Top Go (Golang) Interview Questions & Answers: A Complete Beginner-to-Advanced Guide
Go (Golang) has become a top choice for building high-performance, scalable systems.
This blog covers the most frequently asked Go interview questions, clearly divided into Beginner, Intermediate, and Advanced levels.
Each answer includes key technical keywords, real-world insights, and future-ready guidance to help you confidently crack Go interviews.
🔰 Beginner-Level Go Interview Questions
1. What is Go (Golang)?
Go is an open-source, statically typed, compiled programming language developed by Google, designed for simplicity, concurrency, and performance.
Technical Keywords:
Statically typed, compiled language, garbage collection, concurrency
2. What are the main features of Go?
Key features include:
- Fast compilation
- Built-in concurrency using goroutines
- Strong standard library
- Automatic memory management
Technical Keywords:
Goroutines, standard library, garbage collector
3. What is a goroutine?
A goroutine is a lightweight thread managed by the Go runtime for concurrent execution.
Technical Keywords:
Concurrency, lightweight thread, Go scheduler
4. What is a package in Go?
A package is a namespace that groups related Go source files and functions together.
Technical Keywords:
Code modularity, package main, import keyword
5. What is the difference between var and :=?
varis used for explicit declaration:=is used for short variable declaration inside functions
Technical Keywords:
Type inference, variable declaration
⚙️ Intermediate-Level Go Interview Questions
6. What are channels in Go?
Channels are typed conduits that allow goroutines to communicate safely.
Technical Keywords:
Inter-goroutine communication, synchronization, message passing
7. What is the difference between buffered and unbuffered channels?
- Unbuffered channels block until data is received
- Buffered channels allow sending without immediate receiving
Technical Keywords:
Blocking, non-blocking communication, buffer capacity
8. What is a struct in Go?
A struct is a composite data type used to group variables of different types.
Technical Keywords:
Composite type, data modeling, struct fields
9. What are interfaces in Go?
Interfaces define method signatures without implementation, enabling polymorphism.
Technical Keywords:
Duck typing, abstraction, loose coupling
10. What is error handling in Go?
Go uses explicit error handling by returning error values instead of exceptions.
Technical Keywords:
error interface, explicit error handling
🚀 Advanced-Level Go Interview Questions
11. What is the Go scheduler?
The Go scheduler manages execution of goroutines using M:N scheduling, mapping goroutines to OS threads.
Technical Keywords:
GOMAXPROCS, M:N scheduling, runtime scheduler
12. What is garbage collection in Go?
Go uses a concurrent, tri-color mark-and-sweep garbage collector to manage memory efficiently.
Technical Keywords:
Memory management, GC pauses, heap allocation
13. What are Race Conditions and How to Prevent Them?
Answer:
Race conditions occur when multiple goroutines access shared data simultaneously.
Prevention Techniques:
- Mutex (
sync.Mutex) - Channels
- Atomic operations
Technical Keywords:
Race condition, synchronization, thread safety
🔰 Beginner-Level (Additional Questions)
14.What is web.config in ASP.NET?
web.config is an XML configuration file used to manage application-level settings.
Technical Keywords:
Configuration management, connection strings, authentication settings
15. What is the purpose of appSettings?
appSettings stores custom key-value pairs used throughout the application.
Technical Keywords:
Configuration keys, centralized settings.
16. What is IIS and its role in ASP.NET?
IIS (Internet Information Services) is a web server that hosts ASP.NET applications.
Technical Keywords:
Request processing, application pools, hosting environment
17. What is IsPostBack?
IsPostBack checks whether a page is loaded for the first time or due to a postback.
Technical Keywords:
Page lifecycle, state management
⚙️ Intermediate-Level (Additional Questions)
18. What is Model Validation in ASP.NET Core?
Model validation ensures incoming request data meets defined validation rules.
Technical Keywords:
Data annotations, model binding, server-side validation
19. What is IActionResult vs ActionResult?
IActionResultis an interfaceActionResultis a base class implementing it
Technical Keywords:
Abstraction, flexible response types
20. What is Logging in ASP.NET Core?
Logging records application events for monitoring and debugging.
Technical Keywords:
ILogger, structured logging, diagnostics
21. What is Filters Pipeline in ASP.NET MVC?
Filters allow execution of logic at different stages of the request lifecycle.
Types:
Authorization, Action, Result, Exception
22. What is Partial View?
Partial views allow reuse of UI components across multiple views.
Technical Keywords:
Modular UI, reusable components
🚀 Advanced-Level (Additional Questions)
23.What is API Rate Limiting?
Rate limiting controls the number of API requests to prevent abuse and overload.
Technical Keywords:
Throttling, API gateway, security
24. What is CORS in ASP.NET Core?
CORS enables controlled cross-origin HTTP requests.
Technical Keywords:
Cross-origin policy, security headers
25. What is Health Checks in ASP.NET Core?
Health checks monitor application availability and dependencies.
Technical Keywords:
Service monitoring, readiness probes
26. What is Background Service in ASP.NET Core?
Background services run long-running tasks independently of HTTP requests.
Technical Keywords:
Hosted services, worker services
27. How does ASP.NET Core support Microservices?
ASP.NET Core supports microservices via:
- Lightweight APIs
- Docker integration
- Cloud-native hosting
Technical Keywords:
Microservices architecture, containerization
🧠 Scenario-Based Interview Question
28. How would you secure an ASP.NET Core API?
Security measures include:
- JWT authentication
- HTTPS enforcement
- Role-based authorization
- Input validation
Technical Keywords:
Token-based security, claims-based authorization
What is Dependency Injection (DI) in ASP.NET Core?
Answer:
Dependency Injection is a design pattern that decouples object creation from usage, improving testability, scalability, and maintainability. ASP.NET Core has built-in DI container support.
Keywords: Inversion of Control (IoC), DI container, loose coupling
17. What is Middleware in ASP.NET Core?
Answer:
Middleware is a pipeline of components that handle HTTP requests and responses. Each middleware can process, modify, or short-circuit requests.
Keywords: Request pipeline, HTTP context, cross-cutting concerns
18. Difference between IEnumerable, IQueryable, and List?
Answer:
| TypeExecutionUse Case | ||
| IEnumerable | In-memory | Small data |
| IQueryable | Deferred (DB) | Large data |
| List | Immediate | Fast iteration |
Keywords: Deferred execution, LINQ, query optimization
19. What is Caching in ASP.NET?
Answer:
Caching stores frequently used data in memory to reduce database calls and improve application performance.
Types:
- In-Memory Cache
- Distributed Cache (Redis)
- Response Caching
Keywords: Performance optimization, scalability
20. What is Model Binding in ASP.NET?
Answer:
Model Binding automatically maps HTTP request data to action method parameters.
Keywords: MVC pattern, HTTP request mapping
21. Difference between Authentication and Authorization?
Answer:
- Authentication: Verifies who the user is
- Authorization: Determines what the user can access
Keywords: Identity, security, role-based access
22. What is Entity Framework Core?
Answer:
EF Core is an ORM (Object Relational Mapper) that allows developers to work with databases using C# objects instead of SQL queries.
Keywords: ORM, LINQ, database abstraction
23. What is a Deadlock?
Answer:
A deadlock occurs when two or more threads wait indefinitely for each other’s resources.
Prevention:
- Lock ordering
- Timeout locks
- Avoid nested locks
Keywords: Concurrency, thread synchronization
24. What is Cross-Site Request Forgery (CSRF)?
Answer:
CSRF is a security attack where unauthorized commands are executed on behalf of an authenticated user.
Prevention:
- Anti-Forgery Tokens
- SameSite Cookies
Keywords: Web security, attack prevention
25. What is Kestrel Server?
Answer:
Kestrel is a cross-platform, high-performance web server used by ASP.NET Core.
Keywords: Web server, performance, cross-platform
26. What is SignalR?
Answer:
SignalR enables real-time communication between client and server using WebSockets.
Keywords: Real-time apps, WebSockets, push notifications
27. What is API Versioning?
Answer:
API Versioning allows multiple versions of an API to coexist.
Methods:
- URL-based
- Header-based
- Quer
28.What is Middleware in ASP.NET Core?
Middleware is a pipeline of components that handle HTTP requests and responses. Each middleware can process, modify, or short-circuit requests.
Keywords: Request pipeline, HTTP context, cross-cutting concerns
29.What is Dependency Injection (DI) in ASP.NET Core?
Dependency Injection is a design pattern that decouples object creation from usage, improving testability, scalability, and maintainability. ASP.NET Core has built-in DI container support.
Keywords: Inversion of Control (IoC), DI container, loose coupling
30.What is Thread Safety in ASP.NET?
Thread safety ensures that shared resources behave correctly when accessed by multiple threads simultaneously. In ASP.NET, every request may run on a separate thread, so improper handling of shared objects can cause race conditions and data corruption.
Keywords: Thread safety, multithreading, shared resources, synchronization
Pro Tips
- Master goroutines and channels thoroughly
- Practice concurrency-related problems
- Understand real-world system design use cases
- Learn Go’s standard library deeply
- Use tools like
go testandgo vet
Common Mistakes to Avoid
- Overusing goroutines without synchronization
- Ignoring error handling
- Sharing mutable state across goroutines
- Not understanding Go’s memory model
- Writing Java-style code in Go
Tags
- What is Go language used for?
- Is Go better than Java or Python?
- How to prepare for Go interviews?
- What are goroutines and channels in Go?