100 Must-Know Golang Interview Questions and Answers 2025

Golang Fundamentals

1.
What is Go and why was it created?
2.
Explain the workspace architecture in Go.
3.
How is the GOPATH environment variable used?
4.
What are Go’s key features compared to other programming languages?
5.
Describe how packages are structured in a Go program.
6.
What are slices in Go, and how do they differ from arrays?
7.
Could you explain what a goroutine is?
8.
How does Go handle memory management?
9.
Can you list and explain the basic data types in Go?
10.
What is the zero value of a variable in Go?
11.
How do you manage error handling in Go?
12.
Can you convert between different data types in Go? How?
13.
What is a channel in Go, and when would you use one?
14.
Explain concurrency in Go and how it compares to parallelism.
15.
What does the range keyword do?
16.
What is defer and when would you use it?
17.
Describe the select statement in Go.
18.
What are anonymous functions and closures in Go?
19.
How do you write a unit test in Go?
20.
Can you explain what pointers are and how Go handles them?

Intermediate Golang Concepts

21.
Explain Go’s interface type and how it differs from other types.
22.
What are map and how do you manage them?
23.
Describe the blank identifier (_) and its use cases in Go.
24.
How does Go handle method overloading?
25.
What is type embedding in Go, and when would you use it?
26.
What is the purpose of the init() function?
27.
How does Go’s garbage collector work?
28.
Can you describe how Go’s type assertion works?
29.
What are struct types in Go and how do you use them?
30.
Describe the concept of package aliasing and when it would be used.
31.
How do you manage package versioning in Go modules?
32.
Explain how to create and import custom packages in Go.
33.
Describe cross-compiling in Go.
34.
What is reflection in Go and why is it useful?
35.
How does Go handle immutable strings?
36.
What is the syntax to create a variable that is not exported outside of a package?
37.
How do you implement an enum in Go?
38.
What are some ways to manage state in a concurrent Go program?
39.
How does Go’s panic and recover mechanism work?
40.
What is the purpose of the context package in Go?

Advanced Golang Concepts

41.
How does Go implement object-oriented programming concepts?
42.
Explain the difference between concurrency and parallelism in Go, with examples.
43.
What is the Go memory model?
44.
Can you manually trigger garbage collection in Go?
45.
Describe the Go race detector and when you would use it.
46.
How can you manage dependencies in a Go project?
47.
What optimizations does Go employ for its compiler?
48.
How does Go handle JSON encoding and decoding?
49.
Explain the use of build tags in Go.
50.
How do you create a custom error type in Go?
51.
Discuss the use of Go routines and thread safety.
52.
Explain how reflection is used to manipulate objects in Go.
53.
How do you use third-party packages in Go?
54.
Discuss the benefits and challenges of using channels for IPC in Go.
55.
How would you avoid deadlocks in concurrent programming in Go?
56.
What is the Stringer interface and why is it important?
57.
How do you manage database connections in Go?
58.
Describe the http package in Go for web programming.
59.
What is cgo and when would you use it?
60.
Explain the difference between iota and const in Go.

Go Tools, Testing, and Performance

61.
What is go vet and when would you use it?
62.
Describe the purpose of Go’s benchmarking tools.
63.
How do you profile Go applications?
64.
Discuss the process of writing unit tests in Go and the use of the testing package.
65.
What is the httptest package in Go, and why is it useful?
66.
How do you perform static code analysis in Go?
67.
How can you improve the performance of Go code?
68.
Explain how to use go doc to document Go code.
69.
What are the best practices for logging in Go?
70.
Describe code coverage in Go and how to measure it.

Go Patterns and Best Practices

71.
What design patterns are commonly used in Go?
72.
Describe a use case for the factory pattern in Go.
73.
When would you use the decorator pattern in Go?
74.
Explain the importance of Go’s fmt package.
75.
What are the recommended practices for error handling in Go?
76.
How do you avoid and detect memory s in Go?
77.
What is idiomatic Go code and how do you ensure it?
78.
Discuss the singleton pattern in Go.
79.
What are the best practices for structuring Go projects?
80.
How do Go routines affect the design and structure of a Go program?

Go Networking and Protocols

81.
How does Go handle HTTP/2?
82.
Describe TCP/UDP network programming in Go.
83.
Explain what RPC is and how Go supports it.
84.
How do you implement RESTful services in Go?
85.
Discuss Go’s support for WebSocket protocols.
86.
What is protobuf and how is it used in Go?
87.
Explain how to perform file uploads and downloads using Go.
88.
How do you secure web applications in Go?
89.
What is a middleware in Go’s HTTP server and how do you use it?
90.
How can Go be used to build microservices architecture?

Go Frameworks, Libraries, and Interoperability

91.
What are some popular frameworks for web development in Go, and how do you decide which one to use?
92.
Can Go interact with other programming languages, and if so, how?
93.
Discuss the use of GraphQL in Go applications.
94.
What are some use cases for the Go mobile library?
95.
How does Go integrate with cloud services?
96.
What libraries are available for building GUI applications in Go?
97.
How would you integrate a Go application with a message queue?
98.
What options are there for ORM in Go?
99.
Discuss how to use Docker with Go applications.
100.
Explain the role of WebAssembly with Go.

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100 Golang interview questions

What is Go and why was it created?

Explain the workspace architecture in Go.

How is the GOPATH environment variable used?

What are Go’s key features compared to other programming languages?

Describe how packages are structured in a Go program.

What are slices in Go, and how do they differ from arrays?

Could you explain what a goroutine is?

How does Go handle memory management?

Can you list and explain the basic data types in Go?

What is the zero value of a variable in Go?

How do you manage error handling in Go?

Can you convert between different data types in Go? How?

What is a channel in Go, and when would you use one?

Explain concurrency in Go and how it compares to parallelism.

What does the range keyword do?

What is defer and when would you use it?

Describe the select statement in Go.

What are anonymous functions and closures in Go?

How do you write a unit test in Go?

Can you explain what pointers are and how Go handles them?

Explain Go’s interface type and how it differs from other types.

What are map and how do you manage them?

Describe the blank identifier (_) and its use cases in Go.

How does Go handle method overloading?

What is type embedding in Go, and when would you use it?

What is the purpose of the init() function?

How does Go’s garbage collector work?

Can you describe how Go’s type assertion works?

What are struct types in Go and how do you use them?

Describe the concept of package aliasing and when it would be used.

How do you manage package versioning in Go modules?

Explain how to create and import custom packages in Go.

Describe cross-compiling in Go.

What is reflection in Go and why is it useful?

How does Go handle immutable strings?

What is the syntax to create a variable that is not exported outside of a package?

How do you implement an enum in Go?

What are some ways to manage state in a concurrent Go program?

How does Go’s panic and recover mechanism work?

What is the purpose of the context package in Go?

How does Go implement object-oriented programming concepts?

Explain the difference between concurrency and parallelism in Go, with examples.

What is the Go memory model?

Can you manually trigger garbage collection in Go?

Describe the Go race detector and when you would use it.

How can you manage dependencies in a Go project?

What optimizations does Go employ for its compiler?

How does Go handle JSON encoding and decoding?

Explain the use of build tags in Go.

How do you create a custom error type in Go?

Discuss the use of Go routines and thread safety.

Explain how reflection is used to manipulate objects in Go.

How do you use third-party packages in Go?

Discuss the benefits and challenges of using channels for IPC in Go.

How would you avoid deadlocks in concurrent programming in Go?

What is the Stringer interface and why is it important?

How do you manage database connections in Go?

Describe the http package in Go for web programming.

What is cgo and when would you use it?

Explain the difference between iota and const in Go.

What is go vet and when would you use it?

Describe the purpose of Go’s benchmarking tools.

How do you profile Go applications?

Discuss the process of writing unit tests in Go and the use of the testing package.

What is the httptest package in Go, and why is it useful?

How do you perform static code analysis in Go?

How can you improve the performance of Go code?

Explain how to use go doc to document Go code.

What are the best practices for logging in Go?

Describe code coverage in Go and how to measure it.

What design patterns are commonly used in Go?

Describe a use case for the factory pattern in Go.

When would you use the decorator pattern in Go?

Explain the importance of Go’s fmt package.

What are the recommended practices for error handling in Go?

How do you avoid and detect memory s in Go?

What is idiomatic Go code and how do you ensure it?

How is the `GOPATH` environment variable used?

What does the `range` keyword do?

What is `defer` and when would you use it?

Describe the `select` statement in Go.

What is the purpose of the `init()` function?

What is the purpose of the `context` package in Go?

Describe the `http` package in Go for web programming.

Explain the difference between `iota` and `const` in Go.

What is `go vet` and when would you use it?

Discuss the process of writing unit tests in Go and the use of the `testing` package.

What is the `httptest` package in Go, and why is it useful?

Explain how to use `go doc` to document Go code.