Go Concurrency Patterns

Go language patterns for 2026 — concurrency with errgroup, error wrapping, HTTP servers, gRPC, database access, testing, and CLI with Cobra

Write reliable Go code avoiding goroutine leaks, interface traps, and common concurrency bugs.

Expertise in Go project architecture, error handling, concurrency safety, testing, observability, configuration, CI/CD, and documentation for production depl...

WHAT: Production-ready Node.js backend patterns - Express/Fastify setup, layered architecture, middleware, error handling, validation, database integration, authentication, and caching. WHEN: User is building REST APIs, setting up Node.js servers, implementing authentication, integrating databases, adding validation/caching, or structuring backend applications. KEYWORDS: nodejs, node, express, fastify, typescript, api, rest, middleware, authentication, jwt, validation, zod, postgres, mongod

Write and run tests across languages and frameworks. Use when setting up test suites, writing unit/integration/E2E tests, measuring coverage, mocking dependencies, or debugging test failures. Covers Node.js (Jest/Vitest), Python (pytest), Go, Rust, and Bash.

Systematic task implementation using TDD, phase checkpoints, and structured commits. Ensures quality through red-green-refactor cycles, 80% coverage gates, and verification protocols before proceeding.