{"id":144544,"url":"https://alion.io/job/equativ-back-end-engineer-freelance","title":"Backend Engineer [Freelance]","company":{"id":52952,"name":"Equativ","domain":"equativ.com","url":"https://alion.io/company/equativ","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Lever","truth_index":{"grade":"B","score":75,"open_postings":6,"ghost_share":0,"stale_share":1,"repost_share":0,"time_to_fill_p50_days":38,"computed_at":"2026-10-17T05:46:00Z"}},"role":"Backend","role_family":"Backend","seniority":"middle","employment_type":"freelance","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":43000,"max_usd":65000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":80},"experience_years_min":3,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Aerospike","optional":false},{"name":"Apache Kafka","optional":false},{"name":"C#","optional":false},{"name":"Docker","optional":false},{"name":"GCP","optional":false},{"name":"Kubernetes","optional":false},{"name":"PHP","optional":false},{"name":"Agile","optional":true},{"name":"CI/CD","optional":true}],"status":"live","first_seen_at":"2026-04-30T16:26:52Z","employer_posted_date":"2026-04-30","last_verified_at":"2026-10-17T20:23:22Z","board_verified":true,"closed_at":null,"days_open":170,"trust":{"level":"stale","repost_count":0,"flags":["stale"],"days_open":169},"description":"About the team\nAt Equativ, we’re on a mission to develop advertising technologies that empower our customers to reach their digital business goals. This means that we rely on massively scalable, widely distributed, highly available, and efficient software systems; the platform deals with over 3 million requests per second (+250 billion/day) managed by 3,000 servers with less than 250ms response time.\nOur innovation team based in Paris, Nantes, Bordeaux, Limoges, Krakow and Berlin is composed of 150+ straightforward and energetic engineers working in an Agile environment and ready to tackle the most complex technical challenges.\nYour mission\nYou will join our Addressability team distributed in multiple locations. You will be onboarded in a multi expertise feature team of back-end developers and Data Engineers, with the mission to build and query a multi billion entry Id Graph, plug third party data providers and provide customers and business teams with advanced targeting and reporting features.\nWhat you'll do\nIngestion of massive amounts of data high performance key value stores\n\nQuery user data millions of times per second with a response time of a few ms\n\nImprovement of our graph by making it sharper, faster\n\nDesign trade offs (feature vs performance)\n\nBusiness support on external partners' and customers\n\nAbout you\n3-4 years of seniority in high perf, low latency C# coding\n\nExpertise of Aerospike or equivalent high performance KV store\n\nExperience with Event streaming (Kafka), Go, PHP, Docker, Kubernetes, Cloud platforms (ideally GCP) is a big plus\n\nAble to lead design discussions and mentor others\n\nCustomer oriented approach: you deliver clean and usable solutions for customers (and you know that customers hate bugs!)\n\nProficient in verbal and written English\n\nPassion for writing high quality and maintainable code following Software Craftsmanship or Continuous Delivery\n\nEntrepreneurial spirit and know-how to identify opportunities of improvement\n\nPersonal projects with code sharing, we’re curious about your art!","description_format":"text","description_chars":2050,"description_truncated":false,"requirements":{"experience_years_min":3,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[{"language":"English","level":"All levels","optional":false}]},"benefits":[],"hiring_locations":[{"name":"France","iso":"FR","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Advertising"],"lifecycle":[{"event":"open","at":"2026-04-30T16:26:52Z"}],"visa":[],"liveness":{"score":9,"band":"cold","label":"Long shot","p_open":1,"p_active":0.311,"p_room":0.28,"age_days":169,"expected_fill_days":38,"reasons":["conf:1","win:tail","crowd:"],"computed_at":"2026-10-17T05:46:00Z"},"pay":null,"html_url":"https://alion.io/job/equativ-back-end-engineer-freelance","json_url":"https://alion.io/job/equativ-back-end-engineer-freelance.json","meta":{"generated_at":"2026-10-17T21:46:14Z","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":6521,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-18T00:00:00Z"}},"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":52952},"rest":"https://alion.io/mcp/rest/get_company?id=52952"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fequativ-back-end-engineer-freelance"},{"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%2Fequativ-back-end-engineer-freelance"},{"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%2Fequativ-back-end-engineer-freelance"},{"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/equativ-back-end-engineer-freelance\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fequativ-back-end-engineer-freelance"}]}