Latest · AI Engineering
How to Test Go Code That Calls an LLM
Non-determinism does not have to mean untestable. Wrapping the model behind an interface, faking it in unit tests, golden files for prompt assembly, and the small…
32 articles · Go · Backend · Performance
Go & web development,
explained by example
Practical tutorials on Go, backend architecture, performance and DevOps — every post built around code you can run.
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AI Engineering
Prompt Caching: The Cheapest Win in Your LLM Bill
Prompt caching is a prefix match, and one stray timestamp can silently disable it. How cache breakpoints, TTLs and the usage fields actually work — and how to build…
AI Engineering
Tool Use in Go: Building an Agent Loop You Can Actually Debug
How LLM tool use really works in Go: the agentic loop, the SDK's tool runner, parallel tool calls, bounded concurrency, returning errors as tool results, and the…
AI Engineering
Calling an LLM from Go: Streaming, Timeouts and the Parts That Bite
A practical guide to wiring Claude into a Go service with the official SDK: content blocks, adaptive thinking, streaming, context deadlines, typed errors and the…
Go Programming
Rate Limiting Go APIs with golang.org/x/time/rate
Protect your Go HTTP APIs with token bucket rate limiting: per-client limiters, middleware, the standard rate limit headers, client-side throttling and when to move…
Go Programming
Worker Pools in Go: Bounded Concurrency with errgroup
Stop spawning unbounded goroutines. A practical guide to worker pools in Go using channels, sync.WaitGroup and errgroup.SetLimit — with error propagation,…
Go Programming
Graceful Shutdown in Go Web Services: Stop Dropping Requests on Deploy
How to shut down a Go HTTP server without dropping in-flight requests: signal.NotifyContext, Server.Shutdown, draining background workers, and the timeouts that make…
Go Programming
Structured Logging in Go with log/slog: A Practical Guide
Replace fmt-style logging with Go's built-in log/slog package: JSON handlers, levels, context-aware loggers, grouped attributes and request-scoped fields, with…
Go Programming
Error Handling in Go: Wrapping, Sentinel Errors and errors.Is/As
A practical guide to Go error handling — wrapping with %w, sentinel errors, custom error types, errors.Is and errors.As, and where each one belongs in a real…
Go Programming
Why Use Golang: 9 Compelling Reasons for Your Next Project
Wondering why use Golang? Explore nine practical reasons — speed, concurrency, tooling and more — that make Go a top choice for modern back-end systems.