{"id":3802246,"url":"https://alion.io/job/octogone-developpeur-fullstack","title":"Développeur Fullstack","company":{"id":3908469,"name":"Octogone","domain":"octogoneit.fr","url":"https://alion.io/company/octogone-2","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":null,"truth_index":null},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Vélizy-Villacoublay, France"],"countries":["FR"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":null,"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"CI/CD","optional":false},{"name":"Docker","optional":false},{"name":"Grafana","optional":false},{"name":"GraphQL","optional":false},{"name":"Java","optional":false},{"name":"Kubernetes","optional":false},{"name":"LLM","optional":false},{"name":"Micronaut","optional":false},{"name":"Prometheus","optional":false},{"name":"Quarkus","optional":false},{"name":"React.js","optional":false},{"name":"Rest API","optional":false},{"name":"Spring Boot","optional":false},{"name":"TypeScript","optional":false},{"name":"JavaScript","optional":true}],"status":"live","first_seen_at":"2026-11-05T10:13:11Z","employer_posted_date":null,"last_verified_at":"2026-11-05T10:13:11Z","board_verified":false,"closed_at":null,"days_open":3,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":3},"description":"Poste :\nDans le cadre du développement d’une plateforme d’intelligence artificielle générative et agentique, nous recherchons un développeur Fullstack senior Java / React pour concevoir et industrialiser les interfaces et les services associés.\nLa plateforme permettra aux utilisateurs d’interagir en langage naturel avec des agents IA, d’automatiser certaines tâches et de bénéficier d’une aide à la décision. Elle devra également s’intégrer au système d’information de l’entreprise : applications métiers, authentification et sources de données.\nLe projet présente des enjeux importants de sécurité, de fiabilité et de passage à l’échelle, avec une population cible pouvant atteindre 80 000 utilisateurs.\nLe cœur du besoin porte sur le backend Java et son industrialisation dans un environnement on-premise contraint en ressources RAM et CPU. La capacité à intervenir sur le frontend est également attendue, mais reste secondaire par rapport à l’expertise backend.\n\nVos Mission :\nConcevoir et développer les services backend Java, les API REST/GraphQL et les intégrations avec les LLM, les agents IA et les applications du système d’information.\n\nContribuer aux interfaces React/TypeScript : interfaces conversationnelles, tableaux de bord, notifications et gestion des permissions.\n\nAssurer la performance et la fiabilité de la solution : profilage, optimisation RAM/CPU, dimensionnement, tests automatisés et tests de charge.\n\nParticiper à l’industrialisation et à la sécurisation : Docker, CI/CD, supervision, authentification, contrôle des accès et préparation des déploiements on-premise.\n\nProduire la documentation technique et d’exploitation, et contribuer aux audits de sécurité ainsi qu’à la recette avant mise en production.\n\nProfil recherché\nVous disposez d’au moins 5 ans d’expérience en ingénierie logicielle, avec une expérience confirmée de Java en production et du développement d’applications complexes.\nLes compétences prioritaires sont les suivantes :\nMaîtrise de Java et d’un framework backend tel que Spring Boot, Quarkus ou Micronaut.\n\nExpérience des systèmes distribués et des déploiements on-premise.\n\nCompétences solides en profilage, optimisation des performances et maîtrise de la consommation RAM/CPU.\n\nBonne pratique des API REST et/ou GraphQL, de la persistance des données et des tests automatisés.\n\nCapacité à intervenir sur React et TypeScript.\n\nMaîtrise des principes SOLID, du Clean Code et du typage strict.\n\nExpérience de Docker, des chaînes CI/CD et des mécanismes de sécurité applicative.\n\nUne expérience uniquement centrée sur le développement fonctionnel Java / React ne suffira pas : la capacité à industrialiser un backend performant, à le dimensionner et à le faire fonctionner sous contraintes de ressources constitue un critère déterminant.\nLes compétences complémentaires appréciées sont :\nExpérience des LLM, de l’IA générative ou des architectures agentiques.\n\nConnaissance de Kubernetes et des outils Prometheus, Grafana ou ELK.\n\nPratique du Domain Driven Design — DDD.\n\nExpérience des architectures événementielles — Event Driven Architecture.","description_format":"text","description_chars":3096,"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":[],"hiring_excludes":[],"relocation_offered":false,"industries":["IT Consulting & Digital Transformation","Custom Software Development"],"lifecycle":[{"event":"open","at":"2026-11-05T11:56:00Z"}],"visa":[],"liveness":{"score":90,"band":"hot","label":"Hiring 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