Methods, systems, and apparatus, including computer program products, for implementing a software architecture design for a software application implementing service procurement. The application is structured as multiple process components interacting with each other through service interfaces, and multiple service interface operations, each being implemented for a respective process component. The process components include a Project Processing process component; a Purchase Request Processing process component; a Purchase Order Processing process component; a Purchasing Contract process component; a Goods and Service Acknowledgement process component; a Supplier Invoice Processing process component; an RFQ Processing process component that; and a Time and Labor Management process component.