Helping Engineers Master Low Level Design
Low Level Design Mastery is a structured learning platform built for software engineers who want to deeply understand object-oriented design, write better code, and ace LLD interviews at top tech companies.
Our Mission
Most engineers learn design patterns by memorizing code. We believe the real skill is understanding why — why a pattern exists, when to use it, and what trade-offs it makes.
Our platform combines clear theory, visual UML diagrams, side-by-side code in 6 languages, and an interactive playground with AI-powered feedback — so you don't just read about design, you practice it.
Whether you're preparing for a machine coding round at Google, Amazon, or a startup, or just want to write cleaner, more maintainable code — this platform is built for you.
What We Cover
A complete curriculum from OOP fundamentals to advanced interview case studies, with solutions in Python, Java, JavaScript, TypeScript, C++, C#.
OOPS Refresher
Classes, Enums, Inheritance, Interfaces, Polymorphism & more
Class Relationships
Association, Aggregation, Composition, Dependency
Design Principles
DRY, YAGNI, KISS and all 5 SOLID Principles
Design Patterns
20+ Creational, Structural & Behavioral patterns
Advanced Concurrency
Threads, synchronization, thread pools, lock-free programming
Interview Guide
40+ real LLD case studies from Easy to Hard
HLD Concepts Bonus
Scalability, caching, databases, microservices & more
Interactive Playground
UML builder, AI feedback, and solutions in 6 languages
Who This Is For
Interview Preparation
Engineers preparing for machine coding / LLD rounds at FAANG, unicorn startups, or product companies.
Working Engineers
Developers who want to write cleaner, more maintainable code and understand design trade-offs better.
CS Students
Students bridging the gap between academic theory and what's actually asked in software engineering interviews.
About the Creator
Vishnu Darshan Sanku
Backend Engineer · Creator of LowLevelDesignMastery
Vishnu is a backend engineer with hands-on experience building scalable systems. After going through countless LLD interviews himself, he noticed that most resources either focused purely on theory or gave copy-paste solutions without explaining the reasoning behind them.
He built Low Level Design Mastery to be the resource he wished he had — one that teaches how to think about design problems, not just what the answer looks like.
Get in Touch
Have a question, found an issue, or want to suggest a topic? We'd love to hear from you.