Vector was hired because the customer knew that he needs external hands-on expertise with system-, hardware- and software development to be useful. We developed appropriate methods for system analysis, system design, architecture modeling, interface consistency, and component implementation. Special attention was given to component interfaces and industry standards adherence, because of the application to safety-critical domains. After a pilot phase, where the techniques were evaluated and optimized for different project types, a suitable modelling tool was introduced. We evaluated the architecture to improve interfaces and ease an efficient documentation and traceability for future changes and enhancements. Then we coached developers and team leaders to use the tool and methodology as quickly as possible.