The paper focuses on development and application of a software engineering system BPsim. SD, part of decision support suite BPsim. DSS, which greatly simplifies analysts work and their interaction with software developers. System is integrated into a decision support suite, which allows instant transition from software entities design to simulation of developed product with possible application of simulation experiment design for tough projects. Paper gives several examples of the system deployment in production environments, both for model validation (which was successful) and for software design from scratch, which resulted in benefits from decreased costs and avoided data losses. After verification the system has been used in multiple projects. This paper describes software application for design of an information system for shareholders registers, located in Russia.