The study of Design Patterns are helping software engineers to overcome repetitive problems encounter while producing particular application or outlining specific architecture. Agents and its consistent research on multi-agent systems are increasingly playing an important role in the development of mobile applications. The implementations we focus on are related to the use of agent techniques to provide holders of pocket devices with social and location-based services. In this paper, we highlight the importance of applying design patterns concepts and theories in the development of advanced mobile service applications. We further relate our ideas to the deployment of localized rideshare system that relies on the cellular phones of interested students to facilitate their daily commutes.