{"id":3778211,"url":"https://alion.io/job/naxotech-expert-java-ciam-spring-security-migration-internationale","title":"Expert Java CIAM Spring Security Migration Internationale","company":{"id":3908598,"name":"Naxotech","domain":"naxotech.com","url":"https://alion.io/company/naxotech","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":"freelance","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Lille, France"],"countries":["FR"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":480,"max":570,"currency":"EUR","period":"day","gross":null,"usd_annual":160000},"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"A/B Testing","optional":false},{"name":"Apache Kafka","optional":false},{"name":"Datadog","optional":false},{"name":"Gatling","optional":false},{"name":"Helm","optional":false},{"name":"Java","optional":false},{"name":"Keycloak","optional":false},{"name":"Kubernetes","optional":false},{"name":"OWASP","optional":false},{"name":"Playwright","optional":false},{"name":"Spring Security","optional":false}],"status":"live","first_seen_at":"2026-11-04T20:56:05Z","employer_posted_date":null,"last_verified_at":"2026-11-04T20:56:05Z","board_verified":false,"closed_at":null,"days_open":1,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":1},"description":"Expert(e) Java (CIAM) - (f/m/d). Basé à Lille (hybride), mission longue. L’équipe en charge de l’authentification recherche un(e) expert(e) Java spécialisé(e) CIAM pour assurer le développement et le delivery des briques cœur du système d’authentification. Objectifs : migration d’architecture de Spring Security 5 vers Spring Security 7, conception et maintenance des moteurs d’authentification, gestion des jetons et intégrations protocolaires. Le rôle est hands-on et inclut l’implémentation de patterns résilients basés sur Kafka (Patterns CDC & Outbox), la mise en place de tests automatisés (Playwright, Gatling/Blazemeter) dès la phase de développement, et l’intégration d’un tracking précis via Amplitude. Le/la candidat(e) devra travailler sur la mise en œuvre d’A/B testing via Statsig, traduire les besoins produit en implémentations mesurables, et assurer la trajectoire de remboursement de la dette technique tout en maintenant une cadence de delivery soutenue. La conception des flux complexes devra s’appuyer sur le C4 Model et les services seront déployés et exploités sur Kubernetes avec Helm, avec une observabilité assurée via Datadog.\nProfil recherché\nCompétences \"Must Have\" (non négociables) : +10 ans en Java dans des environnements distribués à fort trafic ; expertise Spring & Spring Security (maîtrise des mécanismes internes : Filters, Authentication Providers, etc.) ; maîtrise de l’Event-Driven Architecture avec Kafka, CDC et pattern Outbox ; expérience avec des outils de tracking (Amplitude) et de Feature Flagging / A/B testing (Statsig) ; maîtrise de Kubernetes, Helm et Datadog ; tests : Playwright (E2E) et Gatling/Blazemeter (load testing) ; langue : anglais technique (documentation impérative). Atouts : notions de sécurité (OAuth 2.1 / OIDC), expérience sur Keycloak ou équivalent, sécurisation du code (OWASP), notions de développement frontend pour intégration des SDK de tracking et des flux CIAM. 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