⚡ BY: Bharadwaj — Code With Bharadwaj ⚡
🎯 50 Production-Ready LLD Solutions | 🐍 Python + ☕ Java | 🔥 Interview-Focused | ⚙️ UML Thinking | 🛠 OOP + Design Patterns
This repository is a power-packed, interview-ready, enterprise-grade Low-Level Design (LLD) arsenal containing 50 real-world system design problems, each solved in both Python and Java.
These are not just examples — these are high-quality LLD implementations that demonstrate how real engineers structure real systems.
If you're preparing for FAANG, top startups, system design rounds, SDE-2 promotions, or creating LLD content, this repo is your secret weapon. 💣⚡
This is the only repo you need to master Low-Level Design.
System Design Theory PDF : Credit -> Interview Bit
| # | LLD Problem Name |
|---|---|
| 01 | Design a Rate Limiter |
| 02 | Design a Load Balancer System |
| 03 | Design a Logger System |
| 04 | Design a URL Shortener (Bit.ly) |
| 05 | Design a Unique ID Generator |
| 06 | Design a Parking Lot System |
| 07 | Design a Vending Machine |
| 08 | Design a Traffic Control System |
| 09 | Design an ATM Machine |
| 10 | Design a Chess Game |
| 11 | Design an Elevator System |
| 12 | Design a Library Management System |
| 13 | Design a Calendar / Booking Scheduler |
| 14 | Design an Online Text Editor |
| 15 | Design a Restaurant Order Management System |
| 16 | Design a Distributed Lock Manager (DLM) |
| 17 | Design an In-Memory Cache |
| 18 | Design a Generic Notification System |
| 19 | Design File Upload Utility |
| 20 | Design a Payment Gateway Integration |
| 21 | Design a Form Validator |
| 22 | Design a Search Indexer |
| 23 | Design an Authentication System |
| 24 | Design a Permission & Role Management System |
| 25 | Design a Multi-Factor Authentication (MFA) System |
| 26 | Design a Password Vault System |
| 27 | Design an E-Commerce Shopping Cart System |
| 28 | Design a Product Review System |
| 29 | Design a Movie / Video Streaming System |
| 30 | Design a Booking / Reservation System |
| 31 | Design a Coupon / Discount Manager |
| 32 | Design an Auction System |
| 33 | Design an Inventory Management System |
| 34 | Design a Loyalty Program |
| 35 | Design a Shipping & Logistics System |
| 36 | Design a Subscription Manager |
| 37 | Design a Distributed Counter |
| 38 | Design a Health Monitoring System |
| 39 | Design a Circuit Breaker |
| 40 | Design a Workflow System |
| 41 | Design a Bulk Data Importer |
| 42 | Design Undo / Redo Functionality |
| 43 | Design Search Suggestion / Autocomplete |
| 44 | Design a Dependency Injection Container |
| 45 | Design a Geo-Location Service |
| 46 | Design a Job Queue Processor |
| 47 | Design a Code Compiler Service |
| 48 | Design a Dynamic Feature Flag Manager |
| 49 | Design a Configuration Manager |
| 50 | Design a Tic-Tac-Toe Game |
- 💼 Covers 90% of LLD interview questions
- 🎓 Explained in simple yet scalable architecture
- 🧠 Ideal for mock interviews and YouTube teaching
- 🧰 Reusable templates for actual production apps
- 🏢 Follows enterprise-grade OOP and SOLID principles
- ⚡ Both Python & Java versions included for every single problem
- SDE-1 → SDE-2 upskillers
- Developers preparing for FAANG
- Students learning OOP & system design
- YouTubers & educators
- Engineers designing microservices
- Anyone who wants to think like an architect
If this helped you:
- ⭐ Star this repo
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Bharadwaj
🚀 GitHub: https://github.com/Manu577228
🔥 YouTube: https://youtube.com/@code-with-Bharadwaj
This repo is not just another GitHub project.
It’s a complete LLD powerhouse, a learning kit, a career booster, and a content goldmine.
If you're serious about mastering Low-Level Design, this repository is your launchpad.
Let’s build, scale, and design like world-class engineers. 🚀🔥