In January, 2006 was started development of Latvian State E-government E-service Infrastructure Development Project (the customer and provider of the system is the Secretariat of Special Assignments Minister for Electronic Government Affairs (SSAMEGA)) – Integrated State Information System (ISIS, Latvian abbreviation IVIS). The infrastructure is already accessible for E-service designers and developers since the middle of 2007. The first E-service (available on Latvian government E-service portal – www.latvija.lv), which is integrating four significance state registers, is released February 1, 2008. ISIS is based on Service Oriented Architecture (SOA) principles and includes many individual innovations and modern solutions, which gives opportunities for the process of developing integrated E-services at the State level standardization and automation. The paper describes development architecture and innovations for solving e-government problems.