The OMNITRACKER is a powerful, more than 20 years old system that was heavily used by massive clients like Deutsche Bahn or Bundesnetzagentur. On one hand, we had to simplify the Windows Client and need to consider older systems like Windows XP and older were this is still running on and at the same time transfering and improving features for the web clieant which also includes tabled and phone use. This was a massive challenge short to mid term. We started by building a user research group togehter with a mixture of our big, medium and small customers to understand user needs and find ways to interate on the Windows system and bring over everything more towads the web client. I had to have close daily alignments with the web and windows development teams to understand technical limitations and requirements.