{"id":1710058,"url":"https://alion.io/job/h-company-senior-software-engineer-paris","title":"Senior Software Engineer - Paris","company":{"id":16683,"name":"H Company","domain":"hcompany.ai","url":"https://alion.io/company/hcompany","size_band":"201-500","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":{"grade":"A","score":87,"open_postings":17,"ghost_share":0,"stale_share":0.529,"repost_share":0,"time_to_fill_p50_days":42,"computed_at":"2026-10-20T05:45:00Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Paris, France"],"countries":["FR"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":51000,"max_usd":87000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":173},"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Apache Kafka","optional":false},{"name":"AWS","optional":false},{"name":"Computer Use","optional":false},{"name":"Dask","optional":false},{"name":"Datadog","optional":false},{"name":"Docker","optional":false},{"name":"FastAPI","optional":false},{"name":"Grafana","optional":false},{"name":"GraphQL","optional":false},{"name":"Kubernetes","optional":false},{"name":"LLM","optional":false},{"name":"Machine Learning","optional":false},{"name":"Playwright","optional":false},{"name":"PostgreSQL","optional":false},{"name":"Python","optional":false},{"name":"RabbitMQ","optional":false},{"name":"Rest API","optional":false},{"name":"Selenium","optional":false}],"status":"live","first_seen_at":"2026-10-02T15:16:55Z","employer_posted_date":"2026-10-02","last_verified_at":"2026-10-20T06:56:01Z","board_verified":true,"closed_at":null,"days_open":17,"trust":{"level":"ok","repost_count":0,"flags":[],"days_open":17},"description":"About H:\nWhen we released Holo4 on 28 September, we published every trajectory behind its public benchmark scores at trajectories.hcompany.ai. For OSWorld that's 369 desktop tasks, each run 3 times, with the steps, tokens and time of every attempt. This role builds and runs the evaluation framework that produces runs like these.\nH builds computer-use agents and the models behind them. Developers use them through a managed API, and our forward deployed engineers take them into enterprise workflows.\nWhat this team owns\nThe evaluation framework: orchestration, runtimes and observability. Researchers and forward deployed engineers bring the benchmarks, across web apps, desktop applications and the command line. Your job is to make the framework that runs them reliable, fast and cheap, and to make adding a new one quick. Research uses the results to choose checkpoints and decide whether a model ships. Product and the forward deployed engineers use them to measure agents on customer workflows. It carries roughly 50 benchmarks now. That number should be between 100 and 200 soon, and the framework has to keep up.\nWhat you'd be doing\nIntegration support for researchers and forward deployed engineers bringing in a benchmark, with a shorter path each time.\n\nSetting the standard for how a benchmark enters the framework, and building the checks that enforce it.\n\nScheduling and observability, so cluster capacity isn't left idle while evaluation jobs queue.\n\nReproducible results across trials, so a release decision rests on numbers that hold.\n\nWhatever stack a benchmark calls for. One week that's cluster tuning; the next it's a browser extension or desktop environments.\n\nTime with customers, from single developers to large companies, to find out what they want measured, then automating it so the results flow back into our harnesses and models.\n\nThe first few months\nBy 3 months you'll have helped researchers or forward deployed engineers integrate 5 benchmarks, and started fixing what slows the framework down. By 6 months one part of it is yours, for example scaling the runs, observability, or a group of related benchmarks, and a release will have gone out on your numbers. By 12 months you'll know the design and trade-offs of the whole evaluation system, and be the person the rest of H asks about evaluations.\nWho you'd work with\nCeiran Chapman, our VP Engineering, is hiring for this role. You'd join the evaluation team. The people relying on your work day to day are H's researchers and forward deployed engineers.\nWhat we think it takes\nLikely a good fit if you\nHave spent 5+ years in backend development, with production Python at the core, and use coding agents to go faster without letting quality drop.\n\nHave built test, QA or evaluation tooling that other teams depended on, and care whether a number is right.\n\nHave operated distributed systems on Kubernetes in a public cloud. AWS experience helps most.\n\nHave built and shipped systems end to end, including APIs (REST or GraphQL) and integrations with outside services.\n\nKnow relational and non-relational databases, and message queues such as SQS, RabbitMQ or Kafka.\n\nInstrument what you build, with metrics, tracing and monitoring from the start.\n\nStronger still if you have\nMeasured LLM quality before, or built agents yourself.\n\nPackaged and run workloads in Docker and on virtual machines.\n\nUsed Temporal, Dask, FastAPI, PostgreSQL, Grafana or Datadog.\n\nAutomated web or desktop software with Playwright, Selenium or a browser extension you wrote.\n\nSet standards other engineers follow, through code review, design review or mentoring.\n\nYou do not need a background in machine learning. We'll work that out with you. If you match most of this but not all of it, apply anyway.\nHow we hire\nA 30 minute call with our Talent team, a 60 minute technical challenge, a 60 minute system design interview, and a 30 minute final conversation with Ceiran. About 3.5 hours in total.\nPracticalities\nParis posting: Hybrid in Paris. That means 3 office days a week and a London trip about once every 4 to 6 weeks. There is a London posting for the same role. We offer a competitive package.","description_format":"text","description_chars":4167,"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":[],"hiring_locations":[{"name":"France","iso":"FR","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["AI Agents","Foundation Models","AI Research Labs"],"lifecycle":[{"event":"open","at":"2026-10-02T16:54:48Z"}],"visa":[],"liveness":{"score":55,"band":"ok","label":"Likely open","p_open":1,"p_active":0.614,"p_room":0.9,"age_days":17,"expected_fill_days":42,"reasons":["conf:2","stale_co","velocity","win:mid"],"computed_at":"2026-10-20T05:45:00Z"},"pay":null,"html_url":"https://alion.io/job/h-company-senior-software-engineer-paris","json_url":"https://alion.io/job/h-company-senior-software-engineer-paris.json","meta":{"generated_at":"2026-10-20T09:40:55Z","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":10593,"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":16683},"rest":"https://alion.io/mcp/rest/get_company?id=16683"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fh-company-senior-software-engineer-paris"},{"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%2Fh-company-senior-software-engineer-paris"},{"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%2Fh-company-senior-software-engineer-paris"},{"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/h-company-senior-software-engineer-paris\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fh-company-senior-software-engineer-paris"}]}