This paper presents the design, development and function of an application for reporting and eliminating failures on various technical systems such as air conditioners, central heating, plumbing systems, IT equipment, as well as keeping records of billing for services performed. The application contains the following:  Entry / Review / Correction of Customer Master Data  Entry / Review / Correction of Master Service Information  Entry / Review / Correction of defects at client's request  Assign a call to a specific service agent  Opening / Closing work orders for troubleshooting  Issuance of a fault repair service invoice The application is created for ASP.NET platform in VB.NET programming language with MS SQLServer database in the background. The web application can be distributed to the Cloud or to classic hosting. The application is primarily intended for small and medium-sized service companies engaged in the provision of repair services for various technical equipment.