Senior Developer – .NET & Java

Our client, a leading organization in the energy sector, is looking for an expert developer to support critical infrastructure initiatives. This role focuses on developing and integrating secure authentication and authorization services within a complex digital landscape.

Responsibilities: develop, test, and document software components for user authentication and authorization services; create sample applications and technical guides to demonstrate integration within legacy and new systems; configure and extend off-the-shelf solutions such as access managers, API gateways, and directory services; promote continuous integration and deployment through release automation and configuration management; collaborate with technical stakeholders to translate requirements into robust security solutions; take ownership of backlog items and participate actively in squad team sprints.

Requirements: 8+ years in backend development with C#, .NET, and Java; professional experience with Vue.js, Blazor, and JavaScript; deep knowledge of security standards including OAuth2, OIDC, SSO, and MFA; practical experience with cloud platforms and container orchestration using Kubernetes and AKS; hands-on experience with SQL Server, LDAP, REST, JSON, and YAML; knowledge of Git and DevOps methodologies; proactive, analytical, and able to work independently; fluent in English with a good level of Dutch and/or French.

Nice to haves: experience with TypeScript, PowerShell, or Bash; knowledge of React or SAML2; familiarity with identity platforms such as Keycloak, ADFS, Ping, Okta, or EntraID; understanding of micro-services architecture and PKI.

Offer: start date mid-October; duration project length; work regime full-time; location Brussels; working model hybrid (2 days per week onsite); contract open to both permanent employees and freelancers.