The happy engineer concept is a much neglected one imo.

Rails devs who’ve mastered a lightweight js framework like Stimulus and perhaps a webhook utility like ActionCable are immensely more productive than a team of very separate front and back end devs.

Basecamp take this a level further whereby each dev is quite heavily involved in the design process, and their designers can also code in Rails.

With Hey I think they’ve shown that it can not only be lightning fast but pretty shiny!