STSI - Integrated technical services Ltd. is a leading company for maintenance, engineering and performance of investment projects in Croatia, resulting from technology and resources integration. United individual services, together with highly educated and trained staff and newest technology, successfully meet all customers' needs. Throughout its longtime history, as well as today, STSI aims at research and the production of oil and gas, processing, sale and distribution of oil, gas and petroleum products. In different organization forms, STSI includes domains of mechanical engineering, electrical engineering, civil engineering and transport.