Great post, I've used all these services once or more at various points in my career. I'm still on the Digital Ocean stage, as I've found AWS is often overly complicated (or at least too much for me as a primarily solo founder) I'm curious about this line:

> We were doubling the size of our customer base every 9 months, and pretty soon this meant we needed more servers.

I've found that a moderately sized 4 core 'droplet' from Digital Ocean handles nearly anything I can throw at it (at least in terms of the web application world) - I see you product is doing employee management / scheduling - is there heavy compute / resources associated? Or is it more due to privacy requirements (i.e. you need a siloed instance / server per client?). Not trying to sound smug at all, just genuinely curious where the load comes from.