{"id":2022621,"url":"https://alion.io/job/seqino-senior-fullstack-engineer","title":"Senior Fullstack Engineer","company":{"id":2293733,"name":"SEQINO","domain":"seqino.com","url":"https://alion.io/company/seqino","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Welcome to the Jungle","truth_index":null},"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":["Puteaux, France","France"],"countries":["FR"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":49000,"max_usd":82000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":182},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Python","optional":false},{"name":"React.js","optional":false},{"name":"JavaScript","optional":true}],"status":"live","first_seen_at":"2026-09-04T14:11:30Z","employer_posted_date":"2026-10-07","last_verified_at":"2026-11-03T21:26:47Z","board_verified":true,"closed_at":null,"days_open":60,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":60},"description":"Rejoignez notre équipe en tant que Senior Fullstack Engineer. Vous serez responsable de la conception, du développement et de la fiabilisation de fonctionnalités de bout en bout, tout en partageant votre expertise pour élever le niveau technique de l'équipe. Vous travaillerez en étroite collaboration avec le CTO, le lead backend et les équipes produit, dans une ambiance saine et exigeante.\nMissions\nLivrer des fonctionnalités de production de haute qualité, en assurant leur test, leur documentation et leur observabilité.\nTraiter des sujets complexes de la conception à la mise en production, en assurant le suivi post-release.\nAssurer la qualité runtime et l'expérience utilisateur, en mettant en place des systèmes de monitoring, de logs et d'alertes.\nProfil recherché\nUne personne **polyvalente, autonome et proactive**, qui voit le code **comme un levier de transformation produit**.Quelqu’un de **fiable, rapide et clair**, capable de livrer des fonctionnalités complètes tout en **élevant le niveau de l’équipe.**\n* Expérience confirmée en **développement fullstack** : Python pour le backend, React pour le frontend.\n* Maîtrise des **API, services distribués, bases de données et interfaces utilisateur modernes**.\n* Sensibilité forte à la **performance, fiabilité, sécurité, observabilité et UX**.\n* Autonome, rigoureux·se et capable de **prendre des décisions techniques importantes**.\n* Goût pour la collaboration et la **transmission des bonnes pratiques**.\n* Une expérience dans des environnements **financiers** ou **réglementés** est un vrai plus.","description_format":"text","description_chars":1565,"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":[{"language":"French","level":"Advanced (C1)","optional":false}]},"benefits":[],"hiring_locations":[{"name":"France","iso":"FR","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Software","Billing & Subscription Management","Accounting & Bookkeeping Services"],"lifecycle":[{"event":"open","at":"2026-10-07T13:23:18Z"}],"visa":[],"liveness":{"score":21,"band":"cold","label":"Long shot","p_open":1,"p_active":0.611,"p_room":0.35,"age_days":59,"expected_fill_days":29,"reasons":["conf:3","win:tail"],"computed_at":"2026-11-03T05:54:40Z"},"pay":null,"html_url":"https://alion.io/job/seqino-senior-fullstack-engineer","json_url":"https://alion.io/job/seqino-senior-fullstack-engineer.json","meta":{"generated_at":"2026-11-03T21:47:29Z","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":93,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-11-04T00:00:00Z"}},"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":2293733},"rest":"https://alion.io/mcp/rest/get_company?id=2293733"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fseqino-senior-fullstack-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%2Fseqino-senior-fullstack-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%2Fseqino-senior-fullstack-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/seqino-senior-fullstack-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fseqino-senior-fullstack-engineer"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":2022621}},{"tool":"search_jobs","arguments":{"company":"seqino.com","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":2022621},"note":"people open to offers who fit this vacancy"}],"note":"The same data through MCP tools: https://alion.io/mcp/open needs no sign-in (compact searches, postings, people); https://alion.io/mcp with an Alion account has everything. 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