You're telling me you maintain the ability to pass the various interviews that the modern FAANG SWE gauntlet requires year-round? Good for you if so, but this doesn't match the experience of any of the folks that I've worked with across my career.
Who said anything about FAANG? I don't work in that world and in fact you literally could not pay me to do so. It seems miserable as hell. But Dropbox isn't in that world either. And in any case, I've never ever had to prepare for a job interview at all, let alone for multiple months. They aren't that hard in most cases.