{"id":2908197,"url":"https://alion.io/job/thefrenchsourcer-senior-backend-engineer","title":"Senior Backend Engineer","company":{"id":4451662,"name":"The French Sourcer","domain":"thefrenchsourcer.com","url":"https://alion.io/company/thefrenchsourcer","size_band":"201-500","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Manatal","truth_index":null},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":null,"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":50000,"max_usd":85000,"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":"C#","optional":false},{"name":"CI/CD","optional":false},{"name":"Java","optional":false},{"name":"Kotlin","optional":false},{"name":"Node JS","optional":false},{"name":"JavaScript","optional":true}],"status":"live","first_seen_at":"2026-10-20T08:38:43Z","employer_posted_date":"2026-10-20","last_verified_at":"2026-10-25T16:25:16Z","board_verified":true,"closed_at":null,"days_open":5,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":5},"description":"Build the services behind a product used every day, while helping the platform scale beyond its original architecture.\nSenior Backend Engineer - Paris\nParis, France · Permanent · Hybrid\nWhat you'd actually work on\nDesigning and developing backend services for a high-traffic SaaS platform\nBuilding APIs used by customer-facing products and internal systems\nBreaking down parts of an existing monolith into clearly defined services\nImproving application performance, reliability, and scalability\nDesigning relational data models and optimising critical queries\nWriting automated unit, integration, and API tests\nReviewing code and contributing to shared engineering standards\nInvestigating production issues across applications, databases, and infrastructure\nWorking with product managers and frontend engineers to define technical solutions\nImproving deployment and release processes with the platform team\nContributing to architecture decisions and technical documentation\nWhere it gets technically interesting\nEvolving a mature platform without interrupting ongoing product delivery\nDeciding which components should become independent services and which should remain together\nManaging data consistency and dependencies across distributed services\nImproving performance on endpoints operating under sustained production load\nIntroducing stronger testing and observability into critical legacy components\nBalancing immediate product needs with longer-term architectural improvements\nWhat we're looking for\n5+ years of experience developing backend applications\nStrong experience with Java, Kotlin, C#, Node.js, or a comparable backend technology\nExperience designing and maintaining production APIs\nGood knowledge of relational databases and data modelling\nUnderstanding of distributed systems and asynchronous communication\nExperience with automated testing, code reviews, and CI/CD\nPractical knowledge of containers and cloud environments\nAbility to investigate production issues across several technical layers\nConfidence working with product, frontend, and platform teams\nProfessional French and English\nThe company\nA European SaaS company serving several thousand business customers. The platform is expanding across new products and markets, creating a need to modernise parts of the architecture while continuing to deliver new functionality.\nHealth insurance, meal vouchers, profit-sharing, and a hybrid working policy.\nLanguages: Native or bilingual French and professional English.\nA search run by The French Sourcer, recruitment built for technical teams.","description_format":"text","description_chars":2567,"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":[{"language":"French","level":"Proficiency (C2)","optional":false},{"language":"English","level":"All levels","optional":false}]},"benefits":["Health insurance","Hybrid work"],"hiring_locations":[{"name":"France","iso":"FR","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":[],"lifecycle":[{"event":"open","at":"2026-10-20T08:38:43Z"}],"visa":[],"liveness":{"score":90,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.903,"p_room":1,"age_days":4,"expected_fill_days":35,"reasons":["conf:0","velocity","win:early"],"computed_at":"2026-10-25T05:49:26Z"},"pay":null,"html_url":"https://alion.io/job/thefrenchsourcer-senior-backend-engineer","json_url":"https://alion.io/job/thefrenchsourcer-senior-backend-engineer.json","meta":{"generated_at":"2026-10-25T17:39:09Z","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":25141,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-26T00:00:00Z"}},"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":4451662},"rest":"https://alion.io/mcp/rest/get_company?id=4451662"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fthefrenchsourcer-senior-backend-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%2Fthefrenchsourcer-senior-backend-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%2Fthefrenchsourcer-senior-backend-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/thefrenchsourcer-senior-backend-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fthefrenchsourcer-senior-backend-engineer"}]}