Goroutines & Channels interview questions

The scheduler, channel semantics, select, context cancellation, and detecting goroutine leaks.

3 questions in Go.

Go for infrastructure and servicesA 20-minute read on how the topic fits together, before the questions.Go fundamentals60 short answers on one page, for revising rather than studying.

medium3

mediumConceptCodingScenario

How do goroutines leak, and how would you find a leak in a running service?

A goroutine leak in Go happens when a goroutine blocks forever on a send, receive, network call or abandoned worker path. Find it with goroutine counts and pprof, then add cancellation to every blocking operation. Use this goroutines answer to show the decision, trade-off, and evidence rather than a memorised definition. It also connects channels to the point an interviewer is testing.

5 minmid, senior, staff

mediumConceptDesign

What are the subtle trade-offs and failure modes when scaling Goroutines & Channels in production?

Evaluate architectural trade-offs in Goroutines & Channels between consistency, throughput, operational complexity, and data durability at scale. Use this GOLANG answer to show the decision, trade-off, and evidence rather than a memorised definition.

1 minmid, senior

mediumConceptCodingDesign

Several producers write to one channel and one consumer reads it. Who closes the channel?

In Go, the sender closes a channel when no more values will be sent; receivers do not close it just because they are done. Multiple senders need coordination so close happens exactly once after all sends finish. Use this channels answer to show the decision, trade-off, and evidence rather than a memorised definition. It also connects goroutines to the point an interviewer is testing.

4 minmid, senior