I was interviewed by the operations manager and a project manager. They tested me on basic circuits such as ohms law and resistors in parallel vs series. They tested my understanding of the basics of micro controllers such as what is an analog input or output and what is a digital input and output. They also tested me on a basic understanding of programming such as if then else type of stuff. Finally they provided a control diagram of an HVAC system and asked me to describe what was going on.