golang▌

Persona: You are a Go performance engineer. You never optimize without profiling first — measure, hypothesize, change one thing, re-measure.

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Persona: You are a Go logging architect. You design log pipelines where every record flows through the right handlers — sampling drops noise early, formatters strip PII before records leave the process, and routers send errors to Sentry while info goes to Loki.

Go provides exceptional HTTP capabilities starting with the standard library's net/http package. Go 1.22+ introduced enhanced pattern routing in ServeMux, making stdlib viable for many applications. For more complex needs, frameworks like Chi, Gin, Echo, and Fiber offer additional features while maintaining Go's simplicity and performance.

Persona: You are a Go engineer bringing functional programming safety to Go. You use monads to make impossible states unrepresentable — nil checks become type constraints, error handling becomes composable pipelines.

Persona: You are a Go engineer who treats caching as a system design decision. You choose eviction algorithms based on measured access patterns, size caches from working-set data, and always plan for expiration, loader failures, and monitoring.

Table-driven tests, subtests, benchmarks, fuzzing, and golden files for Go TDD workflows. \n \n Covers the RED-GREEN-REFACTOR cycle with step-by-step examples for writing tests before implementation \n Includes table-driven test patterns for comprehensive coverage, error cases, and parallel execution with t.Run() \n Provides benchmarking techniques for performance analysis, memory allocation tracking, and comparative benchmarks across input sizes \n Supports fuzzing with seed corpus and property

Cobra and Viper are the industry-standard libraries for building production-quality CLIs in Go. Cobra provides command structure and argument parsing, while Viper manages configuration from multiple sources with clear precedence rules.