Especially in the financial industry we are often facing the challenge to integrate new features and new technology into the existing legacy environment. We have to focus on the legacy systems instead of focusing on the new potential. This takes time, increases costs and decelerates development. In general disregarding maintenance and modernization of software, processes and data structures lead to a degeneration and a lack of adaptability. Hans Hosea Schäfer will figure his approaches and ideas to achieve software regeneration and system improvement. Modernizing working business critical systems often takes some time, but harvesting the benefits is great: in consequence you can focus on future improvement instead of legacy from the past - at least concerning your system.