.NET Identity & Security Developer

Appsierra Group; Brussel; On-site; EUR 60,000 - 90,000; Full time

Job summary

Appsierra Group in Brussels is seeking a .NET Developer to implement authentication/authorization for our Digital Identity Fabric and to integrate with API gateways and directory services.

Work with IT and product squads, contribute to CI/CD pipelines, and deliver technical documentation and proposals. Strong English, Dutch or French communication skills are required and familiarity with modern identity platforms is a plus.

Qualifications

• Strong experience with C#, .NET, Java and RESTful APIs (JSON, YAML).
• Proficiency in UI development using Vue.js, Blazor and JavaScript.
• Solid knowledge of authentication standards (OAuth2, OIDC) and web security concepts (HTTPS, cookies, CORS, SSO, MFA).
• Experience with Kubernetes/AKS, Git, and DevOps/CI‑CD practices.
• Familiarity with LDAP, SQL Server and cryptographic concepts (symmetric/asymmetric keys).
• Excellent communication skills in Dutch and/or French and English.

Responsibilities

• Develop, test and document software components for authentication and authorization.
• Configure and extend off‑the‑shelf solutions such as access managers, API gateways and directory services.
• Promote and improve continuous integration and deployment pipelines using automation and configuration management.
• Collaborate with IT staff and product squads to understand integration needs and resolve issues.
• Participate in sprint planning, execution and backlog refinement within the squad.
• Prepare and lead workshops or meetings, delivering technical documentation and solution proposals.

Skills

C#

.NET

Java

RESTful APIs

UI Development

Vue.js

Blazor

JavaScript

OAuth2 / OIDC

MFA

Kubernetes

AKS

Git

DevOps CI/CD

LDAP

SQL Server

Cryptography concepts

Multilingual

Tools

Keycloak

Okta

ADFS

Ping

EntraID

React

Job description

Appsierra Group in Brussels is seeking a .NET Developer to implement authentication/authorization for our Digital Identity Fabric and to integrate with API gateways and directory services.

Work with IT and product squads, contribute to CI/CD pipelines, and deliver technical documentation and proposals. Strong English, Dutch or French communication skills are required and familiarity with modern identity platforms is a plus.