Rails, Sidekiq, Postgres, Redis. A little bit of Go. I chose Rails because it gives me a high development velocity, and because I love Ruby. I chose Go for a fe

Rails, Sidekiq, Postgres, Redis. A little bit of Go. I chose Rails because it gives me a high development velocity, and because I love Ruby. I chose Go for a few things, such as the CLI, for its portability. I do think my choices have had an impact on my success, but only for its effect on velocity. My customers don't tell me how glad they are that I wrote my API in Ruby. But I'm able to build and release new features much faster than my competition. And fix bugs faster. And they do notice that. I follow conventions, so things usually just flow. Some features I've built recently would have also been much harder to build in a language without strong metaprogramming.