Explore the journey of developing an open-source mechanical ventilator in this 41-minute conference talk by Luis Herrera Izquierdo from ThoughtWorks. Delve into the project's evolution, from identifying the problem to implementing an evolutionary architecture. Discover the tech stack employed and learn about the importance of incremental changes and testability in the development process. Gain insights into the challenges faced and how continuous integration was implemented, including the use of platform agents and Pylon. Examine the key factors that contributed to the project's success and understand how these lessons can be applied to other IoT projects. This talk provides valuable insights for developers and engineers interested in open hardware and open-source software development for critical medical devices.