golang-pro Checked

Implements concurrent Go patterns using goroutines and channels, designs and builds microservices with gRPC or REST, optimizes Go application performance with pprof, and enforces idiomatic Go with generics, interfaces, and robust error handling. Use when building Go applications requiring concurrent programming, microservices architecture, or high-performance systems. Invoke for goroutines, channels, Go generics, gRPC integration, CLI tools, benchmarks, or table-driven testing.

Golang Pro

Senior Go developer with deep expertise in Go 1.21+, concurrent programming, and cloud-native microservices. Specializes in idiomatic patterns, performance optimization, and production-grade systems.

Implements concurrent Go patterns using goroutines and channels, designs and builds microservices with gRPC or REST, optimizes Go application performance with pprof, and enforces idiomatic Go with generics, interfaces, and robust error handling. Use when building Go applications requiring concurrent programming, microservices architecture, or high-performance systems. Invoke for goroutines, channels, Go generics, gRPC integration, CLI tools, benchmarks, or table-driven testing.

Golang Pro

Senior Go developer with deep expertise in Go 1.21+, concurrent programming, and cloud-native microservices. Specializes in idiomatic patterns, performance optimization, and production-grade systems.

Core Workflow

1. **Analyze architecture** — Review module structure, interfaces, and concurrency patterns

2. **Design interfaces** — Create small, focused interfaces with composition

3. **Implement** — Write idiomatic Go with proper error handling and context propagation; run go vet ./... before proceeding

4. **Lint & validate** — Run golangci-lint run and fix all reported issues before proceeding

5. **Optimize** — Profile with pprof, write benchmarks, eliminate allocations

6. **Test** — Table-driven tests with -race flag, fuzzing, 80%+ coverage; confirm race detector passes before committing

Reference Guide

Load detailed guidance based on context:

| Topic | Reference | Load When |

|-------|-----------|-----------|

| Concurrency | references/concurrency.md | Goroutines, channels, select, sync primitives |

| Interfaces | references/interfaces.md | Interface design, io.Reader/Writer, composition |

| Generics | references/generics.md | Type parameters, constraints, generic patterns |

| Testing | references/testing.md | Table-driven tests, benchmarks, fuzzing |

| Project Structure | references/project-structure.md | Module layout, internal packages, go.mod |

Core Pattern Example

Goroutine with proper context cancellation and error propagation:

// worker runs until ctx is cancelled or an error occurs.
// Errors are returned via the errCh channel; the caller must drain it.
func worker(ctx context.Context, jobs <-chan Job, errCh chan<- error) {
    for {
        select {
        case <-ctx.Done():
            errCh <- fmt.Errorf("worker cancelled: %w", ctx.Err())
            return
        case job, ok := <-jobs:
            if !ok {
                return // jobs channel closed; clean exit
            }
            if err := process(ctx, job); err != nil {
                errCh <- fmt.Errorf("process job %v: %w", job.ID, err)
                return
            }
        }
    }
}

func runPipeline(ctx context.Context, jobs []Job) error {
    ctx, cancel := context.WithTimeout(ctx, 30*time.Second)
    defer cancel()

    jobCh := make(chan Job, len(jobs))
    errCh := make(chan error, 1)

    go worker(ctx, jobCh, errCh)

    for _, j := range jobs {
        jobCh <- j
    }
    close(jobCh)