Go Interview Prep

Go’s simplicity makes it easy to write code, but architecture questions — how to structure a codebase, how to decouple components, how to handle dependencies — consistently come up in senior-level interviews.

Go’s error handling is explicit by design: errors are values, returned like any other value, checked by the caller. It is one of the most frequently discussed topics in Go interviews because it differs so sharply from exception-based languages.

Arrays and slices are closely related but behave very differently. Confusing them is a common source of bugs and a reliable interview topic. For a deeper runtime dive, see Slice internals.

Maps are Go’s built-in hash table. They are fast and easy to use, but they have several sharp corners that interviews frequently probe.

When goroutines share memory, you need synchronization. Go’s sync package provides the primitives for it. Prefer channels for ownership transfer; use sync when multiple goroutines must touch the same state.

Channels are Go’s primary mechanism for passing data between goroutines. The mantra is: do not communicate by sharing memory; share memory by communicating.

Goroutines are Go’s unit of concurrency. They are the first thing interviewers ask about when the topic turns to concurrency.

Interfaces are one of the most distinctive parts of Go’s type system and reliably show up in interviews. The core idea is small but the implications go deep.