Enterprise Architecture includes IT infrastructures, business processes and whole computer applications in an enterprise. Since such enterprise architecture is the backbone of corporates operating model and business processes, enterprise architecture conversions are very strategic projects. The general tendency for enterprise architecture conversion is big bang approach that is hard to be supported by executives as the results are very late for new architecture toprove. Because of complexity and trade-off between costs and risk, this paper suggests simple solution that starts the project with small core team. First task will be developing coexistence methodology between two systems in data level. By this solution the whole system is able to redesign smaller business projects step by step. It continues developing a prototype on simple business scenario that contains most common behavior of all enterprise architecture. The prototype's aim is to prove new design. The key success factor of this model is agility while managing divided projects and good management skill of the core team while developing new core business processes and system architecture.

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Applications which are the result of Software Development Life Cycle (SDLC) should be delivered to end users seamlessly. This delivery process which is named as deployment is therefore critical. Especially for systems with ongoing development and frequent deployments, this process should not take a lot of time and create a state of emergency. Also it is important that it is automatized and does not disrupt business continuity. Criticality of transactions increases the importance of deployment process for financial enterprises which are also required to have high performance systems and give uninterrupted service. In this study, deployment of critical financial systems with Service Oriented Architecture (SOA) is addressed and requirements of deployment process are described. Alternative deployment processes for SOA are discussed and compared, "Running from Client via Branch Server" model is proposed with its application architecture and principles of operation. It is shown that this model is the optimum deployment model in terms of performance and availability. The model is detailed in accordance with requirements of financial systems.