How much you can learn, and how fast you can learn when debugging. Now, whenever I start with a new company, I make it known during the interview process that

How much you can learn, and how fast you can learn when debugging. Now, whenever I start with a new company, I make it known during the interview process that I expect to spend at least the first 2-3 weeks (preferably more) doing nothing but fixing bugs. That's the best way I've found to get a solid understanding of the codebase.