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PrepStack is a tech learning hub for developers. We publish long-form articles on .NET, React, AI/ML, and SaaS architecture — and a growing library of categorised interview questions with detailed answers across .NET, React, SQL, and system design.
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30 senior LINQ interview questions with deep C# answers: deferred execution, IQueryable vs IEnumerable, EF translation, performance, and pitfalls.
30 senior design patterns interview questions with deep C# answers: creational, structural, behavioral patterns, CQRS, and when NOT to use a pattern.
30 senior JavaScript interview questions with deep answers and real code: closures, the event loop, prototypes, async/await, memory leaks, and modules.
Real questions with detailed answers, ranked by difficulty.
Drill straight into a stack you care about.
When to reach for Minimal APIs, when to stick with controllers, and how to structure a maintainable codebase.
Stop fighting the new boundary. A short field guide for engineers shipping App Router apps.
Schema-per-tenant vs shared schema, edge caching, and how to defer paid infra until you actually need it.