LLD Case Study Jun 21, 2026
Designing WhatsApp - Low Level Design
Learn how to build a WhatsApp in Java. This walkthrough covers a class diagram, object-oriented design patterns, and complete Java implementation.
Low Level Design
Deep dives into software architecture, design patterns, and OOP principles with comprehensive Java examples.
LLD Case Study Jun 7, 2026
Design an AI Agent Tool Execution Coordinator
Learn how to build an AI Agent Tool Execution Coordinator in Java using the Mediator and Command patterns with agentic loop execution and context window pruning.
LLD Case Study Jun 7, 2026
Design an API Gateway / Reverse Proxy
Learn how to build an API Gateway/Reverse Proxy in Java. Covers a class diagram, object-oriented design patterns and complete Java implementation.
LLD Case Study Jun 7, 2026
Design a Collaborative Real-time Rich-Text Editor (CRDT/OT Engine)
Learn how to build a collaborative real-time rich-text editor in Java. Covers CRDT/OT eventual consistency conflict resolution algorithms.
LLD Case Study Jun 7, 2026
Design a Coupon / Promo Code Validator Service
Learn how to build a Coupon/Promo Code Validator Service in Java using the Strategy pattern and Chain of Responsibility. Includes complete Java code.
LLD Case Study Jun 7, 2026
Design a Multi-Stage Task Scheduler with DAG Execution
Learn how to build a multi-stage task scheduler with Directed Acyclic Graph (DAG) validation, cycle detection, and parallel thread-pool execution in Java.
LLD Case Study Jun 7, 2026
Design a Database Connection Pool (HikariCP style)
Learn how to build a Database Connection Pool in Java. Covers a class diagram, object-oriented design patterns and complete Java implementation.
LLD Case Study Jun 7, 2026
Design an Extensible Dependency Injection (DI) Container
Learn how to design a Dependency Injection (DI) container in Java with bean lifecycle management, recursive reflection resolution, and circular dependency detection.
LLD Case Study Jun 7, 2026
Design a Circuit Breaker
Learn how to build a Circuit Breaker in Java. This walkthrough covers a class diagram, object-oriented design patterns, and complete Java implementation.
LLD Case Study Jun 7, 2026
Design a Load Balancer
Learn how to build a Load Balancer in Java. This walkthrough covers a class diagram, object-oriented design patterns, and complete Java implementation.