDuckGo's browsers across Mac, Windows, iOS, and Android, helping ensure our users have the best-possible experience browsing with DuckDuckGo. Recent projects include:\nReverse-engineering how sites detect our privacy protections and building countermeasures that keep pages working\n\nShimming browser APIs so sites work seamlessly across different browser engines and system webviews\n\nBuilding LLM agent pipelines that automatically reproduce and triage reported site breakage\n\nAs a Senior Web Compatibility Engineer, you'll be our resident expert on why websites break and how to fix them: owning the webcompat side of our triage process, debugging gnarly issues in code you don't control, distinguishing site bugs from browser bugs from privacy protection-induced breakage, leading the charge when a top site breaks and becomes an incident, shipping durable fixes across every platform, and work on related projects that prevent user churn and keep users coming back to DuckDuckGo.\nAbout You\n7+ years of experience building and debugging complex web applications with vanilla JavaScript.\n\nDetailed knowledge of web standards, web components, and browser APIs. Any additional experience with our stack is a bonus: Swift/Kotlin/C#/C++/Python.\n\nAdvanced ability to reverse-engineer obfuscated third-party code and reduce issues to minimal test cases.\n\nPassion for hunting elusive bugs and tracing them to their root cause.\n\nInterest in automating repetitive work and building agentic tooling that multiplies the team's impact.\n\nExperience triaging issues, leading incident response, and communicating clearly with technical and non-technical stakeholders.\n\nExperience shipping code beyond the web, like native or desktop clients.\n\nAbility to lead complex, ambiguous projects with little to no oversight.\n\nCompensation\n$178,500 USD annually and stock options. Compensation is identical within professional levels, regardless of geographic location or team. Compensation for each professional level is transparent across the organization.\nEligibility for company-sponsored health benefits is limited to team members based in the United States. This program does not extend to team members located in other countries, such as Canada or the UK.\nOurTeam Member Support Guide explains how we prioritize your wellbeing including paid parental leave, office setup, and co-working allowances.\nHiring Process\nHiring works best when it's a two-way street. Learn how we help you get to know DuckDuckGo, envision your future role here, and find out more about how we hire.\nDiversity, Equity and Inclusion\nDuckDuckGo provides equal work opportunities to all team members and applicants, and it prohibits discrimination and harassment of any type on the basis of race, color, ethnicity, caste, religion, age, sex (including pregnancy), national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by our policies or federal, state, or local laws.\nWe want to ensure that our hiring process is accessible. If you need reasonable accommodation for any part of the application process because of a medical condition or disability, please send an email to  to let us know the nature of your request.\nPlease note that:\nYou’ll be required to attend meetings on camera via video conferencing\n\nExpect to travel at least two times a year: once for our all-hands meetup and again for a team retreat (each around 4-5 days). While extenuating circumstances may impact attendance, everyone is strongly encouraged to attend.\n\nWhile we offer a flexible work arrangement with no core hours, expect an average full-time commitment of 40 hours per week.\n\nA successful candidate must pass a background check as a condition of joining the team.\n\nBy applying for this role, you confirm that all information submitted is accurate and complete. You further acknowledge that providing false or fraudulent information during the application process is cause for denial of an offer, revocation of any existing offer, or other adverse action, up to and including termination after the start of your commencement of work.\n\nDisclosure Statement: Use of AI in Hiring Process\nAs part of our commitment to enhancing our recruitment process, we utilize artificial intelligence (AI) technology to assist in reviewing and summarizing job applications and test projects, including those tools integrated into our recruitment vendor platforms. We use AI to flag potentially fraudulent applications, analyze and summarize applicants’ experience, interviews, and project performance, and help streamline our selection process.\nKey Principles:\nData Privacy: All information provided in your application will be handled in accordance with our Recruiting Privacy Policy. We ensure that your personal information is protected and used solely for recruitment purposes.\n\nHuman Oversight and Accountability: The AI technology is designed to support our hiring team by providing insights and summaries of applications and evaluations of test projects against scoring rubrics. All final evaluations and hiring decisions, however, will be made by our hiring team, who will consider the AI's input alongside other factors.\n\nTransparency: We believe in transparency regarding our hiring practices. If you have any questions about how AI is used in our recruitment process, please feel free to reach out to us.\n\nBy submitting your application, you acknowledge and consent to the use of AI technology in our review process. If you would like to request an alternative selection process, please contact us as at . Thank you for your interest in joining DuckDuckGo!","description_format":"text","description_chars":6473,"description_truncated":false,"requirements":{"experience_years_min":7,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Equity","Flexible schedule","Parental leave","Stock options"],"hiring_locations":[{"name":"United States","iso":"US","kind":"country"},{"name":"United Kingdom","iso":"GB","kind":"country"},{"name":"Canada","iso":"CA","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Internet Services","Search Engines"],"lifecycle":[{"event":"open","at":"2026-10-03T10:14:42Z"}],"visa":[],"liveness":{"score":86,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.86,"p_room":1,"age_days":3,"expected_fill_days":100,"reasons":["conf:0","win:early"],"computed_at":"2026-10-06T05:45:30Z"},"pay":{"stated_usd_annual":178500,"is_top_pay":false},"html_url":"https://alion.io/job/duckduckgo-senior-web-compatibility-engineer","json_url":"https://alion.io/job/duckduckgo-senior-web-compatibility-engineer.json","meta":{"generated_at":"2026-10-07T02:11:28Z","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","counted_by":"address","units_charged":1,"used_today":3599,"day_limit":5000,"remaining_today":1401,"minute_limit":60,"resets_at":"2026-10-08T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"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":3478},"rest":"https://alion.io/mcp/rest/get_company?id=3478"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fduckduckgo-senior-web-compatibility-engineer"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"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%2Fduckduckgo-senior-web-compatibility-engineer"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"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%2Fduckduckgo-senior-web-compatibility-engineer"},{"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/duckduckgo-senior-web-compatibility-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fduckduckgo-senior-web-compatibility-engineer"}]}