What are the three components of system design?
The three primary components of system design are:
1. Frontend (Client-Side)
The frontend is the part of the system that users interact with directly, usually through web or mobile interfaces. It involves:
- User interface (UI) design
- User experience (UX) optimization
- Handling user input and interacting with the backend via APIs
2. Backend (Server-Side)
The backend consists of the server-side components that process requests, handle business logic, and interact with the database. Key elements include:
- Application servers: Execute the core business logic.
- APIs: Facilitate communication between the frontend and backend.
- Databases: Store and retrieve data efficiently.
3. Data Storage
Data storage encompasses the databases and file storage systems that store the application's data. This includes:
- Relational Databases (SQL): For structured data.
- NoSQL Databases: For unstructured or flexible data types.
- Caching systems: Tools like Redis or Memcached for improving data retrieval speed.
These three components work together to deliver a complete system that handles both user interactions and data processing.
For more comprehensive learning, explore resources like:
- Grokking System Design Fundamentals
- Grokking the System Design Interview for practical examples
TAGS
System Design Interview
CONTRIBUTOR
Design Gurus Team
-
GET YOUR FREE
Coding Questions Catalog
Boost your coding skills with our essential coding questions catalog.
Take a step towards a better tech career now!
Explore Answers
Bash cheat sheet: What are Top 25 commands?
What is the minimum salary in Atlassian?
How to prepare for entry level software developer interview?
What are the design flaws of Netflix?
How would you implement WAL + snapshots for fast recovery?
Learn how Write Ahead Log (WAL) plus snapshots enable fast recovery in system design interviews. Explore architecture, step-by-step working, common pitfalls, comparison table, and FAQs for scalable systems.
How long to prep for coding interview?
Related Courses

Grokking the Coding Interview: Patterns for Coding Questions
Grokking the Coding Interview Patterns in Java, Python, JS, C++, C#, and Go. The most comprehensive course with 476 Lessons.
4.6
$197

Grokking Modern AI Fundamentals
Master the fundamentals of AI today to lead the tech revolution of tomorrow.
3.9
$72

Grokking Data Structures & Algorithms for Coding Interviews
Unlock Coding Interview Success: Dive Deep into Data Structures and Algorithms.
4
$78
One-Stop Portal For Tech Interviews.
Copyright © 2026 Design Gurus, LLC. All rights reserved.