Senior.NET Developer

About the Role NISH Tech BV is looking for an experienced

Senior .NET Developer with Java experience

for a project within the

Belgian energy sector .

You will work on secure

Digital Identity, authentication and authorization solutions

used within a critical infrastructure environment. The role involves software development, system integration and collaboration with technical teams.

Key Responsibilities

Develop, test and document software for

authentication and authorization .

Develop sample applications and code examples for integrating identity services.

Develop and configure extensions for

access managers, API gateways, reverse proxies and directory services .

Support integration with both existing and new applications.

Improve

CI/CD

processes through automation.

Work with IT teams to understand technical requirements and solve integration issues.

Participate in

Agile/Scrum

activities and sprint planning.

Take ownership of assigned development tasks and backlog items.

Participate in technical meetings and workshops.

Propose, present and validate technical solutions.

Learn and apply new technologies and standards when required.

Must have requirements

9+ years of relevant professional software development experience .

Strong experience with

C#, .NET and Java .

Experience developing

REST APIs and integration services .

Good knowledge of

REST, JSON and YAML .

Experience with

JavaScript .

Experience with

Vue.js and/or Blazor .

Experience with

LDAP and SQL Server .

Good knowledge of

OAuth2 and OpenID Connect (OIDC) .

Understanding of

SSO, MFA, HTTPS, cookies and CORS .

Understanding of

symmetric and asymmetric cryptography .

Experience with

Kubernetes and AKS .

Good knowledge of

Git and DevOps .

Strong analytical and problem-solving skills.

Ability to work independently and document technical solutions.

Comfortable presenting technical solutions to technical stakeholders.

Nice to Have

TypeScript

PowerShell

Bash/Shell

React

SAML 2.0

PKI

Hash functions and keystores

Experience with

ADFS, Keycloak, Ping, Okta or Microsoft Entra ID

Experience with

microservices architecture

What We Value

Pragmatic and solution-oriented mindset

Positive and constructive attitude

Independent and responsible way of working

Flexible and adaptable

Strong communication skills

Willingness to learn

Good analytical and problem-solving skills

Ability to document and explain technical solutions

Languages

English:

Good professional level

Dutch and/or French:

Good professional level

Practical Information Location:

Brussels, Belgium

On-site:

2 days per week

Work regime:

100%

Vacancy:

1

Expected start:

Mid-October, and no later than mid-November.

Why Join This Project? Work on an important technology project in the

Belgian energy sector , contributing to secure Digital Identity solutions and critical infrastructure.

You will work with a diverse team, gain exposure to modern technologies and contribute to the ongoing

energy transition .

About NISH Tech BV NISH Tech BV connects experienced technology professionals with challenging opportunities across Belgium and international technology environments. We focus on matching strong expertise with projects where professionals can create meaningful impact.