Visual Cheat Sheets
High-density visual references for System Design, OOP, and Architecture. Perfect for quick revision before interviews.
Database Transactions
Visual guide to ACID, Isolation Levels, Anomalies, and Concurrency Control.
Event-Driven Architecture
Visual guide to Async patterns, Pub-Sub, Message Queues, and Event Sourcing.
Rate Limiting
Visual guide to Token Bucket, Leaky Bucket, Fixed Window, and Sliding Window algorithms.
Caching Strategies
Visual guide to Cache-Aside, Write-Through, Write-Back, and Eviction policies.
Synchronization Primitives
Visualizing locks, semaphores, and barriers for thread safety.
Class Relationships
Mastering Association, Aggregation, Composition, and Inheritance with UML.
LLD Interview Framework
The definitive step-by-step mental model for cracking machine coding rounds.
Approaching LLD Interview
A step-by-step workflow to tackle any Low-Level Design interview problem.
OOP Concepts Cheat Sheet
Quick reference for Encapsulation, Inheritance, Polymorphism, and Abstraction.
Design Principles (Beyond SOLID)
DRY, KISS, YAGNI, and other essential principles for clean architecture.
Design Patterns Cheat Sheet
Visual guide to Creational, Structural, and Behavioral design patterns.
SOLID Principles Cheat Sheet
The 5 commandments of object-oriented design explained visually.
Python OOP Cheat Sheet
Python-specific OOP features, dunder methods, and idioms.
Java OOP Cheat Sheet
Java syntax, interfaces, abstract classes, and memory model.
Sequence Diagram Notation
Master the syntax of sequence diagrams for system interactions.
State Machine Diagram
How to model complex state transitions and events.
Data Structures Cheat Sheet
Time complexities and use cases for common data structures.
Database Schema Design
Best practices for normalization, indexing, and relationships.
HTTP Status Codes
Quick reference for 2xx, 3xx, 4xx, and 5xx status codes.
Error Handling Cheat Sheet
Patterns for graceful error handling and propagation.