.NET developer with JAVA

.
NET Developer – Digital Identity & Security Services
- NL/FR

Location:
Brussels, Belgium Work Model: Hybrid – minimum 2 days on-site per week Work Regime: Full-time Start Date: 2 November 2026 End Date: 31 December 2027 Languages
• Good professional command of Dutch and/or French is required.
• Good professional English is required Role Overview We are looking for an experienced .
NET Developer with Java development experience to join an established technology team supporting critical Digital Identity, Authentication and Authorization services. The consultant will design, develop, test and document secure software components and integrations, working across modern and legacy applications. The role combines strong .
NET/C# and Java development with identity standards, web security, cloud technologies and DevOps practices.

Key Responsibilities
• Develop, test and document software components, libraries and services supporting user authentication and authorization.
• Develop sample applications and code examples demonstrating integration of authentication and authorization services.
• Configure and develop extensions for access managers, authorization engines, API gateways, reverse proxies and directory services.
• Support integration of Digital Identity services with existing, legacy and new applications.
• Develop and improve CI/CD, software-release automation and configuration management.
• Investigate technical requirements, integration challenges and user issues.
• Deploy and configure commercial and open-source products based on technical documentation.
• Participate actively in Agile/Scrum sprints, including planning, execution and evaluation.
• Take ownership of assigned backlog items and technical deliverables.
• Participate in technical meetings and workshops and follow up on agreed actions.
• Design, document, present and validate technical solutions against requirements. Mandatory Technical Skills
• Strong hands-on development experience with C#, .
NET and Java
• REST APIs, JSON and YAML
• JavaScript
• UI development with Vue.js and Blazor
• LDAP and SQL Server
• Identity and authorization standards: OAuth 2.0 and OpenID Connect (OIDC)
• Web security concepts: HTTPS, cookies, CORS, Single Sign-On (SSO) and MFA
• Cryptographic concepts, including symmetric and asymmetric keys
• Kubernetes and Azure Kubernetes Service (AKS)
• Strong working knowledge of Git and DevOps Nice-to-Have Skills
• TypeScript, PowerShell and Bash/Shell scripting
• React
• SAML 2.0
• PKI, hash functions and keystores
• Identity Provider platforms such as ADFS, Keycloak, Ping, Okta or Microsoft Entra ID
• Microservices architecture Soft Skills
• Pragmatic, hands-on and solution-oriented
• Positive and constructive attitude
• Autonomous, resilient and able to work independently
• Versatile, flexible and comfortable in an Agile environment
• Strong analytical and problem-solving skills
• Good technical documentation capabilities
• Ability to present and discuss solutions with technical stakeholders
• Strong willingness to continuously learn and apply new technologies and standards 📩 Interested? If you're an experienced Senior .
NET Developer with strong expertise in C#, .
NET, Java, Digital Identity, OAuth2/OIDC, Blazor, Vue.js and cloud technologies, we'd love to hear from you. Apply now or send your CV to hr@onetechsolutions.be