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Gap­fish GmbH - Soft­ware­ent­wick­lung

GapFish – solution provider for digital market research and the largest ISO certified online access panel in the German-speaking world. GapFish is an ISO 20252 certified, online access panel provider, with more than 40 employees and over 300 customers. Founded in Berlin in 2012, GapFish has more than 500,000 panelists with deep profiling in Germany, Austria and Switzerland. Cooperations with, among others, Mediengruppe RTL Deutschland, Spiegel Group, REWE Group, Gemius, RMS, or the Austrian Gallup Institute in combination with the latest technologies such as Pixel tracking, GPS tracking, or Behavioral metering also enable GapFish to map special target groups and implement sophisticated study designs in the context of market, social, and advertising impact research – online or mobile.

Full Stack / Backend Developer

Work­ing field:

  • You develop distributed backend systems in Ruby (Rails, Sinatra)
  • You take over tasks in the programming of interfaces (REST-APIs)
  • You are responsible for the development of modern user interfaces in the browser, on Android and iOS
  • You analyze and improve the performance of our software and infrastructure components.
  • You actively participate in relevant open source projects
  • You identify problems independently and find suitable solutions
  • You are actively involved in the development of new ideas and support the conception of new products from the very beginning.
  • You act as mentor for younger team members.


  • You have experience in developing distributed web applications, ideally with Ruby and Javascript
  • You are not afraid of intensive teamwork, constructive criticism and are willing to pass on your knowledge and skills.
  • Software development is a craft for you, you want to become a master and are ready to continuously work on your own skills, which is necessary for it (“deliberate practice”).
  • You are interested in trying out new technologies and are interested in driving innovation from a technological point of view.

What we of­fer:

  • Diverse work with current technologies (Docker, MongoDB, Kubernetes) and a distinctive culture with regular code reviews, pair programming and test driven development.
  • We are a small team with flat hierarchies and offer further development opportunities tailored to your interests.
  • We have a high moral standard – we respect data protection principles and work under the rules for market and opinion research.
  • Our beautiful office is centrally located on Kurfürstendamm and has good public transport connections.
  • We value good cooperation and a positive working environment – this also includes playing the Rocket League or Mario Kart after lunch, the offer of regular massages or meditation courses.