Senior .NET Developer | AI & Identity

Why hasn't this been solved yet?

You've already searched for a senior developer. But AI integration, SSO and complex architecture requires someone who has done this before. Not a generalist who does it on the side, but someone who is productive within days.

Surely specialist work shouldn't sit on the backlog for months just because you can't find the right person?

Meanwhile, your competitor is moving ahead. You don't want to show up at the next steering committee without answers again.

This is what you get

A working solution within weeks. Not a plan that takes months.

Stakeholders who get a clear answer at the next steering committee.

A team that can carry on with new knowledge and tooling.

Services

What I help teams with

AI Integration

Your competitor already has a chatbot. Your team wants one too, but nobody has the experience. I build a working POC fast, so you can show the next steering committee that your team is moving on AI.

Semantic Kernel OpenAI Azure AI Prompt Engineering

Identity & SSO

Your enterprise client demands SSO. The deal is under pressure. I build enterprise-grade authentication, so that deal no longer falls through on SSO and your client gains confidence.

OAuth2 OpenID Connect SCIM Azure Entra ID

Generative AI Development

Your backlog is growing faster than your team can keep up. I deliver complex .NET features with AI tooling in a fraction of the lead time. But I also show your team how: they learn to work with Claude Code and Copilot, so your velocity goes up permanently.

Claude Code C# .NET 10 GitHub Copilot

Also: Azure Cloud, CI/CD pipelines and frontend (Vue, Angular). Builder of own SaaS products: Factuur-Assist.nl (135+ customers) and Invullen.nl.

How we work together

From problem to working solution in three steps

Introduction

A 30-minute call. I listen, ask questions, and give you an honest assessment: whether I'm the right fit and how I'd approach it.

Fast onboarding & first result

I dive into your codebase and deliver a concrete result within the first week. No months of onboarding. At ABN AMRO I was productive within days.

Push through

Those complex features your team kept postponing? I push through. I switch quickly between architecture and code, and transfer knowledge so your team can carry it forward.

More about who I am and how I work

Experience & references

Specialist .NET Developer AI Integration GenAI Development Identity & SSO

20+ years at ABN AMRO, PGGM, Van Lanschot & more · 2x cum laude university

Complex migration project delivered successfully

"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

Proactive from day one

"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

Advised the board on architecture

"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