AGENTIC CODING FOR .NET TEAMS | 20+ YEARS .NET EXPERIENCE

Your team has AI tooling.
But the way you work hasn't changed.
More code, more review, not more features shipped.

I help dev teams who find that AI tooling isn't delivering real results yet, by joining the sprint and discovering together how AI actually helps. So you ship faster, without sacrificing quality.

Listen Where is your team now?
Join Adapt workflow in the sprint
Handover They can take it from there
Schedule an introduction View my approach
Chaïm Zonnenberg, .NET developer and agentic coding specialist
From September: room for 1-2 new teams
"Got up to speed exceptionally fast and consistently made the right decisions" - Cees, Software Architect at multinational
"Proactive is his motto. Picks up what matters and doesn't let go until it's resolved" - Robert, IT Team Lead at financial institution
"Advised the board and shaped the software architecture direction" - Chantal, IT Operations Director

Sound familiar?

Your developers are experimenting with GitHub Copilot, Claude Code and Cursor. It isn't making a measurable difference yet. The output stays the same, only the tooling changed.

Your backlog is growing, your velocity isn't. AI generates more code and review pressure grows with it. It feels like the tooling changes while the way you work stays put.

You're not looking for a course or workshop. You're looking for someone who joins your sprint and shows how it's done.

Schedule an introduction
Chaïm Zonnenberg

I'm Chaïm Zonnenberg. 20+ years in .NET, 2x cum laude university degree. I build Invullen.nl entirely with Claude Code and use it daily for maintaining Factuur-Assist.nl (135+ customers). This is daily practice, not theory. I join your sprint 2 days a week and transfer that workflow.

More about me

APPROACH

How I speed up your .NET team with agentic coding

I bring agentic coding to your .NET team. No training course. I join your sprint and show how it's done.

Agentic coding for .NET teams

I join your team and make agentic coding work: AI agents generate production code, you stay in control. With Claude Code, GitHub Copilot or a multi-provider setup, whatever fits your team. While I ship features alongside your team, they take over the workflow. By the end they work faster and with more confidence than before the engagement.

See the approach

Proof

2 own SaaS products

developed daily with Claude Code

Schedule an introduction

Also specialized in

Identity & SSO

Is an enterprise deal stuck on a security review or an SSO requirement? I build SSO and SCIM into your .NET SaaS so you get through it, without your team having to become identity experts.

More on SSO & SCIM

Technologies I work with

Claude Code GitHub Copilot .NET C# Azure SQL Server OpenAI Semantic Kernel OpenID Connect
Schedule an introduction

How we work together

From experimenting to agentic coding in three steps
1
Introduction

A 30-minute call. I listen, ask questions about your stack and your team, and give an honest assessment of where the gains are and whether I'm the right fit.

2
Build alongside & demonstrate

I dive into your codebase, set up your AI agent for your project and ship the first feature within a week. Your team sees agentic coding in action.

3
Handover

After the engagement your team works differently. Faster, with more confidence in AI tooling. Workflows, prompts and conventions are in place. I make myself redundant. That's the goal.

Read the full approach

Experience & references

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

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
Previous clients
ABN AMRO
PGGM
Zepcam
Van Lanschot
Florius
Moneyou
DTZ
Kadenza
Hobaho
Own SaaS products
Factuur-Assist.nl 135+ customers

Invoicing app for freelancers and small businesses. Simple and fast invoicing.

View product
Invullen.nl Pilot 2026

Exploratory questionnaires for coaches and trainers. Know where your participants stand before the session.

View product

From practice

Articles on agentic coding, AI adoption, .NET and identity. Honest about what works and what doesn't. (Articles in Dutch.)

Nagebouwde GitHub pull request van 'ai-agent' (9 commits, 42 gewijzigde bestanden), met 'Review required, no reviewers assigned' en 'No one assigned', en in oranje handschrift 'Wie draagt verantwoordelijkheid?' over de groene 'Merge pull request'-knop.
AI-adoptie 23 juni 2026 · 6 min

Agentic coding: wie is verantwoordelijk voor de code van een AI-agent?

Agentic coding draait niet om je codebase, maar om eigenaarschap: wie is verantwoordelijk voor de code die een AI-agent produceert?
Infographic: developers voelen zich 20% sneller met AI maar zijn in het METR-onderzoek 19% trager
Agentic coding & workflow 17 juni 2026 · 5 min

Hoeveel sneller ben je echt met AI? Gevoel versus de cijfers

Developers voelen zich met AI zo'n 20% sneller. Een METR-onderzoek mat 19% trager. Waar dat gat zit, en waar de echte tijdswinst dan wel vandaan komt.
Screenshot van een AI-dieetcoach die een doodnormale maaltijdlog blokkeert wegens een safety filter en terugschakelt naar Opus 4.8
Agentic coding & workflow 15 juni 2026 · 4 min

Wat doe je als je AI-model morgen weg is?

Eerst blokkeerde mijn AI-dieetcoach een doodnormale maaltijdlog, daarna ging het hele model wereldwijd op zwart. Je AI-model is een afhankelijkheid geworden.
All articles

Frequently asked questions

What is agentic coding?

Agentic coding means building software with AI agents that work autonomously in your codebase: generating code, running tests, refactoring. With tools like Claude Code, GitHub Copilot and Cursor. You specify, review and steer; the agent does the work.

Which teams do you work with?

.NET teams that already experiment with AI tooling and don't see a real speed-up yet. From scale-up to enterprise.

Do you work on-site or remote?

Both. Mostly on-site, some remote. I'm based in the Utrecht area and take on engagements within about an hour's travel.

How quickly do I see results?

Within the first week I ship a feature with Claude Code in your codebase, so your team sees agentic coding work live.

All frequently asked questions

Chaïm Zonnenberg

Chaïm Zonnenberg

.NET Developer | 20+ years

From September: room for 1-2 new teams

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.

Schedule an introduction Know today if I'm the right fit LinkedIn

View frequently asked questions