Senior software developer C#

• 24 March 2026

Senior software developer .NET 

Will you lay the foundation for a future-proof, innovative platform that optimally supports mental healthcare professionals?

At HCI, we are building a new, complex electronic patient record for mental healthcare. This is not a greenfield hobby project, but software that will soon be used daily by thousands of healthcare professionals. The current system is running, so you will be building our new platform while business continues. Ambition: live in 2–3 years. Some say that is impossible. We think it is.

What are you going to do

At HCI CRS, you develop software that makes a difference in mental healthcare every day. You ensure that practitioners in mental healthcare can rely on systems that work — stable, secure, and user-friendly. As a Senior Software Developer, you build the new Electronic Patient Record (EPR) SaaS platform and contribute to innovative solutions that support thousands of healthcare professionals.
You balance long-term technical improvements (architecture, integrations, performance) with short-term functional needs. At the same time, you ensure the reliability required in a mental healthcare setting, despite all the changes.

In this role, you combine hands-on development with strategic thinking regarding technical innovation and the professionalization of our development practices. You act as a sparring partner for fellow developers and product management and contribute to the further development of (agile) engineering practices.

Briefly:

• You will help build a new platform (C#/.NET, Azure, microservices) that will replace the current EHR.

• You primarily write new code (±90%), not a bugfix factory.

• You work on integrations (API) with other healthcare systems — stable and secure, because it simply has to work.

• You contribute to the architecture and make choices that will still make sense in 5 years.

• You translate feedback from mental healthcare practitioners into concrete improvements in the product.

• You help colleagues improve (code reviews, brainstorming, knowledge sharing, growth mindset)

And finally
You aren't here to just clock up tickets. You're here to build something that needs to be right — technically and substantively. And yes, sometimes that involves solving a puzzle while keeping things running. If that gives you energy, we should just have a chat.

Where do you end up?

HCI CRS is one of the four business units of Health Cloud Initiative (HCI) — a network of more than 200 colleagues with a passion for healthcare. Together, we are building innovative software that ensures healthcare providers in mental healthcare do not have to deal with IT.
Our development department consists of 9 developers (Dutch & English), a Product Owner, and a software tester, divided across two teams: the core team working on the current application, and our platform team building the new, innovative, scalable SaaS product. The platform team will become your team. Our Head of Development, Femi, loves working driven by a shared passion for learning and innovation. No ego, just great substantive sparring sessions and bursts of laughter.

We work closely together through planning sessions, refinement, and code reviews, while individual tasks are performed independently. Decision-making is not very hierarchical: the Tech Lead and senior developers drive the technical choices, the Product Owner determines the priorities, and we collaborate intensively with Product, Support, and Consultancy.

Our tech stack C#, SQL, Azure services, Blazor, AI LLMs & our architecture/design principles: Microservices, Mediator Pattern, event-driven design

What we offer you

• Salary: €4.000 to €6.500 gross per month based on 40 hours.

• 8% holiday allowance, internet allowance and a good pension plan.

• Hybrid working: at our nice office in Amsterdam and 2 days from home.

• 25 vacation days, the option to purchase an additional 10 days.

• Travel allowance, home work allowance of €2,45 per day and home work place allowance of €500 every two years.

• Learning & Development: Ample room to develop yourself, with attention to your professional and personal growth.

• Room to grow towards Tech Lead, Architect, or Specialist

• Job satisfaction: a collegial team with a passion for care and technology.

• A close-knit, people-oriented team with humor and collegiality

• Healthy fun: fresh fruit every day, lunch together and fun team outings.

• Work for the market leader in healthcare IT: 5.000+ healthcare practices, 4+ million end users – impact at scale.

What you bring

You have a passion for applying AI in software solutions!

You dare to say “this can be done better” — and then fix it. You work perfectly well independently but get energy from inspiring others. You actively seek collaboration and communicate clearly with developers, product, and other teams. You maintain a balance between stability and innovation and contribute ideas on how things can be improved — technically and in terms of working methods. You visibly contribute to a growth mindset: you ask questions, challenge colleagues, share knowledge, and continuously help the team take the next step.

• 5 years of experience building scalable complex software

• Experience with C# / .NET (8.0 and up), SQL (relational data modeling), ASP.NET (core/Web API)

• Experience with developing and maintaining API integrations and integrations in complex IT environments (healthcare systems, EHR/ECD)

• Experience with CI/CD (eg, Azure DevOps, Git pipelines), Git, Agile/SDLC

• You understand the implications regarding security, stability, and performance in enterprise applications.

Nice-to-have:

• Knowledge of healthcare standards such as HL7 or FHIR, Azure cloud services

• Experience with containerization, event-driven architecture, or Domain-Driven Design, or modernizing legacy systems

Have you become enthusiastic?

Does this sound like your next step? Apply via vacancies@hci-software.com and add your CV and a brief motivation.
Questions? Call our recruiter Babs Bloemsaat on 06 – 47894370.

This is what the process looks like

Step 1 — Introduction (30 minutes)
Step 2 — Technical interview
Step 3 — Soft skills interview
Step 4 — Offer

We welcome applications from everyone. Even if you don't check every box, we value your motivation, eagerness to learn, and drive to build together just as much.
Acquisition in response to this vacancy is not appreciated.

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