In a world of fast-growing cities and the need for easier, eco-friendly travel, Mobility as a Service (MaaS) is a promising solution. MaaS combines different types of transportation like buses, taxis, and bikes into one easy platform for planning and payment. At the current state, MaaS implementations face several problems like fragmented territorial systems and privacy concerns between Mobility Service Providers. In this thesis, I propose the design and implementation of a possible MaaS infrastructure that tries to solve those problems with the use of blockchain and smart contracts. I created a standard for representing tickets and I was able to code smart contracts to handle this standard and to allow buying and validating tickets.