About Henny

I help work it out. Then I help build it.

I’m Henny Krijnen, the developer behind Krijnen Development. I’ve spent more than ten years working on software and the systems around it.

Henny Krijnen working at his desk, with his cat beside him

My work usually starts with understanding how things work today. Who uses the system, where does it get stuck and what needs to change? Then I agree on what to build with the client or the team.

I work across backend, frontend, integrations and cloud infrastructure. That helps me look at problems that span more than one part of a system. We can discuss the technical details, but you don’t need to know them to make a plan with me.

Direct contact

You discuss the work with me, and I do it. Questions and decisions go straight to the person involved.

Clear agreements

We agree on what needs to be delivered and discuss any changes to the approach or scope.

Beyond the handover

I can stay involved in development and technical support. We agree on the duration and arrangement together.

How I can help

Choose the tools to fit the work.

These are technologies I work with regularly. The choice depends on your existing environment and what’s needed.

Backend & middleware

PHP, Symfony, Laravel, Python, Django, Celery

Web & mobile

TypeScript, React, Next.js, Flutter, Dart

Cloud & delivery

Google Cloud, Kubernetes, Terraform, Docker, CI/CD

Data & integrations

PostgreSQL, MySQL, Redis / Valkey, RabbitMQ, REST APIs, webhooks, MCP

Work together

Something you could use a hand with?

Tell me what’s happening. We’ll work out how I can help.

Let’s talk