I helped conceive, and managed, a product that handled $1B revenue per month at a single customer site (and was installed at many more). You don't see me going around and bragging about it (oh wait...)

Funny enough, the significance went completely over my head at the time. We were too focused on making sure it worked and not losing any deposits. It wasn't until a year later when I ran some stats for a product review / presentation that it sank in.