Senior Back-end Developer (C#)

Salary Competitive


We’re a growing team based in Copenhagen and the Netherlands, and we’re looking for a Senior Back-end Developer to join us on our journey

Welldium is a venture-backed HealthTech startup on a mission to support the shift in the focus of our healthcare system from treating symptoms to addressing root causes.

We help holistic healthcare practitioners by supplying their patients with high-quality supplements in a more convenient way. We bring transparency to the fragmented supplement industry.

The job

We are growing very fast - onboarding practitioners across most European countries and are ready to build Welldium 2.0. We need a technical profile to build the back-end of the new platform. 

Our ambitions are high and we need your help to realize them - get ready for an exciting journey! 


As a member of the development team, you will be involved in designing, developing and maintaining our main product in its new and improved version. For that it is a big plus if you have 7+ years of experience with:

  • Latest version of C#

  • Knowledge of CQS patterns and implementation with MediaTR

  • Worked with DDD, Clean Architecture/Onion Architecture projects

  • Developing efficient APIs

  • EF.Core, Sql Server and Azure


  • Develop backend features with good engineering practices

  • Develop and deliver high-quality software on a continuous basis with CI/CD based on Azure Cloud

  • Create Unit, Integration, and E2E tests


  • Enjoy working closely with the entire team to ensure that the site accomplishes the highest standards of quality and solves our customer needs

  • Follow Agile/Scrum principles

  • Are eager to drive a positive change in the healthcare system 

  • Are ambitious, have a strong inner motivation and a positive mindset 

  • Have a winning attitude - knowing that there are easy days and hard days and the ability to get through them both

What we offer you

  • The freedom to experiment and be creative in your own tasks

  • The opportunity to work in a growing startup with a proven business model that is ready for scaling

  • The opportunity to bring positive change to the healthcare system alongside passionate team members 

  • Flexibility. Want to work remotely - no problem. Want to work at the office - we have an amazing office in central Copenhagen surrounded by other Healthtech startups. 

  • A fun team! 

  • Chose your computer (Mac or Lenovo)

  • Free lunch, fruits and coffee

The practical details

  • Timeline — We are reviewing applicants and doing interviews on an ongoing-basis. We are looking for the right person to start on as soon as possible.

  • Location — Copenhagen or remote

If this resonates with you please apply here OR if it describes one of the most talented people you know, please share it with them.

For more information or questions please contact us at

Perks and benefits

This job comes with several perks and benefits

Free lunch
Free lunch

Enjoy a free catered lunch with your colleagues, every day.

Flexible working hours
Flexible working hours

Time is precious. Make it count. Morning person or night owl, this job is for you.

Free coffee / tea
Free coffee / tea

Get your caffeine fix to get you started and keep you going.

Free office snacks
Free office snacks

Peckish after lunch? We got your back with soft drinks, treats and fruit.

Near public transit
Near public transit

Easy access and treehugger friendly workplace.

Social gatherings
Social gatherings

Social gatherings and games; hang out with your colleagues.

See all 15 benefits

Working at

Welldium is a virtual supplement dispensary for holistic health care practitioners. Our online platform is made for the practitioners so they can easily find and collect their patient recommendations of their preferred supplements, so their patients can easily order exactly what they've recommended. Welldium’s foundation is build on a dream about “elevating the human experience through health”. We try to make our contribution to a more healthy world by providing a virtual dispensary for health practitioners and their patients. One of our key objectives is to make it easy for health practitioners to find and prescribe high quality supplements, and easy for the patient to buy the recommended supplements with one click. With the right supplements and tracking, the patients can achieve their health goals.

Read more about Welldium

company gallery image

Similar jobs

Backend Developer
EIVEE Copenhagen Full-time
Senior Backend Engineer
Recrue Copenhagen Full-time
Fresh out of University? Backend developer (Go Golang!)
UNIwise Aarhus Full-time
Database Developer
Simplyture Copenhagen Full-time
Backend Developer (Node.js)
Wiredelta Copenhagen Full-time