Database

ActiveRecord query patterns, associations, validations, callbacks, and performance optimization for Rails applications.

Building JSON APIs with Rails API mode, serialization, versioning, authentication, and rate limiting.

ActiveSupport::Concern patterns, module design, and code organization strategies for maintainable Rails applications.

Deploying Rails applications with Kamal, Docker, and production best practices for infrastructure and operations.

Hotwire and Turbo Drive, Frames, and Streams for building reactive Rails frontends without heavy JavaScript.

Background job processing with Sidekiq, including job design, error handling, queues, and performance tuning in Rails.

Stimulus.js controller patterns for adding interactive behavior to server-rendered Rails HTML.

Rails testing with RSpec and Minitest, covering model specs, request specs, system tests, factories, and test design.