Great write up, thanks!<p>I hadn't heard of Terraform before, so thanks for the introduction. I have recently been attempting to familiarize myself better with systems infrastructure, and it looks interesting. I'll have to do some reading on it.<p>I have a question. You mentioned that Whimsical's back-end, "mostly serves as a lightweight layer between the client and the data store." Does this mean that you do most of the data munging client side so that once it arrives server side, most of the work is already done? And if so, what do the trade-offs look like in such a scenario? If I'm understanding correctly, this means the client is fatter, but there's less load on the server, meaning cheaper infrastructure costs. Is this a correct way of looking at it?<p>I'm just a junior dev trying to gain a better understanding of large systems, so forgive me for any ignorance or misunderstanding.
I would be very interested to learn how you manage changefeeds, e.g. distributing updates to client apps. I used RethinkDB for this, as every other solution seemed like lots of extra work.