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
Arslan Ahmad
ex-FAANG engineering manager and author or Grokking series.
-
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
What to Expect in the Roblox System Design Interview
Roblox design rounds run gaming physics: real-time multiplayer state, matchmaking, virtual economies, and safety systems at platform scale, with latency and fault tolerance graded hard.
Grokking system design courses with corporate partnerships and discounts
Find every discount, bundle, corporate plan, and promo code for Grokking System Design courses. Covers Design Gurus bundles, Educative team plans, seasonal sales, and employer-sponsored options.
What is the main focus of Tesla?
What questions does Microsoft ask?
When to use a design pattern?
What should I say in a coding interview?
Related Courses
New
Grokking the AI System Design Interview
Learn to design AI systems the way interviewers expect: classic ML products, LLM and RAG architectures, and agentic systems, all through the lens of the system design interview.
4.8
(1,192 learners)
$123
Grokking the Coding Interview: Patterns for Coding Questions
The 24 essential patterns behind every coding interview question. Available in Java, Python, JavaScript, C++, C#, and Go. The most comprehensive coding interview course with 543 lessons. A smarter alternative to grinding LeetCode.
4.6
$197
Grokking Modern AI Fundamentals
Master the fundamentals of AI today to lead the tech revolution of tomorrow.
4.1
$72
One-Stop Portal For Tech Interviews.
Copyright © 2026 Design Gurus, LLC. All rights reserved.