As a small team, we wanted to pick the framework which allowed us to move quickly. There's no option better than Rails. Not having to solve the fundamentals means we can more quickly build our feature set. No other framework can beat ActiveRecord in terms of integration & ease-of use. To top it all of, there's a lot of attention paid to security in the framework, making almost everything safe-by-default.
While building our authentication system, we originally picked Mailgun. However, emails took minutes to arrive and some of them didn't get delivered - or got delivered to spam.
We started looking for a new provider, and settled on Postmark. We love that they track time-to-inbox, it makes me feel they really care about going above and beyond to provide a good service.
We choose Backblaze B2 because it makes more sense for storing static assets.
We admire Backblaze's customer service & transparency, plus, we trust them to maintain fair business practices - including not raising prices in the future.
Lower storage costs means we can keep more data for longer, and lower bandwidth means cache misses don't cost a ton.