概要
https://speakerdeck.com/cnosuke/fintechtorailstogrpcto?slide=1
https://github.com/cnosuke/bank_sample
http://kotaroito.hatenablog.com/entry/2017/10/25/095333
https://github.com/square/rough
https://magazine.rubyist.net/articles/0056/0056-hanami.html
https://github.com/treasure-data/serverengine
https://8thlight.com/blog/uncle-bob/2012/08/13/the-clean-architecture.html
http://engineer.crowdworks.jp/entry/2018/03/26/140018
https://github.com/bigcommerce/gruf
https://employment.en-japan.com/engineerhub/entry/2017/04/07/110000