Go service down under load.Stabilised this session.

PM assigned in 10 minutes. Go specialist starts diagnosing within the hour. Go service failures under load commonly come from: goroutine leaks accumulating from HTTP handlers that never complete, channel deadlocks from mismatched send and receive goroutines, context cancellation not propagated to downstream calls causing open connections to accumulate, or sync.Mutex contention blocking the hot path. The engineer runs pprof goroutine and heap profiles in production (safe at low sample rates) to identify the exact bottleneck. Most Go service crashes are resolved within a single 4-hour session.

Yes. The engineer takes goroutine pprof snapshots at intervals and diffs the stack traces to identify goroutines that are growing rather than completing. Common sources: HTTP client requests without context timeouts leaving goroutines waiting on closed connections, ticker loops without a done channel to stop them, and WaitGroup misuse where Add is called after goroutines have already started. The fix is confirmed with a 30-minute load test showing stable goroutine count.

Yes. gRPC deadline exceeded errors are typically caused by: upstream service latency exceeding the default 5-second deadline, connection pool exhaustion under concurrent load, missing keepalive configuration causing idle connections to be dropped by load balancers, or serialisation overhead from large protobuf messages. The engineer audits the grpc.DialContext options, adds proper timeout propagation through context chains, and configures connection pool sizing based on observed QPS.

Go data races are notoriously hard to reproduce and are a core Go debugging specialisation. The engineer runs the service with -race enabled in a staging environment to produce race detector output, then traces the conflicting goroutines to the shared variable. Common patterns: global map written by multiple goroutines without a mutex, struct fields accessed by both a background goroutine and a request handler, and sync.Once misuse allowing initialisation races. The fix is confirmed by a clean run under -race with production-level concurrency.

Every QuickHire Go engineer passes a live debugging exercise on a broken Go microservice - real environment, time-limited, covering a goroutine leak and a channel deadlock simultaneously. Written assessment covers: the Go memory model, channel direction and select semantics, interface satisfaction, error wrapping with fmt.Errorf %w, and sync primitives (Mutex, RWMutex, WaitGroup, Once). Portfolio review confirms production Go services with real traffic. Only the top 3% of applicants pass all stages.

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