{"id":771040,"url":"https://alion.io/job/seo-blog-by-ahrefs-ocaml-developer","title":"OCaml Developer","company":{"id":34332,"name":"Ahrefs","domain":"ahrefs.com","url":"https://alion.io/company/seo-blog-by-ahrefs","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":{"grade":"A","score":88,"open_postings":14,"ghost_share":0,"stale_share":0.5,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-10-20T05:45:00Z"}},"role":"Backend","role_family":"Backend","seniority":null,"employment_type":null,"work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"explicit","locations":["Cambridge, United States","Tokyo, Japan","Singapore","Palo Alto, United States"],"countries":["US","JP","SG"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"C++","optional":false},{"name":"Linux","optional":false},{"name":"OCaml","optional":false}],"status":"live","first_seen_at":"2024-01-22T17:11:35Z","employer_posted_date":"2026-08-06","last_verified_at":"2026-10-20T17:57:24Z","board_verified":true,"closed_at":null,"days_open":1002,"trust":{"level":"stale","repost_count":0,"flags":["stale"],"days_open":1001},"description":"Ahrefs is looking for a backend developer with deep understanding of networks, distributed systems, OS fundamentals and taste for simple and efficient architectural designs. Our backend is mostly implemented in OCaml with some C++.\nThis role is based out of one of our offices - Palo Alto, Cambridge (MA), Singapore or Tokyo. You can be based in whichever of these you have the legal right to work in, but this is an on-site role: we're looking for someone who'll be in the office with the team.\nIn this role, be prepared to deal with 25 petabytes of live data, OCaml and Linux on a daily basis.\n\nAhrefs OCaml\nBasic Requirements:\nProficiency in OCaml\nKnowledge of C++ is a plus but not essential\nThe ideal candidate is expected to:\nIndependently deal with bugs, schedule tasks and investigate code\nMake well-reasoned technical choices and take responsibility for them\nUnderstand the whole technology stack at all levels: from network and user-space code to OS internals and hardware\nHandle full development cycle of a single component i.e. formalize task, write code and tests, setup and support production, resolve user requests\nApproach problems with a practical mindset and suppress perfectionism when time is a priority\nWrite flexible, maintainable code and adapt to post-launch requirements/tweaks\nThese requirements stem naturally from our approach to development with fast feedback cycle, highly-focused personal areas of responsibility and strong tendency to vertical component splitting.\nIf your preference is leaning towards making the web functional and working on user-facing stuff, you may want to consider our ReasonML position instead.\nWhat You Get\nWe offer:\nCompetitive compensation package\nInformal and thriving work atmosphere\nAbove-average perks and fringe benefits\nFirst-class workplace (hardware, software, etc) in the modern office\nLocation: Palo Alto, Cambridge (MA), Singapore or Tokyo - on-site\nAhrefs does not engage with agencies or third party recruitment solutions for the roles we hire for. If at any point we need help, we'll let you know!","description_format":"text","description_chars":2070,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":[],"hiring_locations":[{"name":"Singapore","iso":"SG","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Search Engine Optimization (SEO)","Digital Marketing"],"lifecycle":[{"event":"open","at":"2026-09-11T21:36:34Z"}],"visa":[],"liveness":{"score":4,"band":"cold","label":"Long shot","p_open":1,"p_active":0.135,"p_room":0.28,"age_days":1001,"expected_fill_days":32,"reasons":["conf:0","stale_co","win:tail","crowd:"],"computed_at":"2026-10-20T05:45:00Z"},"pay":null,"html_url":"https://alion.io/job/seo-blog-by-ahrefs-ocaml-developer","json_url":"https://alion.io/job/seo-blog-by-ahrefs-ocaml-developer.json","meta":{"generated_at":"2026-10-20T19:59:28Z","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_verified","counted_by":"address","units_charged":1,"used_today":23114,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-21T00:00:00Z"}},"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":34332},"rest":"https://alion.io/mcp/rest/get_company?id=34332"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fseo-blog-by-ahrefs-ocaml-developer"},{"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%2Fseo-blog-by-ahrefs-ocaml-developer"},{"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%2Fseo-blog-by-ahrefs-ocaml-developer"},{"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/seo-blog-by-ahrefs-ocaml-developer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fseo-blog-by-ahrefs-ocaml-developer"}]}