Sometimes the worst problem I have faced in my job is not knowing the solution or the answer. Not all engineers know every aspect of their jobs. I have encountered problems where I have been unsure of what to do and how to help. Fortunately, I have a great team of work colleagues who have helped me and we have worked on a problem together to create a solution.
The worst problems I’ve had are usually not to do with engineering, but more to do with administration and the way organisations run. Things like that can be very frustrating and demoralising, and sometimes means it’s time to move on to somewhere else.