If your goal is to become a Senior Software Engineer, System Design Expert, or crack interviews at Google, Amazon, Microsoft, Meta, Uber, Netflix, then you should follow a structured roadmap.
The biggest mistake people make is directly jumping to "Design YouTube" or "Design WhatsApp."
Instead, System Design should be learned exactly like mathematics:
Learn Numbers → Addition → Multiplication → Algebra → Calculus
Similarly,
Learn Basics → Components → LLD → HLD → Distributed Systems → Real World Projects
🚀 Complete System Design Roadmap (0 → Monster)
SYSTEM DESIGN
│
┌──────────────────┴──────────────────┐
│ │
LLD HLD
│ │
└──────────────┬──────────────────────┘
│
Distributed Systems
│
Real World Architectures
│
Top Company Interviews
📚 PHASE 0 — Prerequisites
Before learning System Design, you should know:
Programming
- Variables
- Functions
- Loops
- OOP
- Exception Handling
Data Structures
- Array
- Linked List
- Stack
- Queue
- Tree
- Graph
- Heap
- HashMap
Algorithms
- Sorting
- Searching
- BFS
- DFS
- Dynamic Programming (Basic)
- Greedy
Database Basics
Learn:
- SQL
- NoSQL
- Primary Key
- Foreign Key
- Index
- Joins
- Transactions
Networking Basics
- HTTP
- HTTPS
- REST API
- TCP
- UDP
- IP Address
- Port
- DNS
📖 PHASE 1 — System Design Fundamentals
This is the foundation.
Without this, nothing will make sense.
Chapter 1
Introduction to System Design
- What is System Design
- Why learn System Design
- DSA vs System Design
- Client Server Architecture
- Real World Examples
Chapter 2
How Internet Works
Browser
│
DNS
│
Load Balancer
│
Server
│
Database
Topics
- Browser
- Client
- DNS
- IP Address
- Server
- Database
Chapter 3
Scalability
Topics
- Vertical Scaling
- Horizontal Scaling
- Peak Hours
- Traffic
- Resources
Chapter 4
Availability
Topics
- Downtime
- High Availability
- Redundancy
- Failover
Chapter 5
Single Point of Failure
Restaurant Example
One Chef ❌
One Server ❌
One Database ❌
Solutions
- Backup
- Replication
- Multiple Servers
📖 PHASE 2 — Core Components
Now start learning the building blocks.
Load Balancer
Learn
- Round Robin
- Least Connection
- Health Check
- Reverse Proxy
Diagram
Users
│
Load Balancer
│
──────────────
│ │ │
S1 S2 S3
Database
Learn
SQL
- PostgreSQL
- MySQL
NoSQL
- MongoDB
- Cassandra
Topics
- Index
- Transactions
- Sharding
- Replication
Cache
Topics
- Redis
- Memcached
- Cache Aside
- Write Through
- Write Back
- TTL
Diagram
User
↓
Server
↓
Redis
↓
Database
Queue
Topics
- RabbitMQ
- Kafka
- SQS
Learn
- Producer
- Consumer
- Dead Letter Queue
- Retry
CDN
Topics
- Static Assets
- Edge Server
- Global Delivery
Storage
Learn
- Object Storage
- File Storage
- Blob Storage
Example
Amazon S3
Search Engine
Topics
- Elasticsearch
- OpenSearch
API Gateway
Topics
- Authentication
- Rate Limiting
- Routing
📖 PHASE 3 — Database Design
Topics
ER Diagram
Normalization
Denormalization
Indexes
Partitioning
Replication
CAP Theorem
ACID
BASE
Consistency
Availability
Partition Tolerance
📖 PHASE 4 — Low Level Design (LLD)
Now start object-oriented design.
OOP Revision
- Class
- Object
- Encapsulation
- Inheritance
- Abstraction
- Polymorphism
SOLID Principles
- S
- O
- L
- I
- D
Design Principles
- DRY
- KISS
- YAGNI
UML Diagrams
- Class Diagram
- Sequence Diagram
- Activity Diagram
- State Diagram
Design Patterns
Creational
- Singleton
- Factory
- Builder
- Prototype
Structural
- Adapter
- Facade
- Decorator
- Composite
- Proxy
Behavioral
- Strategy
- Observer
- Command
- State
- Iterator
- Chain of Responsibility
LLD Problems
Design
- Parking Lot
- ATM
- Library
- Hotel
- Cab Booking
- Elevator
- Snake Game
- Chess
- Cricbuzz
- Splitwise
- Vending Machine
📖 PHASE 5 — High Level Design (HLD)
Now architecture.
Topics
Scalability
Availability
Reliability
Maintainability
Fault Tolerance
Performance
Latency
Throughput
Consistency
Durability
Architecture
Monolith
Microservices
Serverless
Event Driven
Layered Architecture
Hexagonal Architecture
Clean Architecture
Communication
REST
GraphQL
gRPC
WebSocket
Message Queue
Deployment
Docker
Kubernetes
Nginx
CI/CD
Blue Green Deployment
Canary Deployment
Rolling Update
Observability
Logging
Monitoring
Tracing
Metrics
Alerting
Security
JWT
OAuth
Rate Limiting
API Gateway
Encryption
HTTPS
CORS
CSRF
XSS
SQL Injection
📖 PHASE 6 — Distributed Systems
This is where most interviews happen.
Topics
Replication
Master Slave
Leader Follower
Leader Election
Consensus
Paxos
Raft
ZooKeeper
Sharding
Horizontal Partitioning
Vertical Partitioning
Hash Based Sharding
Range Based Sharding
CAP Theorem
Consistency
Availability
Partition Tolerance
Distributed Cache
Redis Cluster
Distributed Lock
Redis Lock
ZooKeeper Lock
Event Driven Architecture
Producer
Consumer
Queue
Retry
DLQ
Streaming
Kafka
Pulsar
Event Streaming
📖 PHASE 7 — Cloud
AWS
Azure
Google Cloud
Learn
EC2
S3
Lambda
CloudFront
RDS
DynamoDB
EKS
ECS
IAM
VPC
CloudWatch
📖 PHASE 8 — DevOps
Git
GitHub
Docker
Docker Compose
Linux
Nginx
CI/CD
GitHub Actions
Terraform (Optional)
📖 PHASE 9 — Real World Architectures
Design these systems.
Easy
✅ URL Shortener
✅ Pastebin
✅ TinyURL
Medium
✅ Chat Application
✅ Food Delivery
✅ Cab Booking
✅ Hotel Booking
✅ Instagram Feed
✅ Notification Service
Advanced
✅ YouTube
✅ Netflix
✅ Google Drive
✅ Dropbox
✅ Uber
✅ Google Maps
✅ Twitter/X
✅ Discord
✅ Zoom
Monster
✅ Amazon
✅ Google Search
✅ Payment Gateway
✅ Banking System
✅ Kubernetes Control Plane
📖 PHASE 10 — Interview Preparation
Top interview questions.
Design
- TinyURL
- YouTube
- Uber
- BookMyShow
- Paytm
- Google Drive
- Dropbox
- Notification System
- Rate Limiter
- API Gateway
- Distributed Cache
- Messaging Queue
📖 PHASE 11 — Become a Monster
Read production-level topics.
- Event Sourcing
- CQRS
- Saga Pattern
- Outbox Pattern
- Idempotency
- Circuit Breaker
- Bulkhead Pattern
- Service Mesh
- Kubernetes
- Multi Region Deployment
- Disaster Recovery
- Zero Downtime Deployment
- Blue Green Deployment
- Canary Deployment
- Feature Flags
🎯 Complete Learning Path (Visual Roadmap)
SYSTEM DESIGN
│
┌────────────┴────────────┐
│ │
Fundamentals Networking
│ │
└────────────┬────────────┘
│
Core Components
│
┌──────────────┬────────────┬─────────────┐
│ │ │ │
Database Cache Queue Load Balancer
│ │ │ │
└──────────────┴────────────┴─────────────┘
│
Database Design
│
Low Level Design
│
Design Patterns
│
Object-Oriented Design
│
High Level Design
│
Distributed Systems
│
Cloud + DevOps + Security
│
Real World System Design
│
FAANG Interview Preparation
│
Senior Engineer
│
Staff Engineer
│
Software Architect
📚 If You Want to Write the "World's Best System Design Notes"
I recommend organizing the notes into 30 sequential chapters, moving from beginner to advanced:
| Chapter | Topic |
|---|---|
| 1 | Introduction to System Design |
| 2 | How the Internet Works |
| 3 | Networking Fundamentals |
| 4 | Scalability |
| 5 | Load Balancers |
| 6 | Databases |
| 7 | Database Indexing & Query Optimization |
| 8 | Caching |
| 9 | Message Queues |
| 10 | Distributed Systems |
| 11 | CAP Theorem & Consistency |
| 12 | Storage Systems |
| 13 | API Design |
| 14 | Authentication & Authorization |
| 15 | Low-Level Design (LLD) |
| 16 | SOLID Principles |
| 17 | Design Patterns |
| 18 | UML & Object Modeling |
| 19 | High-Level Design (HLD) |
| 20 | Microservices |
| 21 | Event-Driven Architecture |
| 22 | Logging, Monitoring & Observability |
| 23 | Docker & Kubernetes |
| 24 | Cloud Architecture |
| 25 | Security in Distributed Systems |
| 26 | Reliability & Fault Tolerance |
| 27 | Performance Optimization |
| 28 | Real-World Case Studies (Netflix, WhatsApp, YouTube, Uber, etc.) |
| 29 | Top Product-Based Company Interview Questions |
| 30 | Complete System Design Interview Playbook & Revision Notes |
This progression mirrors how experienced engineers learn: fundamentals first, then components, then design principles, followed by architecture, distributed systems, cloud, and finally real-world interview problems. It builds a strong foundation instead of memorizing solutions.
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