Walk the interviewer through your process for learning a new system or software. If you have had to learn a new system in the past and were able to do so quickly, let the interviewer know.

"Whenever I need to learn a new program or software, I like to shadow someone using the program to see it 'live in action.' To learn your ATS in the most efficient way possible, I would like to sit with a team member and watch them navigate through the system for their day-to-day work. While that certainly wouldn't show me everything the ATS can do, it would give me a good idea of the key functionalities I would use most often. This is the method I employed at my current job when I first came on board. I spent two days sitting with a team member as she went through her daily tasks and by day three, I was ready to jump in on my own. There were certainly unique and infrequent tasks that came up where I needed additional training, but I was able to be an asset instead of a burden to the team within less than a week. I believe I would be able to get up to speed with your ATS just as quickly."