Student developer

Would you like to develop modern solutions for telephony, chat and customer service which help thousands of customers every day?Firmafon is looking for a student developer for our development team.

We have built a telephone company from scratch

We receive phone calls from our upstream provider via the SIP protocol.

We display the call in our React/Redux web app where our customers can easily transfer the call and see previous calls from the same number.

The calls can be answered via mobile phone or in the browser using WebRTC.

The React frontend can also be accessed from our Electron-based desktop app for better headset support.

We also support written communication via our Elixir-based chat server.

Our Ruby on Rails application handles call routing configuration, subscription management, billing, number porting, shipping of SIM cards etc.

Most of it runs on Amazon Web Services.

You may get involved with all parts of our tech stack, depending on your interests and skills. If you don’t know the technologies already, you will learn about them as you go along.


Experience with one of the technologies mentioned above, or with web development in general, is a plus. But most important is that you have a bright mind and are curious to learn.

You are: 

  • Focused and independent
  • Curious and willing to learn new technologies
  • Responsible and careful
  • Easy-going with a sense of humour


Firmafon has been surfing the start-up wave since 2010. With 30 employees and 4000 customers, we have kept the culture and excitement from when we were a small start-up. We love talking to our customers and use their feedback to move fast and develop new features.

We offer:

  • A wide range of challenges within different technologies
  • A way to influence the product
  • Freedom with responsibility
  • An informal atmosphere
  • Bright office in Østerbro near KU Nørre Campus
  • A delicious lunch scheme

Read more about us on (in Danish).


Send your application or any questions about the position to Senior Tech Lead, Christian Schmidt,, or call 28 21 16 18. We will be reviewing the applications as they come in.