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Client-side React performance optimization patterns.

Connect Query patterns for API calls. Use when working with mutations, queries, or data fetching.

TypeScript, React, and JavaScript best practices enforced by Ultracite/Biome.

Write and run Playwright E2E tests for Redpanda Console using testcontainers. Analyzes test failures, adds missing testids, and improves test stability. Use when user requests E2E tests, Playwright tests, integration tests, test failures, missing testids, or mentions 'test workflow', 'browser testing', 'end-to-end', or 'testcontainers'.

Refactor legacy forms to use modern Redpanda UI Registry Field components with react-hook-form and Zod validation. Use when user requests: (1) Form refactoring or modernization, (2) Converting Chakra UI or @redpanda-data/ui forms, (3) Updating forms to use Field components, (4) Migrating from legacy form patterns, (5) Implementing forms with react-hook-form and Zod validation.

Manage client and server state with Zustand stores and React Query patterns.

Build UI with Redpanda Registry components, Tailwind v4, and accessibility best practices.

Write and maintain tests with Vitest v4 dual configuration, mock utilities, and Zustand store testing patterns.

Resolve npm dependency vulnerabilities detected by security scans.

Migrate React applications from React Router to TanStack Router with file-based routing. Use when user requests: (1) Router migration, (2) TanStack Router setup, (3) File-based routing implementation, (4) React Router replacement, (5) Type-safe routing, or mentions 'migrate router', 'tanstack router', 'file-based routes'.