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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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Hand-picked highlights worth your attention.
Engineering notes and long-form tutorials.
30 senior C# interview questions with deep answers and real production code: async/await, GC and memory, the type system, LINQ, and concurrency.
30 senior Angular interview questions with deep answers and real code: change detection, OnPush, RxJS operators, signals, and performance.
OnPush, trackBy, lazy loading, Signals, and standalone components — the Angular 19 performance playbook with real production metrics from Mattrx.
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.