A method and system are provided for transforming legacy application(s) into target (modern) application source(s) to execute on modern technology and hardware. In one implementation, such a system identifies elements of legacy applications, generates an element tree to generate a source code functionally equivalent to that of the legacy application, but superior and modern in technology, deployable onto a distributed architecture on a hardware server cluster. The generated source code is assessed to detect and correct code defects, and test cases are generated for identifying the potential errors of the target application under development.