What a strong Ruby on Rails specialist actually knows
Rails rewards developers who respect its conventions and know when to step outside them. A strong engineer writes small models, uses service objects sparingly, keeps queries honest with includes and database indexes, and treats background jobs through Sidekiq as part of the design, not an afterthought.
They are comfortable with Hotwire and Turbo for interactive pages without a heavy front end, with API-only Rails for mobile clients, and with RSpec test suites that run in minutes, not hours.