Design Logging System | Amazon LLD Interview Question | Java Code Walkthrough (with Debugger)

In this video, I deep dive into the Low-Level Design of a Logging System, a common LLD interview question. This question was asked to one of my friends few days back (September 2025) in an Amazon interview for an SDE-2 position. Also, it is a commonly asked question in Microsoft LLD rounds. We’ll cover: ✅ Functional Requirements ✅ Design Patterns (COR, Strategy, Singleton) ✅ Entities & UML Class Diagram ✅ Complete Java Code Implementation ✅ Step-by-step code flow walkthrough using the Debugger You’ll see how the Chain of Responsibility pattern helps in handling log levels, and how the Singleton pattern ensures a single Logger instance across threads. If you’re preparing for system design or LLD interviews at top companies, this walkthrough will help you understand: How to gather requirements and map them to patterns How to design extensible and thread-safe systems How to implement and debug a real-world LLD problem in Java 🔔 Don’t forget to like & subscribe for more LLD + HLD + DSA interview prep content! 🔧 My Tech Gear & Setup 💻 Laptop: Dell Inspiron 15 3000 📱 Phone: https://amzn.to/4qzWrQT 🎧 Headphones: https://amzn.to/4qCwWON ⌨️ Keyboard: https://amzn.to/45lHSIo 🖱️ Mouse: https://amzn.to/45lHSIo 📷 Mic: https://amzn.to/45sGlAj ⌚️ Smartwatch: https://amzn.to/4bfF2IF 🖥️ Monitor: https://amzn.to/4aAZOSR #LLD #SystemDesign #Java #DesignPatterns #COR #Strategy #Singleton #LoggingSystem #InterviewPreparation