Welcome to F136 - the gematik technology blog

The gematik technology blog was created to give back to the community. As open source is part of our DNA, we do not only share our work results on GitHub but also want to share the stories behind them. We hope it helps people to prevent making mistakes we made and motivates them to explore technologies for modern healthcare!

The name “F136” is not a new stealth fighter airplane but derives from our location in the heart of Berlin, at Friedrichstrasse 136. It’s a commonly used internal term for our office.

Have fun reading at the gematik tech blog!

Our blog articles

testing

• Zero-line test suite - 13 Oct 2022

  Writing test suites that don’t age, don’t require software developers to set up, and still have significant technical depth is an impossible goal we at Gematik are constantly working towards. Zero-line test suites are a concept for minimizing required code while maximizing technical depth.

tech

• How to replace the builder pattern in Kotlin - 11 Jan 2023
  Java has Lombok with its @Builder annotation. How to replicate this functionality when moving the codebase to Kotlin
  
  
• How we established a Secure Software Development Lifecycle - 09 Dec 2022
  Building secure software is hard. In this post, we share our experience with establishing a Secure Software Development Lifecycle during the development of the E-Prescription app.
  
  
• Software Factory - 14 Nov 2022

  Since May 2022 and after a long preparation, we’ve officially opened at gematik the Software Factory to all our colleagues. It is a collection of services that help developers, test analysts, and software architects to build, test, and release their projects in a stable, trackable, and consistent way.

• Validating FHIR resources is easy, right? Right?? - 04 Nov 2022
  It's pretty easy to build a reference validator for a given FHIR specification. And we'll show you how to do it.
  
  
• VAU and the Brainpool; plus some Kotlin - a more lightweight approach to ECIES - 12 Oct 2022

  Probably you’re here for an answer on how to implement the Elliptic Curve Integrated Encryption Scheme (ECIES) in something like Kotlin or Java for communicating with the trusted execution environment (TEE; or in german, we like to call this VAU) of our e-prescription server. Perfect! Because otherwise, I would lose your attention to three lines of code:

• Localization of the NFC antenna on Android devices - 07 Oct 2022
  In order to fully use the *E-Rezept-App* the users have to authenticate themselves with their digital identity which is stored on their health card (eGK). NFC-Localization-Android is an open source project which was implemented by the author to gather position data of the NFC-antennas of various Android based mobile phones. The goal is to provide users with better guidance during the authentication process by displaying the correct positioning of the health card relative to the mobile phone and its NFC antenna.
  
  
• OpenHealthCardKit - 23 Sep 2022

  The digitalization of the German Health System is progressing. One essential part for the users is having a digital identity on a health card that authenticates oneself. OpenHealthCardKit is the link to provide access to this card via a mobile device. It abstracts the technical communication and provides a semantic interface for your use case. With OpenHealthCardKit, accessing a card’s data and applications in your health-related app is now easy.

culture

• We open a new chapter - 30 Sep 2022
  We recently switched the organizational structure of the software development department from a line reporting focus to a learning focus. This is how we did it and what we learned.
  
  
• Welcome to the show! - 15 Sep 2022

  Welcome to the tech blog of the gematik! We know that starting a blog in 2022 is by no means innovative. But sharing knowledge is part of our DNA! We do it internally with our fellow developers, testers, and product owners - and we do it externally by sharing code and specifications on GitHub.