Frontend System Designs

Frontend interviews started asking me system design questions, and I wanted to understand the subject properly, not just memorise answers. I looked for a resource that covered it from start to finish. Most of what I found taught interview technique, not system design as a whole. There were pieces everywhere, but nothing connected them. So I started building that understanding myself, and this book is the result.

Frontend development is more than writing code, building components, and working with frameworks. There is a whole system behind every frontend application, and understanding how that system works is an important part of becoming a better frontend developer.

This book explores frontend system design, starting with the basics of how the web works and gradually moving into the ideas, tools, and decisions involved in building modern frontend applications. We will explore browsers, networks, HTTP, APIs, rendering, caching, performance, security, and frontend architecture. The aim is to understand not just what these things are, but why they exist, how they work, and how they fit together.

The book is written in simple language, using everyday analogies like a trip to the grocery shop to make difficult topics easier to understand. It is for developers who can build things but want to understand why they work, including self-taught developers and anyone filling in the foundations. It’s not interview prep, though it should leave you better prepared for one.

It is also a learning journey. I am writing this as someone who has only just worked these ideas out, so I still remember where the confusion lives. As I keep learning, I will continue to document my findings, explanations, and discoveries here.

The book is still being written. Chapter 1 is complete and free to read, and new chapters will be added as the journey continues.