The process with Megger can be a bit daunting at first if you aren't use to the culture in this industry(Test Set OEMs). You will go through a few phone call interviews where you will usually speak with the hiring manager and maybe one or two of your potential future colleagues, where you will asked all sort of questions ranging from your past experience, knowledge of the power system testing industry, experience commissioning substations, transformers, etc.
If you pass this portion you will be invited to an all day panel in one of their offices like Dallas. Here you will usually be meet by their lovely staff where you will get a factory tour and eventually sat down in a conference room where you will get a long agenda of the meetings you will be having through out the day. They will take you to lunch, and then continue the panel of interview throughout the day. It can be very intense if you have never done this kind of interview process before but, ultimately it will feel rewarding having made it through the process. You will be asked technical question to test how deep your knowledge goes, but also soft skills questions about dealing with customer and business to business relationships. Overall if you been in the industry even for a short amount of time there will be some name recognition here and there that you pick up on. If you love this segment of the energy industry you will see many interview processes that are very similar from other companies.