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Stack-agnostic staff-level engineering practices for architecture, concurrency, reliability, error handling, testing, CI/CD, and code craft. Apply when designing, building, reviewing, or refactoring any non-trivial software, in any language — whenever design choices, failure modes, or scale matter (not one-line edits). Pairs with the stack-specific skills (go-practices, react-practices, python-practices) for idioms; this skill holds the principles those specialize.

Modern React + TypeScript idioms (React 19 era) — Server vs Client Components, Server Actions, data fetching, the React Compiler, reusability, performance, and frontend security. Apply when writing, reviewing, or refactoring React UI — .tsx/.jsx components, hooks, data fetching, or client state. Complements engineering-principles (stack-agnostic rules); this is the React/TS-specific layer.