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Frontend development patterns for React, Next.js, state management, performance optimization, and UI best practices.

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Backend architecture patterns, API design, database optimization, and server-side best practices for Node.js, Express, and Next.js API routes.

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Suggests manual context compaction at logical intervals to preserve context through task phases rather than arbitrary auto-compaction.

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Universal coding standards, best practices, and patterns for TypeScript, JavaScript, React, and Node.js development.

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ClickHouse database patterns, query optimization, analytics, and data engineering best practices for high-performance analytical workloads.

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Use this skill when adding authentication, handling user input, working with secrets, creating API endpoints, or implementing payment/sensitive features. Provides comprehensive security checklist and patterns.

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Automatically extract reusable patterns from Claude Code sessions and save them as learned skills for future use.

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Use this skill when writing new features, fixing bugs, or refactoring code. Enforces test-driven development with 80%+ coverage including unit, integration, and E2E tests.

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