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Android Developer

Closing date
15 Sep 2021

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Technology & New Media
Contract Type
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Job Details

Since our launch in 2012, we've been on a mission: to make digital identification simple and secure for everyone, and everything. In that time, we've expanded constantly, and been joined by over 150 incredible people, all with the same vision. We've grown in other ways too - we raised $35m in our Series A funding round, and launched our game-changing authentication platform.

Our technology is now being used by hundreds and thousands of users worldwide, including some of the world's leading financial institutions.

And this is just the beginning. Over the next year, Callsign will double in size as we continue our mission to make every web, mobile and physical interaction seamless and secure.

We can't do that alone, though. That's why we're looking to hire the brightest, most inquisitive minds out there: the people who want to help us change the rules of identity - and have the skills and passion to make this mission a reality.

Does that sound like you? Let's talk.

Skills and Requirements:
  • You know all the Android Development fundamentals
  • You are familiar with the UI framework (all available Layouts and Views)
  • You developed an Android app with the use of 3rd party libraries
  • You have a strong knowledge of object-oriented design and development best practice in Java
  • You have worked with JSON based REST APIs before
  • You have experience with GIT and version control
  • You are enthusiastic about technology and eager to learn
  • You are at ease working on a unix-based system (you'll be using a Mac)
  • You have excellent command of the English language


Bonus points for:
  • You have developed an Android app and published it on Google Play
  • You have used RxJava, Retrofit or Kotlin in your previous projects or have some hands-on experience
  • You know how to apply at least one design pattern (preferably MVP or MVVM)
  • You can create a custom View
  • Experience with writing unit and functional tests
  • Experience implementing internationalization
  • You've written iOS or cross-platform apps before

  • Health Insurance - single
  • Life Insurance
  • Employee Assistance Program
  • 3 months full pay maternity & 2 weeks full pay paternity (if the statutory minimum is met)
  • 25 days of annual leave + Callsign Bank Holiday (not included in holiday allowance)
  • Free Financial Advise

  • Cycle to work scheme
  • Wills and Estates - our benefits provider has partnered with a third party who offers a discount
  • Home Utilities our benefits provider has partnered with a third party who offers a discount
  • Cycle Insurance
  • Health cash plans
  • Cyclist protection
  • Discounted gym membership
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