Senior Backend .NET Developer

Vision Healthcare NV; Haarlem; Hybrid; EUR 60,000 - 80,000; Full time

Benefits offered by this job

26 paid vacation days

75% pension contribution

Monthly allowances for internet and phone

Travel cost reimbursement

Free daily lunch

Mental well-being support

Job summary

A growing healthcare technology firm in Haarlem is looking for a Senior Backend Developer to enhance their backend platform. This role involves working with microservices and .NET 8 on Azure, addressing scaling challenges, and designing solutions collaboratively. You will write maintainable code, ensure software quality, and contribute to architecture design. The company offers hybrid working, generous vacation days, and strong development opportunities.

Qualifications

• Hands-on experience with microservices, .NET 8, SQL and Azure.
• Experience moving data and integrating systems.
• Ability to design solutions across the full development cycle.

Responsibilities

• Write clean, high-quality, and maintainable code.
• Collaborate with the team to design solutions and solve problems.
• Contribute to architecture and system design.
• Ensure software quality through testing and reviews.

Skills

microservices

.NET 8

SQL

Azure

problem-solving

English fluency

Tools

Azure DevOps

NServiceBus

RabbitMQ

ElasticSearch

CommerceTools

Job description

As a Senior Backend Developer at Vision Healthcare, you’ll join a focused team of four backend engineers. Your role goes far beyond writing code—you’ll shape the system architecture, anticipate scaling challenges, and help define the future of our backend platform.

We value technical expertise and fresh ideas, giving you both the freedom and the time to experiment with new frameworks, tools, and approaches that can make a real impact.

Your job in a nutshell

Our backend team builds, maintains, and continuously improves Microservices backend – the core system that powers orders, invoices, customers, payments, subscriptions, and more. Coltan consists of microservices written in .NET 8, running on Azure, and deployed through Azure DevOps pipelines.

For service-to-service communication we use NServiceBus and RabbitMQ; data is stored in SQL Server and ElasticSearch. You’ll also work with Adyen for payments, Commerce Tools and various Azure components like Service Bus, Key Vault, etc.

Your responsibilities:

• Write clean, high-quality, and maintainable code
• Collaborate with the team to design solutions and solve problems
• Contribute to architecture and system design
• Ensure software quality through testing and reviews

What you’ll be working on:

Much of our backend is custom-built, but we’re actively moving functionality to SaaS solutions where it makes sense. For example, we’re migrating customer data from an event-sourced microservice into CommerceTools, a platform that manages customers, carts, products, discounts, and orders.

This migration involves moving millions of records, writing temporary support software, building new microservices, and solving plenty of technical challenges along the way. Projects like these give you the opportunity to make an impact while tackling real-world scaling and integration challenges.

Why it’s great to be a Backend Engineer at Vision Healthcare:

We keep our backend team small and efficient, so decisions are fast and improvements happen continuously. You’ll spend your time designing and building—not sitting in endless meetings.

Our minimal meeting culture and focus on shipping features means you’ll actually see your work in production and contribute directly to the evolution of our platform.

This is you:

• You enjoy working across the full development cycle—designing, building, and deploying features end to end.
• You have hands‑on experience with microservices, .NET 8, SQL and Azure.
• You thrive on solving complex technical challenges.
• You’re fluent in English (Dutch is a plus).
• You bring enough relevant experience to confidently call yourself a Senior Backend Engineer.
• You currently live in the Netherlands.

This is what we offer you:

• Hybrid working with flexibility for office and home.
• 26 paid vacation days per year.
• 75% pension contribution from us;
• Great opportunities for personal learning & development.
• Monthly allowances: €20 internet + €20 phone.
• Travel cost reimbursement for office days.
• Unlimited access to mental well‑being support via OpenUp.
• Free daily lunch with a fully stocked kitchen.
• Regular team events, parties, and Friday afternoon drinks.

Interested? Let’s go!

• Apply with your CV and motivation letter via the button below.
• We’ll start with a short introductory call with Diederik Oostburg.
• If there’s a match, you can expect a maximum of two interview rounds.
• Before the second interview, we’ll ask you to complete a small assignment.

About Vision Healthcare (VHC)

Vision Healthcare (VHC) is a fast‑growing European company with a broad portfolio of direct‑to‑consumer brands. We manage a range of supplement, wellness, and beauty brands including Flinndal, Purasana, Vitaminen op Recept, VitaminExpress, Bärbel Drexel, and Vitamaze.

Our Haarlem office is the e‑commerce engine behind these brands — and we’re growing fast. That’s why we’re looking for another talented developer to join our team.

Seniority level

Mid‑Senior level

Employment type

Full‑time

Job function

Information Technology

Industries

Pharmaceutical Manufacturing