Many companies with huge application portfolio are facing the problem of inflexible IT and high expensesspent on application development. They are planning to adopt service oriented architecture which in integration area usually leads to implementation of enterprise service bus or similar product.

There are many pitfalls that can happen and not every way leads to successfull implementation and does not reach the expectations. Author of the article focuses on integration based on ESB product as this approach becomes the most used one at present time. The author also draws upon his experience with applicaiton integration in several banks in Central and Eastern Europe. The article describes the ESB product implementation from the first thought to deploymentto production environment.