Curated .NET, React, SQL, and system design content. Free, ad-light, and built for serious learners.
A short, curated email with the newest posts and questions.
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.
No paywall, no fluff.
Hand-picked highlights worth your attention.
Engineering notes and long-form tutorials.
Delivering 15M webhooks a day to endpoints you don't control is deceptively hard. Here's the outbox + queue + retry design that never drops an event.
Chunk-and-embed RAG hits a wall at scale. Open Knowledge Format (OKF) feeds a context engine structured, governed knowledge — the Mattrx rebuild with code.
Most enterprises bolt AI onto a backend built for CRUD. We rebuilt Mattrx around nine AI-native layers in production. Here is the blueprint, with code.
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.