This question is more specific to firmware engineers who work on Tesla's internal computers rather than those working the vehicle systems. This is because the kernel is a central processing unit or CPU component that interacts with the firmware when the device is powered on. It loads the code needed for the computer to complete the start-up and then function. If you work with computers and design firmware for them, then you have experience with kernels. Even if you haven't, you probably learned about them during your education and training. As with any question asking about a piece of technology, keep your answer brief and to the point and expect a follow-up question from the Tesla interviewer.