Freelance .NET Developer Nederlands

Hi, I'm Chaïm

I help teams that want to integrate AI or SSO but don't know where to start, so it actually makes it to production without endless research.

With 20+ years of experience in .NET, Azure and enterprise software I build reliable solutions. From chatbots and AI integration with Semantic Kernel to SSO/SCIM with Azure Entra ID. I handle the full process: from design to production.

Get in touch View my work
20+ years experience .NET & Azure AI integration SSO/SCIM C# Available 2 days/week
Chaïm Zonnenberg

Fun fact: this website is a C# web app on Azure Kubernetes Service, built with Claude Code. No CMS.

Services

What I help teams with

AI Integration

Integrating AI into existing .NET applications. From prompt engineering to Semantic Kernel implementations. Multiple chatbots already built.

Claude Code Semantic Kernel OpenAI Azure AI

Identity & SSO

Implementing OAuth2, OpenID Connect and SCIM. Multiple secure token services built. Enterprise-grade authentication and user provisioning.

OAuth2 OpenID Connect SCIM Azure Entra ID IdentityServer4 OpenIddict

Backend Development

Robust APIs, services and integrations in C# and .NET. Focus on quality and maintainability.

C# .NET 10 REST APIs SQL Server

Azure Cloud

Setting up Azure environments, deploying and managing applications. From App Services to Kubernetes.

Azure Docker Kubernetes (AKS) App Services

DevOps & CI/CD

Setting up pipelines, automating releases, infrastructure as code. Azure DevOps as foundation.

Azure DevOps CI/CD YAML Pipelines Docker

Frontend Development

Building Vue and Angular frontends. Responsive, user-friendly, integrated with backend.

Vue 2/3 Angular TypeScript

How I work

Claude Code

I run multiple Claude Code agents daily across different GitHub workspaces. This makes my work faster and the output better.

Short iterations

Deliver something quickly, process feedback, move forward. This way you see results fast and we keep the direction sharp.

Own products

Besides client work, I build my own platforms. What I learn there, I bring into your project.

Own products

Self-designed, built and running in production on Azure

Factuur-Assist.nl

Online invoice generator for freelancers and small businesses. Create a professional invoice in a few steps. 130 paying customers.

.NET Azure OpenAI
View Factuur-Assist.nl

Invullen.nl

Online platform for coaches and trainers to create questionnaires and gain insight into participants beforehand. Recently launched, in active development.

.NET Azure Semantic Kernel
View Invullen.nl

I designed, built and run these products in production on Azure.

Experience & references

"Chaïm managed a large and complex migration project for us and brought it to a successful conclusion. He got up to speed exceptionally fast and consistently made the right decisions based on his deep knowledge of .NET and SQL Server."

— Cees, Software Architect at multinational

"Chaïm is a true professional. One you don't want to let go from day one. Proactive is his motto. He picks up what matters and doesn't let go until it's resolved."

— Robert, IT Team Lead at financial institution

"Chaïm filled the advisory role of Software Architect at our organization. He advised the board and gave direction to the software architecture. He also guided the development team into the world of microservices and brought knowledge about Microsoft Azure."

— Chantal, IT Operations Director

Previous clients
ABN AMRO
PGGM
Zepcam
Van Lanschot

Tech Stack

AI
Claude Code Semantic Kernel OpenAI Azure AI Foundry
Identity
OAuth2 OpenID Connect Azure Entra ID SCIM IdentityServer4 OpenIddict
.NET & Cloud
.NET 10 C# Azure Docker Kubernetes (AKS) SQL Server
Frontend
Vue 2/3 Angular TypeScript
DevOps
Azure DevOps CI/CD Playwright
Chaïm Zonnenberg

Chaïm Zonnenberg

Senior .NET Developer

Available 2 days per week

Email

info@software-assist.nl

Phone

+31 6 51914406

LinkedIn

linkedin.com/in/chaimzonnenberg

Location

Based in the Utrecht area, The Netherlands. Available for on-site and remote work.

Email me Call me LinkedIn

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