Engineering · Stable
.NET Developer: Skills, Projects & Interview Questions (2026)
Build enterprise web applications and APIs with C# and the .NET platform.
What a .NET Developer actually does
Building ASP.NET Core APIs, modeling data with EF Core, and shipping features on enterprise .NET systems.
Top hiring companies: Microsoft, TCS, Accenture, Infosys, Cognizant, Capgemini.
Top industries: IT Services, BFSI, Enterprise Software, Healthcare, Insurance.
Skills you need to become a .NET Developer
| Skill | Importance | Learning hours | Interview weight |
|---|---|---|---|
| C# Language | 10/10 | ~50h | High |
| ASP.NET Core | 10/10 | ~45h | High |
| Entity Framework Core | 9/10 | ~35h | High |
| REST API Design | 9/10 | ~30h | High |
| SQL Server & Databases | 8/10 | ~40h | High |
| OOP & SOLID Principles | 9/10 | ~30h | High |
| LINQ | 8/10 | ~25h | Medium |
| Async/Await & Multithreading | 8/10 | ~30h | High |
| Dependency Injection | 8/10 | ~20h | Medium |
| Unit Testing (xUnit / NUnit) | 7/10 | ~25h | Medium |
| Azure & Cloud Deployment | 7/10 | ~30h | Medium |
| Design Patterns | 7/10 | ~25h | Medium |
Core tools: Visual Studio, .NET SDK, SQL Server, Entity Framework Core, Azure, Docker, Git, Postman.
.NET Developer learning roadmap
Beginner · 2-3 months
C# & .NET fundamentals
Build: Build a REST CRUD Web API with ASP.NET Core and EF Core.
Intermediate · 3-4 months
Web apps & clean architecture
Build: Build a layered API with CQRS, MediatR, and authentication.
Advanced · 3-4 months
Production, scale & specialization
Build: Build .NET microservices with an API gateway, gRPC, and Docker.
9 .NET Developer portfolio projects
Console App with LINQ
BeginnerBuild a data-processing console app using LINQ and collections.
Skills: C#, LINQ, OOP
REST API with ASP.NET Core
BeginnerBuild a CRUD Web API with EF Core and SQL Server.
Skills: ASP.NET Core, EF Core, REST
MVC Web Application
IntermediateBuild a full MVC app with authentication and Razor views.
Skills: ASP.NET Core MVC, EF Core, Identity
Clean Architecture API
IntermediateBuild a layered API with CQRS, MediatR, and request validation.
Skills: Clean Architecture, CQRS, MediatR
Blazor Dashboard
IntermediateBuild an interactive dashboard with Blazor and a Web API.
Skills: Blazor, C#, REST
Real-Time App with SignalR
IntermediateBuild a real-time notifications feature with SignalR.
Skills: SignalR, ASP.NET Core, WebSockets
Background Worker Service
IntermediateBuild a hosted service that processes a queue on a schedule.
Skills: Worker Service, Async, Queues
Microservices with .NET
AdvancedBuild microservices with an API gateway, gRPC, and Docker.
Skills: Microservices, gRPC, Docker
E-commerce Backend
AdvancedBuild catalog, cart, and orders with clean layering and tests.
Skills: ASP.NET Core, EF Core, SQL Server
Common .NET Developer interview questions
Difference between value types and reference types in C#.Easy
What they're testing: Stack-copied structs vs heap-referenced classes
Difference between IEnumerable and IQueryable.Medium
What they're testing: In-memory deferred iteration vs query translated to SQL at the source
Explain async/await and how it works under the hood.Hard
What they're testing: Compiler builds a state machine that frees the thread during awaited I/O
What is dependency injection and how does ASP.NET Core support it?Medium
What they're testing: Invert dependencies; a built-in DI container manages scoped/singleton/transient lifetimes
Explain the SOLID principles.Medium
What they're testing: Five OOP design principles for maintainable, decoupled code
Difference between an abstract class and an interface.Easy
What they're testing: Shared implementation/state vs a contract (with optional default methods)
What are the EF Core loading strategies?Medium
What they're testing: Eager, lazy, and explicit loading of related entities
Difference between Task and Thread.Medium
What they're testing: High-level async work unit on the thread pool vs a raw OS thread
What is middleware in ASP.NET Core?Medium
What they're testing: Ordered components in the request pipeline registered via app.Use
Explain garbage collection and IDisposable.Hard
What they're testing: Generational GC reclaims managed memory; Dispose handles timely/unmanaged cleanup
Difference between const and readonly.Easy
What they're testing: Compile-time constant vs a field set once at runtime in the constructor
How do you handle exceptions and logging in a Web API?Medium
What they're testing: try/catch plus exception-handling middleware and structured logging
Certifications for .NET Developers
- Microsoft Certified: Azure Developer Associate (AZ-204)Microsoft · Very High value
- Microsoft Certified: DevOps Engineer Expert (AZ-400)Microsoft · High value
- Microsoft Certified: Azure Fundamentals (AZ-900)Microsoft · Medium value
- Foundational C# with MicrosoftMicrosoft / freeCodeCamp · Medium value
.NET Developer career path
.NET Developer -> Senior .NET Developer -> Tech Lead / Solutions Architect
Common moves into this role / from here:
- → Full-Stack Developer (3-4 months) — close: Frontend (Angular/React/Blazor), REST integration, UI fundamentals
- → Azure Cloud Engineer (4-6 months) — close: Azure services, IaC, networking, CI/CD, monitoring
- → Backend Engineer (4-6 months) — close: System design, distributed systems, DSA, cross-language exposure
Related roles: Full-Stack Developer, Backend Engineer, Azure Cloud Engineer, Software Engineer
Frequently asked questions
What skills do you need to become a .NET Developer?
Core skills include C# Language, ASP.NET Core, Entity Framework Core, REST API Design, SQL Server & Databases. Solidify OOP, SOLID, and async/await in C#, since .NET interviews probe language internals as much as frameworks.
What projects should a .NET Developer build for a portfolio?
Strong starter projects: Console App with LINQ; REST API with ASP.NET Core; MVC Web Application; Clean Architecture API.
How long does it take to become job-ready as a .NET Developer?
A focused plan runs roughly 2-3 months for fundamentals, then applied projects. Difficulty rating: 5/10.
What is the career path for a .NET Developer?
.NET Developer -> Senior .NET Developer -> Tech Lead / Solutions Architect
Ready to become a .NET Developer?
PrepNPlaced turns this guide into action — a day-by-day roadmap, ATS-ready resume, and real interview practice.
Start free →