A comprehensive reference guide for implementing authentication and authorization systems. Covers JWT tokens, OAuth2/social login, session management, role-based access control (RBAC), and security best practices with TypeScript/Express code examples.

A comprehensive guide to profiling and optimizing Python code. Covers CPU and memory profiling tools (cProfile, memory_profiler, py-spy), optimization patterns like list comprehensions, caching with lru_cache, NumPy vectorization, and parallel processing with multiprocessing and asyncio.

This skill provides comprehensive Python testing patterns using pytest. It covers unit testing, fixtures for setup/teardown, mocking external dependencies, parameterized tests, async testing, property-based testing with Hypothesis, database testing, and CI/CD integration. The guide includes best practices for test organization, naming, and coverage reporting.

This skill helps you set up and configure Prometheus for comprehensive metric collection and monitoring. It provides configuration templates for scrape jobs, recording rules, alert rules, and Kubernetes service discovery, along with validation commands and best practices for production deployments.

This skill provides comprehensive guidance for designing multi-cloud architectures. It includes service comparison tables across AWS, Azure, and GCP, migration strategies, cost optimization tips, and cloud-agnostic design patterns for building vendor-neutral applications.

A comprehensive guide to mastering advanced Git techniques including interactive rebasing, cherry-picking commits across branches, using git bisect to find bugs, managing multiple worktrees for parallel development, and recovering from mistakes with reflog. Helps developers maintain clean commit history and collaborate effectively.

This skill provides a comprehensive framework for implementing Service Level Indicators (SLIs), Service Level Objectives (SLOs), and error budgets. It includes Prometheus recording rules, Grafana dashboard configurations, and alerting strategies to help SRE teams measure and maintain service reliability.

This skill provides comprehensive PostgreSQL database design guidance covering data types, indexing strategies, constraints, partitioning, and schema design patterns. It includes detailed recommendations for handling JSONB, time-series data, update-heavy tables, and safe schema evolution practices.

A comprehensive guide for creating production-ready Kubernetes manifests. Provides step-by-step workflows, YAML templates for Deployments, Services, ConfigMaps, Secrets, and PersistentVolumeClaims, along with security best practices and troubleshooting guidance.

This skill provides comprehensive guidance for implementing PCI DSS (Payment Card Industry Data Security Standard) compliance. It covers the 12 core requirements, tokenization strategies using payment processors like Stripe, encryption for data at rest and in transit, access control patterns, and audit logging best practices for secure payment processing.

This skill helps you create production-ready Grafana dashboards for monitoring applications and infrastructure. It provides design patterns like RED and USE methods, JSON templates for common dashboard types (API, database, infrastructure), and provisioning examples using Terraform and Ansible.

This skill provides comprehensive guidance for building sophisticated LLM applications using LangChain 1.x and LangGraph. It covers agent orchestration with StateGraph, RAG implementations, multi-agent systems, memory management patterns, and production deployment best practices including LangSmith observability integration.

A comprehensive guide for implementing automated billing systems including SaaS subscription management, recurring payments, invoice generation, and failed payment recovery (dunning). Provides Python code examples for integration with payment processors like Stripe.

A comprehensive reference skill for building production-ready Node.js backend applications. It provides architectural patterns, code templates, and best practices for Express.js and Fastify frameworks, covering authentication, database integration, middleware, error handling, and caching strategies.

A comprehensive reference guide for modern JavaScript (ES6+) features and patterns. Covers arrow functions, destructuring, async/await, Promises, functional programming, classes, modules, iterators, generators, and performance optimization techniques for writing clean, maintainable code.

A comprehensive reference guide for Python asynchronous programming. Covers asyncio fundamentals, coroutines, tasks, async context managers, producer-consumer patterns, rate limiting with semaphores, and real-world examples including web scraping with aiohttp, async database operations, and WebSocket servers.

This skill guides the setup and configuration of Static Application Security Testing (SAST) tools including Semgrep, SonarQube, and CodeQL. It helps developers integrate security scanning into CI/CD pipelines, create custom security rules, and establish quality gates for vulnerability detection across multiple programming languages.

This skill helps manage major dependency version upgrades in JavaScript/TypeScript projects. It provides strategies for compatibility analysis, staged upgrade workflows, codemod automation, and comprehensive testing approaches including rollback plans and automated update configuration with Renovate or Dependabot.

This skill helps developers test Solidity smart contracts using Hardhat and Foundry frameworks. It covers unit testing, integration testing, mainnet forking for realistic testing scenarios, gas optimization analysis, fuzzing for edge cases, and CI/CD pipeline integration for automated testing workflows.

A comprehensive guide to proven backend architecture patterns. Teaches Clean Architecture (Uncle Bob's layers), Hexagonal Architecture (Ports and Adapters), and Domain-Driven Design (DDD) tactical patterns with Python code examples for building maintainable, testable, and scalable systems.

A comprehensive reference guide for the uv package manager, an extremely fast Python package installer written in Rust. Covers project setup, dependency management, virtual environments, Python version management, CI/CD integration, Docker workflows, and migration from pip/poetry/pip-tools.

This skill provides comprehensive guidance for executing database migrations across popular ORMs including Sequelize, TypeORM, and Prisma. It covers schema transformations, data migrations, rollback procedures, and zero-downtime deployment strategies with practical code examples.

This skill teaches comprehensive evaluation strategies for LLM applications, covering automated metrics (BLEU, ROUGE, BERTScore), human evaluation frameworks, LLM-as-Judge patterns using Claude, A/B testing with statistical analysis, and regression detection. It includes ready-to-use Python code examples and integrates with tools like LangSmith.

This skill helps developers master monorepo management using Turborepo, Nx, and pnpm workspaces. It provides configuration patterns, dependency management strategies, code sharing approaches, build optimization techniques, and CI/CD setup guidance for multi-package repositories.

This skill provides production-ready FastAPI project templates with comprehensive patterns for async database operations, CRUD repositories, service layers, JWT authentication, and testing. It guides developers in setting up well-structured Python API projects using modern async patterns and best practices.

Provides production-ready GitHub Actions workflow templates for common CI/CD tasks including automated testing, Docker image building, Kubernetes deployments, matrix builds, and security scanning. Templates follow best practices with pinned action versions, caching, and reusable workflows.

This skill provides comprehensive documentation and code examples for building RAG (Retrieval-Augmented Generation) systems. It covers vector database setup (Pinecone, Weaviate, Chroma, pgvector), embedding strategies, retrieval patterns (hybrid search, HyDE, multi-query), chunking strategies, and evaluation metrics using LangChain and LangGraph.

This skill helps developers modernize React applications by providing comprehensive guidance on upgrading from React 16 to 18, migrating class components to functional components with hooks, and adopting concurrent features like Suspense and Transitions. It includes code examples, codemod commands, and migration checklists.

A comprehensive guide for optimizing cloud costs across AWS, Azure, and GCP. Covers reserved instances, spot instances, savings plans, tagging strategies, auto-scaling patterns, and storage lifecycle policies with Terraform/HCL examples.

A comprehensive guide for implementing Kubernetes security policies including NetworkPolicy for network segmentation, RBAC for access control, Pod Security Standards for container hardening, and OPA Gatekeeper for policy enforcement. Provides ready-to-use YAML templates and best practices for production-grade cluster security.