There are a lot of times when I am asked to complete a stack of technologies for building a Service Oriented Applications. And of course, like for everything, also for this topic there are a lot of answers (and opinions). Using this post I want to express my opinion based in my experience (through years in building medium-to-large applications for public and private sector), what are pieces to combine a SOA lego. So, here I am going to explain what are technologies that could be used to build a SOA application, of course Windows environment friendly. But, this post, is not attempting to give a complete tech stack for this type of apps.