{"id":3824417,"url":"https://alion.io/job/visian-software-engineer-fullstack-net-reactjs-fh","title":"Software Engineer Fullstack .NET / ReactJS (F/H)","company":{"id":3908419,"name":"Visian","domain":"visian.tech","url":"https://alion.io/company/visian","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"services","is_intermediary":false,"listed_via":null,"ats_vendor":"Welcome to the Jungle","truth_index":{"grade":"A","score":92,"open_postings":3,"ghost_share":0,"stale_share":0.333,"repost_share":0,"time_to_fill_p50_days":43,"computed_at":"2026-11-06T05:58:05Z"}},"role":"Backend","role_family":"Backend","seniority":null,"employment_type":"freelance","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Paris, 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à destination des utilisateurs internes et des clients finaux.\nVous intégrerez une équipe Agile composée d'un Tech Lead, de développeurs, de testeurs, d'un Product Owner et de Business Analysts, organisée autour d'une Feature Team et fonctionnant en méthodologie Scrumban.\nVotre périmètre d'intervention couvrira une vingtaine d'applications et de services reposant sur un environnement technique varié, allant de technologies historiques à des architectures modernes.\nÀ ce titre, vos principales missions seront :\nAssurer la maintenance évolutive et corrective des applications existantes.\n\nConcevoir, développer et faire évoluer des fonctionnalités Frontend et Backend.\n\nParticiper à la modernisation progressive des applications Legacy.\n\nContribuer au redesign et à l'amélioration des interfaces utilisateurs en ReactJS.\n\nDévelopper et maintenir des API et services basés sur .NET Core.\n\nParticiper à la conception et à la construction de nouvelles solutions applicatives.\n\nPrendre part à la définition et à la conception d'une nouvelle plateforme métier prévue à partir de 2027.\n\nContribuer à l'intégration de nouvelles technologies, notamment autour de l'intelligence artificielle et des agents IA, afin d'optimiser les parcours utilisateurs.\n\nVous évoluerez dans un environnement technique stimulant, appliquant les principes du Software Craftsmanship : TDD, BDD, Clean Code, Code Reviews, automatisation des tests et amélioration continue de la qualité logicielle.\nProfil recherché\nDe formation supérieure en informatique, vous justifiez d'une expérience en développement Fullstack.\n\nVous maîtrisez les technologies Frontend, notamment ReactJS.\n\nVous disposez de solides compétences Backend en C# et .NET Core.\n\nVous maîtrisez les bases de données SQL Server.\n\nUne connaissance d' WebForms constitue un plus pour intervenir sur des applications historiques.\n\nVous êtes sensible aux bonnes pratiques de développement : TDD, BDD, Clean Code, Code Reviews et 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