Service Oriented Architecture (SOA) promotes services as basic building elements for rapid development of distributed applications and integration of heterogeneous systems. Serviceoriented programming model (SOPM) is well-suited for end-user development of serviceoriented applications. Service-oriented applications developed using SOPM consist of application services, distributed programs, and coopetition mechanisms. Distributed programs utilize application services and define overall application's coordination logic by using functionalities of coopetition services. The master thesis describes an end-user service composition language named Simple Service Composition Language (SSCL) that enables development of distributed programs. SSCL language is well-suited for end-users that are not familiar with programming languages and have little experience with programming techniques. SSCL language is based on principles of script languages and its only purpose is description of service composition logic. As SSCL language is a domain specific language with small statement set, its syntax and semantic rules are simple. Simplicity of the language improves the language learning process and adapts it to end-users. As a part of the master thesis, the expressiveness of the SSCL language was analyzed by implementing a set of workflow patterns. The results of the analysis show that the SSCL language is highly expressive regardless of its simplicity. Distributed programs written in SSCL language are translated to interpretable language by distributed translation system. Distributed translation system is designed according to SOA principles and is implemented using standard Web Services technologies. Service oriented implementation enables execution of translation system in heterogeneous environments such as Internet.