Mobile app developer

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Mobile app developer

Use your incredible skills in mobile app development to take our softphone app Vialer to the next level.


We are looking for an experienced mobile app developer to join the team that works on building our high-quality iOS and Android apps. These apps are a softphone that works with our telephony platform VoIPGRID. As part of the Vialer team, you will work with a variety of international coworkers, so communicating and working in English is not a problem for you. You will contribute to maintaining the app, updating current features, and building new ones. 

As an app developer, you have experience working on developing on one big project. This is how you like to work, as opposed to working for 3rd parties. Next to doing the actual development work, you are a person who likes to think and plan together what needs to be built and how that should happen. You care about the development of the product rather than just doing the dev work that is needed. Knowing either iOS or Android will make you a great addition to our team. Knowing how both systems work is a huge bonus!

Your professional profile


  • know Swift and Objective C (for iOS developers)

  • know Java (for Android developers)
  • have experience with version control (we use Git)
  • are comfortable working independently on projects
  • are comfortable communicating and working in English

Bonus points if you:

  • have experience with SIP and VOIP technology

  • know both Android and iOS development
  • know another programming language besides the ones mentioned before
  • have experience in an agile way of working

About Spindle

Devhouse Spindle is a growing and ever-changing organization on a mission to connect the world using open and free communication. With almost 60 colleagues, we develop the tools that make this possible: our award-winning telephony platform VoIPGRID and our smart CRM system for teams called Lily. Spindle is located in Groningen, a beautiful city known for its innovation and the second fastest growing tech city in the Netherlands.

Working at Spindle

If you look around the office, you’ll notice we do things a bit different around here:

  • We organize ourselves using a system called Holacracy. We believe every colleague is able to contribute to the organization rather than relying on a traditional hierarchy. Having no managers comes with extra responsibility to take ownership of your work and set priorities that help to further the organization.
  • We work with a “build, measure, learn” mentality and open mindset. We recognize that not everything you do is going to work right away. We praise experimentation and reward trying something new, even if the lesson is to not try it again.
  • We have an open and transparent salary system. Every colleague is placed in the pathway and a level best fitting their education and experience. We encourage growth and have clear guidelines and expectations for doing so.
  • We are a diverse and inclusive team of international coworkers. We value the differences that each person brings to the table and think that it's those differences that strengthen our organization. 

What we offer

  • A relaxed and welcoming culture with celebrations, events, and trips

  • A competitive salary and good pension benefits
  • An annual study budget and study days for personal and professional growth
  • Two weeks leave when welcoming a new member to the family
  • Other benefits that contribute to your health, well-being, and work/life balance 

Join the team

Want to know more about this job, the employee benefits or Spindle? Don’t hesitate to contact Dick on 050-8009078 or

Please note that we are currently not hiring for remote work.