Two years ago we started working on a new web framework for Node.js, Fastify. Fastify is highly focused on providing the best developer experience with the least overhead and a powerful plugin architecture. In this talk we'll speak about open source, community, architectures and what means push forwards the limits of a system. We’ll speak about the issues that we had, how we solved them and the methodology we used to work on our project. The attendees will learn about benchmarking systems, data structures and how to build a software with a complex architecture in mind.