{"id":2908198,"url":"https://alion.io/job/thefrenchsourcer-senior-backend-developer","title":"Senior Backend Developer","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":"on_site","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":"CI/CD","optional":false},{"name":"JavaScript","optional":false},{"name":"Node JS","optional":false}],"status":"live","first_seen_at":"2026-10-20T08:38:43Z","employer_posted_date":"2026-10-20","last_verified_at":"2026-10-23T12:27:27Z","board_verified":true,"closed_at":null,"days_open":3,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":3},"description":"Build the backend services behind a real-time gaming platform processing tens of thousands of messages every second.\nSenior Backend Developer - Real-Time Platform\nParis, France · Permanent · On-site\nWhat you'd actually work on\nDesigning highly available backend architecture for a real-time transactional platform\nBuilding and maintaining scalable microservices using server-side JavaScript\nDeveloping APIs and data models used by the platform's core services\nContributing to a communication gateway handling authentication, flow control, routing, and asynchronous messaging\nDeveloping user registration services capable of absorbing significant traffic peaks\nAdding new functionality and mechanics to the platform's core engine\nImproving application performance, scalability, and resource usage\nDesigning automated unit, functional, integration, and load tests\nReviewing code and contributing to shared engineering standards\nDeploying services on managed cloud infrastructure\nImplementing monitoring and investigating production performance\nMaintaining technical and architectural documentation\nWorking with frontend, data, infrastructure, security, and project teams\nWhere it gets technically interesting\nA communication gateway processing tens of thousands of messages per second\nEvent-driven services where ordering, retries, duplicate messages, and partial failures must be managed explicitly\nServer-side JavaScript used for concurrent, high-throughput systems beyond standard web applications\nServices that must absorb sudden traffic peaks without affecting availability\nAsynchronous messaging and in-memory data structures supporting real-time application flows\nRelational databases operating under concurrent transactional workloads\nQuery optimisation, transaction boundaries, and lock management under contention\nCaching and load-distribution decisions that directly affect performance and consistency\nA modular platform requiring continuous availability and strict protection of user data\nWhat we're looking for\n5+ years of experience building and operating backend services in production\nStrong experience with server-side JavaScript and Node.js\nExperience developing services that handle high request or message volumes\nGood understanding of high availability, load distribution, scalability, and caching\nExperience designing microservices and event-driven architectures\nStrong knowledge of asynchronous messaging systems and in-memory data structures\nExperience with relational data modelling and complex query optimisation\nUnderstanding of transactions, concurrency, locking, and data consistency\nPractical experience with automated unit, functional, integration, and load testing\nKnowledge of containers, continuous deployment pipelines, and monitoring tools\nAbility to investigate performance and production issues across multiple technical layers\nA Master's degree or equivalent technical background\nThe company\nA European digital entertainment company operating high-volume online platforms across several markets.\nThe organisation employs approximately 500 people and serves hundreds of thousands of active users. Its proprietary transactional platform supports real-time activity, personalised user experiences, and fraud prevention while maintaining strict availability and data protection requirements.\nHealth insurance, profit-sharing, and an employee incentive scheme.\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":3531,"description_truncated":false,"requirements":{"experience_years_min":5,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"master","optional":true},"security_clearance":false,"languages":[{"language":"French","level":"Proficiency (C2)","optional":false},{"language":"English","level":"All levels","optional":false}]},"benefits":["Health insurance"],"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":2,"expected_fill_days":35,"reasons":["conf:2","velocity","win:early"],"computed_at":"2026-10-23T05:54:15Z"},"pay":null,"html_url":"https://alion.io/job/thefrenchsourcer-senior-backend-developer","json_url":"https://alion.io/job/thefrenchsourcer-senior-backend-developer.json","meta":{"generated_at":"2026-10-23T12:35:13Z","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":18912,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-24T00:00:00Z"}},"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-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%2Fthefrenchsourcer-senior-backend-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%2Fthefrenchsourcer-senior-backend-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/thefrenchsourcer-senior-backend-developer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fthefrenchsourcer-senior-backend-developer"}]}