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databases

• PostgreSQL

background job libraries

• Active Job

testing tools

• RSpec

frontend frameworks

• Hotwire Turbo

deployment tools

• Kamal

js bundlers

• esbuild

js transpilers

• Vanilla JavaScript

css frameworks

• Tailwind CSS

asset pipelines

• Propshaft

template engines

• ERB

cache store implementations

• Redis

realtime frameworks

• Action Cable

ruby implementations

• MRI Ruby (CRuby)