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š One of the most powerful patterns in microservices engineering ā and most engineers don't know its name. The Barrier Pattern in Go is how you safely fan-out to multiple services concurrently and collect ALL results before proceeding. No partial data. No silent failures. Just clean, concurrent, production-grade aggregation. In this video, we build a complete HTTP GET aggregator using Go's Barrier Pattern: ā Fan-out to N endpoints concurrently using goroutines ā Buffered channels as the barrier mechanism ā and why the buffer size matters for correctness ā All-or-nothing error semantics ā if any endpoint fails, we report all failures ā Configurable timeouts with injectable package variables for clean testing ā Three critical test scenarios: success, partial failure, and timeout ā Production extensions: context propagation, structured logging, metrics hooks