Comment by The_Fox

Agreed- just a month ago I told my team to read https://www.joelonsoftware.com/2006/06/16/my-first-billg-rev... and note how Spolsky knew the details of his application (weird date issues in Excel and VB). If you want to be a senior engineer, you need to know where are the odd edge cases in your app. I don't want to be the only one on the team who remembers that stuff.