Mobile App Developer

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Mobile App Developer

At the end of 2013, we got the bold idea to build an app for our telephony platform VoIPGRID. The app allows users to be available anywhere, anytime on their business number. In February 2014, the first version of the Vialer app was launched for iOS and Android. We continue improving the apps with the newest technology. For example, we just implemented CallKit integration, making the iOS app function just like the native iOS dialer would.


What will you do

In your role as a mobile app developer, you will be responsible for improving our open source Vialer apps, taking into account maintainability, scalability and stability. You are expected to have a strong vision on mobile development in general and on iOS in particular. Your focus will be on iOS, but a basic knowledge of Android development will help to keep the apps moving at the same speed.

We are currently working on the integration of encrypted calling, video calling, and converting the codebase from Objective-C to Swift. But, since we are a fast moving company, there is no telling what challenges will be around the bend.

If you are not already working in telecommunications, you will be introduced to the fascinating world of Voice over IP (VoIP) and the Session Initiation Protocol (SIP) that underlies most digital communication. We've created our own open source library that we maintain and support: the VialerSIPLib, that we use to integrate PJSIP with iOS. You are encouraged to share your knowledge with the open source community.

Your profile

If you recognize yourself in the following profile, we might be a good match!

  • You have several years experience in iOS development in Objective-C and/or Swift

  • You are experienced in object oriented programming

  • You have experience in working in an agile environment

  • You have a MS or equivalent degree with several years of related experience

    Extra points for:

  • Experience with Android development

  • A basic knowledge of the C programming language

  • Experience in working with VoIP/SIP

What we offer

Besides the primary salary, you can also enjoy:

  • An hour of lunch time in which we enjoy a delicious catered lunch
  • Healthy stuff: a Spindle company bike and a sports and wellness subscription
  • A good pension insurance
  • An annual study budget to expand your knowledge
  • A workplace which you can arrange the way you like it. We want you to be able to work at your best and provide all the stuff you need to do so
  • A relaxed and welcoming culture with celebrations, events, hackathons, and trips
  • Great time off benefits when a new child arrives in your family

Does this sound like the next step in your career?
Surprise us with your motivation and CV. You can also send us your motivation in Dutch. We're looking forward meeting you!