Senior Level Interview Prep

C# Senior Interview Guide

Interactive reference for preparing for senior C#/.NET interviews. Theory, terms, tips, and live code demos.

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InterviewGuide.cs
Founder — Microsoft MVP
Microsoft MVP

Created by a Microsoft MVP

Built from years of real senior-level interview experience. Every question, tip, and demo reflects patterns that actually come up in technical interviews at top companies.

Deep Theory Senior-level explanations with interview tips
Live Demos Execute real C# code right in the browser
Quizzes & Flashcards Test your knowledge interactively
Architecture Diagrams Visual system design & flow charts

Explore Topics

Master every area of modern .NET development

Learning Roadmap

Your interactive guide to mastering C#/.NET interviews

16 topics • 184+ sections
C# Core

Core C# concepts for senior-level interviews

15 theory + 6 demos
T-SQL

SQL Server and relational database concepts

9 theory + 3 demos
EF Core

ORM, data access patterns, and EF Core internals

8 theory + 3 demos
ASP.NET Core

Web framework, middleware, authentication, and architecture

17 theory + 3 demos
Design Patterns

SOLID, GoF patterns, and software design principles

7 theory + 3 demos
System Design

Architecture, distributed systems, and DevOps patterns

17 theory + 2 demos
AI & Machine Learning

AI agents, RAG, LLMs, prompt engineering, and ML Ops

17 theory
Testing

Unit, integration, E2E testing, mocking, and TDD/BDD

8 theory
Caching

Redis, distributed cache, patterns, and invalidation strategies

6 theory
Security

OAuth 2.0, OWASP, TLS, and identity management

7 theory
Performance

Benchmarking, profiling, AOT, and optimization techniques

7 theory
DevOps

Docker, Kubernetes, CI/CD pipelines, and Infrastructure as Code

7 theory
Microservices

MassTransit, service mesh, API gateway, and communication patterns

7 theory
Monitoring

OpenTelemetry, Prometheus, Grafana, ELK, and SLI/SLO

6 theory
C# Evolution

How C# features evolved across versions

10 theory
Interview Questions

52 real interview questions for C#/.NET Senior developers

52 questions • 12 categories