Shortcuts around the mistakes I've made building a realtime ad analytics platform

Tracking every ad impression on millions of page views per day and reporting on them in real time, how hard can it be? Give us a month or two, I said.

Now, more than a year later I can look back at all the mistakes we made, and how they taught us the basics of building stuff that works, and keeps working as you add more and more zeroes.

Btw. everything they told you about databases at university is wrong.