Core Building Blocks
Blob storage is used for large files such as images, videos, PDFs, logs, and backups. In interviews, the most common pattern is simple: store metadata in the database, and store the actual file in object storage. What blob storage is Blob storage, also called object storage, stores unstructured binary data.
Core Building Blocks
A message queue helps you move slow or unreliable work out of the main request path. In interviews, it is one of the clearest ways to improve latency, reliability, and system flexibility. What a message queue does A message queue lets one service send a task or event to another
Core Building Blocks
A CDN helps users download content from servers close to them. In interviews, CDN is usually the right tool for static files, images, videos, and other content that can be cached at the edge. What a CDN does CDN means Content Delivery Network. It is a network of edge servers
Core Building Blocks
A cache is a fast storage layer used to reduce latency and database load. In system design interviews, cache is one of the most common tools, but you should only use it when the read pattern makes sense. What a cache does A cache stores frequently accessed data in memory.
Core Building Blocks
Your job is not to name a database randomly. Your job is to explain what data you need to store, how you will query it, and what consistency you need. What a database does A database stores the main business data of your system. Examples: * users * orders * payments * posts * messages
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A 30-day plan gives you enough time to build real system design interview skill. The goal is not to read as much as possible. The goal is to practice the same thinking process across many problems. How to use this plan This plan is designed for busy engineers. You
Quick Start
If your interview is coming soon, you do not have time to learn everything. This 7-day plan focuses on the highest-value topics and the most common interview moves. Who this plan is for Use this plan if: * your system design interview is within one week, * you have some
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Most candidates do not fail system design interviews because they do not know enough technologies. They fail because their answer is unclear, unstructured, or too shallow. Mistake 1: Starting with a diagram too early Many candidates hear the prompt and immediately start drawing boxes. This is risky. If you do
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A 50-minute system design interview goes by very fast. If you do not manage time well, you may spend too long on requirements and never reach the deep dive. This article gives you a simple structure to follow. The 50-minute structure Use this as your default interview plan.
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A system design interview is not testing whether you can draw a perfect architecture from memory. It is testing how you think through an unclear problem, make tradeoffs, and explain your decisions. The big picture In a coding interview, the problem is usually well defined. In a system design interview,
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Who this guide is for This guide is for software engineers who want a simple, clear way to prepare for system design interviews. It is especially useful if you feel one of these is true: * You have read system design materials, but still do not know how to speak in