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Interview prep

Interview prep

One complete answer per question — from fundamentals to production. With examples, follow-up questions and a glossary.
Start with C# & .NETGlossary

How to use

Section titled “How to use”

Complete answer

Every question has one self-contained answer: definition, usage, internals, pitfalls and production trade-offs. The Junior / Middle / Senior badge shows the question’s difficulty.

Flashcards

Flashcards mode hides the answers: answer yourself first, then reveal.

Terms

Words with a dotted underline open a definition: on the right on desktop, at the bottom on a phone. From there — Google, docs, Wikipedia.

Self-check

“Know it / Shaky / Don’t know” under every question. Progress is kept in this browser.

Categories

Section titled “Categories”
C# & .NETPlatform, types and memory, GC, async, threading, collections and LINQ, the language.
ASP.NET CoreHosting and middleware, DI, configuration and logging, Web API, MVC and SignalR, background jobs and caching.
DatabasesSQL and T-SQL, indexes and plans, transactions and locking, EF Core, PostgreSQL, design and ETL.
Access and securityWeb security basics, OAuth 2.0 and OpenID Connect, JWT, AD, Kerberos and ADFS, authorization.
Integrations and architectureIntegration styles and resilience, queues and Kafka, outbox and sagas, architecture styles, system design.
Front endJavaScript and TypeScript, Angular from 13 to the current version, React and Next.js, the browser, CSS and performance.
DelphiObject Pascal and memory management, VCL and data access, migrating from Delphi 6 to 12/13: Unicode, FireDAC, 64-bit.
PythonThe language and its internals, asyncio and FastAPI, SQLAlchemy 2, pytest and tooling.
Node.jsThe runtime and event loop, modules, streams, NestJS and Prisma.
Quality and deliveryTesting, CI/CD and code quality, Docker and containers, observability and production diagnostics.
FundamentalsOOP, SOLID and design principles, patterns, algorithms and live coding, Git.

Tracks

Section titled “Tracks”

A track is an order of categories for a specific role.

  • Senior .NET backend: C# & .NET → ASP.NET Core → Databases → Access and security → Integrations and architecture → Quality and delivery → Fundamentals.
  • Fullstack .NET: the same track plus Front end.
  • Legacy and modernization: Delphi → Databases → Integrations and architecture.