The most process-oriented implementation and division of tasks possible is based on an agile process model. The provision of functions for several technical environments (e.g. Unix, Windows, mainframe, cloud) requires a platform-neutral coding. The test tool for the access layer has rich functions for testing through concept creation. It allows developers to test the access layer on different platforms. The development is also supported by a high-performance test driver, which allows regression tests with a large number of test cases in a short time. The functionalities for serialization and deserialization of the test case format are extended and also used when addressing the access layer via services. Quality assurance is significantly supported by regression tests with a high degree of coverage and permanent monitoring of memory management.