Energy is becoming a central issue in the 21st century. The Crowd Energy project has earned the label “first of its kind” – not only because of its goal to save energy, but also because of the way in which the project has been delivered – quickly, efficiently and cheaply. Crowd Energy focuses on energy conservation for electric vehicles and at the same time represents the first peer-to-peer electricity marketplace designed for a modern and sustainable world. This project shows that modern technology and sustainable development are not incompatible concepts, but can work together successfully to bring new possibilities for the future. We created a web and mobile app for Crowd Energy that allows users to buy and sell electricity easily and intuitively. Within as little as 5 weeks, we were able to create and deliver the final project – including a number of design changes. To reduce costs, we took a PWA approach that allowed us to create both a web and mobile app at the same time. The app is integrated with Amazon AWS.