Testing patterns for Jest and Playwright. Use when writing tests, setting up test fixtures, or validating RLS enforcement. Routes to existing test conventions and provides evidence templates.

Design microservices architectures with service boundaries, event-driven communication, and resilience patterns. Use when building distributed systems, decomposing monoliths, or implementing microservices.

Master Node.js streams for memory-efficient processing of large datasets, real-time data handling, and building data pipelines

Test smart contracts comprehensively using Hardhat and Foundry with unit tests, integration tests, and mainnet forking. Use when testing Solidity contracts, setting up blockchain test suites, or...

Test smart contracts comprehensively using Hardhat and Foundry with unit tests, integration tests, and mainnet forking. Use when testing Solidity contracts, setting up blockchain test suites, or...

Test smart contracts comprehensively using Hardhat and Foundry with unit tests, integration tests, and mainnet forking. Use when testing Solidity contracts, setting up blockchain test suites, or...

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Design microservices architectures with service boundaries, event-driven communication, and resilience patterns. Use when building distributed systems, decomposing monoliths, or implementing microservices.

End-to-End Testing Framework skill - Browser automation, API testing, performance benchmarking, test report generation, and chaos engineering basics. Use for comprehensive application testing.

Node.js backend patterns with Express/Fastify, repositories

Implement event sourcing and CQRS patterns using event stores, aggregates, and projections. Use when building audit trails, temporal queries, or systems requiring full history.

Express/Hono with Supabase and Drizzle ORM

Implement comprehensive alert management with PagerDuty, escalation policies, and incident coordination. Use when setting up alerting systems, managing on-call schedules, or coordinating incident response.

Handle errors gracefully with custom error types, status codes, and error pages. Use for building robust APIs with proper error responses.

Expert guidance on Swift Testing best practices, patterns, and implementation. Use when developers mention: (1) Swift Testing, @Test, #expect, #require, or @Suite, (2) "use Swift Testing" or...

React Router performance and architecture patterns. Use when writing loaders, actions, forms, routes, or working with React Router data fetching. Triggers on tasks involving React Router routes,...

Implement rate limiting to protect APIs from abuse. Use for preventing DDoS attacks and ensuring fair resource usage.

Configure TLS/HTTPS with automatic certificate management via ACME (Let's Encrypt). Use for production deployments with secure connections.

Implement session management for user state persistence. Use for login systems, shopping carts, and user preferences.

Implement request logging, tracing, and observability. Use for debugging, monitoring, and production observability.