Deep reference for React Native / Expo patterns -- Expo Router v7, screen structure, TanStack Query with offline persistence, native modules, NativeWind styling, forms, accessibility, Reanimated animations, performance, deep linking, Sentry wiring, EAS Build/Submit/Update, testing, and platform gotchas. Grounded in Expo SDK 55+ and React Native 0.83+ with the New Architecture.
Deep reference for PostgreSQL schema design, query optimization, indexing, migration safety, and data modeling. Focused on patterns that prevent costly refactors.
Deep reference for React/TypeScript patterns -- React 19 hooks, Vike SSR, component composition, type safety, testing with Vitest/RTL, accessibility, data fetching with TanStack Query, CodeMirror integration, and performance. Grounded in patterns from a production Vike + React 19 app.
Deep reference for Ruby on Rails 8 patterns -- Hotwire/Turbo 8 morphing, Sidekiq + Solid Queue, service objects, minitest + fixtures, ActiveRecord, security, deployment with Kamal. Focused on Rails 8-specific and non-obvious patterns.
Deep reference for Python/FastAPI patterns -- async SQLAlchemy, Pydantic v2, service layer, dependency injection, error handling, testing, background jobs. Covers non-obvious gotchas and production patterns.