Design, build, and maintain services and features using Ruby on Rails. Architect scalable systems that handle large datasets and high request volumes. Extend and evolve our custom design system (Hotwire + Tailwind) to support new components, patterns, and accessibility standards. Build, maintain, and integrate user-facing features with Hotwire, Stimulus, and Turbo, with occasional use of modern JavaScript frameworks when appropriate. Collaborate with the Engineering Manager and product team to define priorities and roadmap. Identify and resolve performance bottlenecks across database, application, and frontend rendering. Implement background job processing (Sidekiq, Redis). Write automated tests (RSpec, system tests, Stimulus/Hotwire test helpers). Participate in code reviews, documentation, and planning sessions. Balance technical excellence with timely delivery.