Consultancy · Software · Integrations · InfrastructureConsultancy & development
I’m Henny Krijnen. I help business owners and development teams with technical decisions, software development and infrastructure. You can work with me for advice, implementation or both.I’m Henny Krijnen. I help business owners and development teams with technical decisions and software development.
From a client
Whatever you ask Henny, he always finds a clever solution. And he does it with clear communication, flexibility and very fast delivery.Whatever you ask Henny, he always finds a clever solution.
Translated from Dutch
Read the full recommendationHow I can help
Sometimes there’s already a plan. Sometimes there’s a problem that keeps coming back. I help work out the next step and can carry out the work.
Extending an existing system, replacing software or building something new? I look at what’s already there, discuss the trade-offs and put together a practical approach. That can be for a one-off question or as part of development.Review your existing systems and work out the technical approach together.
I build applications and automate processes, from an internal tool to the backend of a platform.Build applications and automate repetitive manual work.
Systems need to exchange information without someone having to copy it across. I build integrations and make sure errors can be seen and dealt with.Connect systems and automate data exchange.
Building the software is part of the job. I also set up environments, deployments and background processing, connecting development with day-to-day operations.Set up cloud environments, deployments and operations.
Selected work
Technical advice for Roadwise and 24Toll, alongside development and team leadership. Here’s a selection of my work.
Web · Mobile · Backend · Infrastructure
From a Symfony backend and Django middleware to React/Next.js interfaces and a Flutter app for warehouse staff. At eWarehousing Solutions, I combine hands-on development with leading the development team.At eWarehousing Solutions, I lead the development team and contribute to the WMS.
More about this workTollvignettes · Roadwise · 24Toll
Order automation, payment gateways and wallets for Tollvignettes. Recurring payments and external APIs for 24Toll. Plus Roadwise integrations and the infrastructure underneath.Automated order processing at Tollvignettes, payments at 24Toll and integrations with Roadwise.
More about this work
The person behind the work
I like working on the whole picture: the software, the systems around it and the people using it. You work directly with the person doing the job.
Including
PHP · Symfony · Laravel · Python · Django
TypeScript · React · Next.js · Flutter · Dart
Docker · Kubernetes · Terraform · Google Cloud
PostgreSQL · Redis / Valkey · RabbitMQ · MCP
How I work
We discuss what’s happening and look at the existing situation. That makes it clear what needs attention.
I explain the options and do the work. We discuss progress and any changes along the way.
I hand over the work with an explanation. We can continue working together on development and support.
Work together
Tell me what’s happening. We’ll work out how I can help.