Senior Mobile Developer (iOS/Android)


About the role

Our mobile apps are natively built by the current Engineering team using Java/Swift. They include most of the features of our platforms’ Web version, but not all of them. Your first job will be to add the missing features and to take a critical look at the current GUI/workflows and improve where needed.

For the long term, our ambition is to migrate the existing apps to a cross platform solution. You will research framework options (like React Native & Flutter) and build and demo Proof of Concepts. Then, depending on the decision that is made, start the migration process. All while making sure our current user base keeps a flawless mobile experience by implementing automatic testing and (pre-emptive) monitoring.

About us

We are a telecommunications start-up founded in 2014 in the Netherlands. We offer a SaaS telephony platform that revolutionises the way freelancers and small businesses communicate. After 7 years of finding product market fit (over 7.500 active users), we are now transitioning to scale-up.

Our passion is designing and building great software. How? By not just doing what everyone else does; but by reinventing the wheel; because we can. Our platform is completely designed, built, and managed in-house using bleeding-edge technology. This in turn makes us flexible and scalable. Best of all: we do not have to worry about maintaining decades of legacy code.

We currently operate from a fantastic office space in Rotterdam (right next door to the central train station) with a team of 10 talented colleagues.

As a Mobile Developer, you will:

  • be part of a multidisciplinary team that ships great, intuitive software
  • be responsible for adding new features to our mobile apps
  • take technical and functional ownership of your product
  • use a data-driven approach to suggest tweaks, improvements, and optimisations
  • implement a Test Driven Development approach
  • research migrating the apps to a cross platform framework

For this role, we need you to have:

  • +/- 4 years of experience building Android apps (Java / Kotlin)
  • and/or +/- 4 years of experience building iOS apps (Swift)
  • experience with REST API’s
  • experience with automated testing (XCTest / Espresso)
  • an interest in researching/implementing cross platform frameworks
  • a good level of English (both spoken and written)

It would be nice if you have:

  • a related bachelor’s degree
  • experience with popular libraries/tools like RxJava & Firebase
  • experience with Play Store / App Store workflows
  • experience with CI/CD workflows
  • experience with cross platform frameworks

We offer the following:

  • A competitive salary
  • A yearly budget of €750,- for self study
  • 25 vacation days per year
  • Free lunch
  • MacBook Pro & Smartphone
  • Regular team activities & travel to the Netherlands
  • A chance to take ownership of your product

Interested in this job?

You can send your application, consisting of a motivation letter and CV, to Mark Karsch via the application form at the bottom of this page. You can also contact Mark for questions about the position via

We are always looking for the candidate that most closely matches the above profile. However, if you are not fully meeting the requirements, but still think, that we should choose you – don’t hesitate to still apply or contact us!

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