Introduction
Frontend System Design is all the rage now. Everyone is discussing it, creating courses, sharing resources, and providing study paths. This guide is not your typical course or study plan that only covers multiple systems and discusses how to build them rather we will also focus on realistic guidelines to create a framework that applies to any frontend system design round you might face.
It is built based on real interview experiences from both sides of the table and includes actual interviewer perspectives. It focuses on framework rather than memorisation and covers various core topics such as communication strategy, requirements engineering, architectural consideration, data entities and APIs discussion, technology stack selection framework, commonly asked questions by the interviewers, questions the candidate should ask the interviewer, common pitfalls analysis, performance discussion, optimisation techniques discussion, judging criteria, and a dedicated section to cover concepts commonly occurring in frontend system design interviews.
The learnings in this guide have helped many frontend engineers grab 50+ LPA to 1 Cr offers from top companies. It is constantly updated based on the latest industry trends and interview patterns. We also include practical implementation using examples such as Google Calendar, WhatsApp Web UI, Autocomplete, and more.
What is Frontend System Design (FSD)?
FSD is not some mysterious or rare concept that you will only see in interviews. If you are writing code, building applications, and deploying any web app then you are already exposed to system design aspects. For example — suppose a frontend engineer is working on creating dashboards at their organisation.
- They are most likely following user stories created by the product team.
- Converting designs/Figma screens by the design team into code.
- Thinking about which technology should I use?
- Figuring out which animation library/NPM package is efficient, easy to use, low in size, and best suited for the project.
- How can I improve the performance of the dashboard? Do I need virtualisation? Do I need to paginate the data?
- Which user metrics (FCP, LCP, and others) make the most sense?
- And more.
This is what system design is and you are already exposed to it every day! In modern companies, frontend engineers are expected to make these architectural choices, because they directly impact user experience, developer velocity, and system reliability. However, in an interview, we need guidance to structure our thought process, figure out which solution is best suited, and when/how should we make a certain choice. This guide will help you answer these questions and much more!
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