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Determined and Innovative .NET Backend Developer

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Are you passionate about pushing tech to the limits? Does it thrill you to solve problems that everyone else thought were unsolvable? Would you like to develop technology that will affect thousands of users? Do you fancy working with some of the brightest minds in the field?    

We’re looking for an explorative backend developer to join our Connections Team in the heart of Copenhagen. The team is responsible for connecting our service to banks’ APIs across the Nordics. We do this by reverse engineering the banks’ mobile APIs and connecting to the banks’ new PSD2 APIs. 

These APIs are often poorly documented and tricky to connect to. It can sometimes feel like sampling IKEA furniture in the dark. It requires a more exploratory way of coding  instead of coding by the book. 

Even though things can be complex, the team has managed to connect to over 350 APIs. Their success lies in the brilliance of the team as a whole. They are extremely resilient (or should I say stubborn 😏?) and insanely smart - ranging from a PhD in geophysics to a prodigy reverser who just happens to be 14 years old.  

The bank connections are available to our clients through our company, Nordic API Gateway. With this, everyone can automate accounting services, initiate payments and build financial services that people love. With thousands of end users, Nordic API Gateway is used by clients such as Danske Bank, Pleo, DNB and Dinero.

As our new backend developer on the Connections Team, you’ll be a key player in expanding our reach and stabilising our connections. You’ll work closely with our reverse engineers, so if you are a developer with an interest in reversing, cryptography and CTF - this is the job for you! 

We expect you to:

  • Have experience with C# or Java. 
  • Have experience with integrating different APIs.
  • Be hard working and dedicated to the product and high-quality code.
  • Have real experience with delivering high-quality and reliable software.


  • Knowledge of cryptography in .NET and different serialisation formats.
  • Experience with Azure and Python.

Perks and benefits:

  • You’ll join our company at a super exciting time. We have the agility of a startup but the funding of a scale-up.
  • Full support for professional development in any form. Books, 1:1, mentoring, online seminars and conferences. When you grow, we grow 🌱
  • Attractive office space in downtown Copenhagen.
  • Inspiring colleagues that strive for perfection but never forget to have fun while doing it.
  • Warm coffee to keep you energised. Friday beers to keep you happy.

Are you ready to take off with us?🚀 Send your CV or Linkedin. Show us something you’re proud of (share code, Github projects, etc.), so we have a solid foundation for our tech talks.

If you have any questions, don’t hesitate to contact our DPO and Tech Team Lead, Christian Panton, at cp@spiir.dk.

Or, know someone who would be a perfect fit? Let them know!

Mejlgade 48
8000 Aarhus Directions View location page


Wilders Pl. 15A
1403 København Directions stg@spiir.dk View location page


Jana z Kolna 11
80-864 Gdańsk Directions View location page

Why should you join Spiir & Nordic API Gateway?

At Spiir & Nordic API Gateway you’re not only a part of a vibrant workplace. As a part of our team, you’ll join a FinTech family who’s dedicated to help others managing their personal finance in a smart and simple way. 

or FunTech? There is plenty of space to innovate, laugh and have fun in our offices.

Get a sneak peak of what's going on inside the company and meet some of the brilliant minds behind our growing success:

  • A strong team spirit

    Despite being a mixed bunch of talents with a wide range of skills and expertise, Spiir has an awesome team mentality. We love working in teams, being social and celebrate our successes together. 🎉🥂

  • A fast-moving FinTech

    Too early for champagne? Nope! 🍾 We currently have more than 370.000 Spiir users in Denmark and we’re just about to expand our services to the rest of the Nordics. We strive to reach 750.000 app users in 2020 and we aim to become the leading PSD2 infrastructure in Europe with Nordic API Gateway.

  • A low-key and relaxed workplace

    From passionate developers to digital strategists, there is room for everyone at Spiir. We’ve created an informal workplace where diversity, humor and endless high-fives are a natural part of the everyday office life.

  • Flexible working hours

    Morning person or not? We don’t care. At Spiir you’ll get the freedom to structure your working hours as you please.

    Who doesn’t like to work from home once in a while? 😎

Who are we?

We’re a dedicated, talented and energised team. We’re all passionate about Spiir, and it’s our core believe that personal finance should be less boring and more fun.

With the mission to create a strong PSD2 infrastructure platform, we’ve also launched Nordic API Gateway, which is set to make innovation easier for everyone. Nordic API Gateway helps fintech companies and start-ups create awesome services for both consumers and businesses.  

Already working at Spiir & Nordic API Gateway?

Let’s recruit together and find your next colleague.

  • Alex Langberg Jensen
  • Alex Voigt Hansen
  • Christian Dias Løgberg
  • Christian Panton
  • Christian Probst
  • Christian Victor Andersen
  • Christie Holm Kristensen
  • Claus Farsinsen
  • Dobrawa Radecka
  • Edgaras Ausvicas

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