This course exists because most system design resources either go too deep too fast, or stay too shallow to be useful. This one is built differently.
Who this course is for
You are an engineer who can write code. Maybe you have one to five years of experience. Maybe you are self-taught. Either way, you want to get better at designing systems — and you probably have an interview coming up where system design will be evaluated.
This course does not assume you already know what a load balancer is or how a database replication strategy works. It builds every concept from scratch, in plain language, before asking you to apply it.
What this course covers
The course is organized into 12 parts, moving from fundamentals to full system design walkthroughs. Here is the progression:
- Parts 1–3 — Foundations: what system design is, how networking and protocols work, web and API concepts.
- Parts 4–6 — Core infrastructure: architectural patterns, distributed systems, databases, and storage.
- Parts 7–8 — System qualities: reliability, availability, observability, and security.
- Part 9 — Interview mechanics: how to structure answers, estimate scale, and discuss tradeoffs.
- Part 10 — 13 real case studies: design a URL shortener, chat app, video platform, search engine, and more.
- Parts 11–12 — Advanced patterns and final interview preparation.
What this course will not do
It will not memorize patterns for you. System design interviews test your ability to reason through trade-offs in real time. No amount of memorization replaces that skill. What the course gives you is enough knowledge about each building block that you can reason clearly when an interviewer pushes you in a direction you did not expect.
A practical note on depth
Each lesson targets a single concept and explains it as concisely as possible without sacrificing accuracy. When a topic has multiple lessons, the first one gives you the mental model; later lessons add the details. You do not need to read everything sequentially — the sidebar and cheat sheets at the end of each section make it easy to jump to what you need.
- Interviewers evaluate your thought process, not just your final answer. Starting with a strong mental model matters more than knowing every detail.
- Companies vary in interview format — some give you a specific system to design; others give an open-ended scenario. This course prepares you for both.
- Being clear about what you know versus what you are uncertain about is itself a signal interviewers look for positively.
- The engineers who tend to do best are those who practice explaining systems out loud — not just reading about them.