Top 50 Go (Golang) Interview Questions & Answers (2026)

01 What is Go and who created it? 02 What is a goroutine in Go? 03 What is a channel in Go? 04 What is the defer statement in Go? 05 How are packages and imports used in Go? 06 What is a struct in Go? 07 What is an interface in Go? 08 How do pointers work in Go? 09 How does error handling work in Go? 10 What is the difference between a slice and an array in Go? 11 How do maps work in Go? 12 How does the range loop work in Go? 13 What are multiple return values in Go and why are they useful? 14 What is the blank identifier (_) in Go? 15 How do constants and iota work in Go? 16 What is the init function in Go? 17 What is the difference between go run and go build? 18 What is the difference between GOPATH and Go modules? 19 What are zero values in Go? 20 What is a type declaration in Go?

01 What is the context package and why is it important? 02 What is sync.Mutex and when do you use it? 03 What is sync.WaitGroup in Go? 04 What is sync.Once in Go? 05 What is the select statement in Go? 06 What are buffered channels and when are they useful? 07 What is a closure in Go? 08 What is struct embedding in Go? 09 What are type assertions and type switches in Go? 10 What is reflection in Go and when should you use it? 11 What is table-driven testing in Go? 12 What does the -race flag do in go test? 13 What is go generate in Go? 14 What are build tags in Go? 15 How do io.Reader and io.Writer work in Go? 16 How do you build an HTTP server in Go using net/http? 17 How does JSON encoding and decoding work in Go? 18 What is a goroutine leak and how do you detect it? 19 What is panic and recover in Go? 20 What is fmt.Errorf with %w and how do errors.Is / errors.As work?

01 Explain the Go scheduler and the GMP model. 02 How does Go's garbage collector work? 03 What is escape analysis in Go? 04 What are generics in Go and how do they work? 05 How do you profile a Go program with pprof? 06 What is the unsafe package and when is it appropriate to use it? 07 How does CGo work in Go? 08 What is the Go plugin system? 09 How does cross-compilation work in Go? 10 What is the Go module proxy and how does workspace mode work?