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

Описание: 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

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#LLD #SystemDesign #Java #DesignPatterns #COR #Strategy #Singleton #LoggingSystem #InterviewPreparation