In this talk, I will present the NuttX RTOS, a POSIX and Linux-like RTOS for small microcontrollers, and show how you can use it to develop products faster than with existing alternatives. NuttX offers many advantages compared to other state-of-the-art RTOSes, primarily because it is POSIX compliant—meaning you can develop your application for Linux and then simply recompile it for NuttX. Additionally, NuttX includes many advanced features typically found only in more sophisticated operating systems like Linux or QNX, and it is already used by major companies like Sony, Samsung, Fitbit/Google, Xiaomi, and many others.