Advanced
• Time yourself: aim for 20-30 min per medium problem
• Practice explaining solutions out loud
Week 1-3: Master Core Patterns
Two Pointers & Sliding Window
• 3Sum, 4Sum variations
• Minimum Window Substring
• Longest Substring Without Repeating
• Trapping Rain Water
• Minimum Window Substring
• Longest Substring Without Repeating
• Trapping Rain Water
Advanced Tree Problems
• Serialize/Deserialize Binary Tree
• Lowest Common Ancestor variants
• Binary Tree Maximum Path Sum
• Construct Tree from traversals
• Lowest Common Ancestor variants
• Binary Tree Maximum Path Sum
• Construct Tree from traversals
Graph Algorithms
• Dijkstra's Algorithm
• Union Find (Disjoint Set)
• Topological Sort
• Strongly Connected Components
• Union Find (Disjoint Set)
• Topological Sort
• Strongly Connected Components
💡 Pro Tips
• Solve 5-7 problems daily, focus on pattern recognition• Time yourself: aim for 20-30 min per medium problem
• Practice explaining solutions out loud
Expert
Week 4-5: Dynamic Programming Mastery
Advanced DP Patterns
• Interval DP (Burst Balloons)
• Bitmask DP
• DP on Trees
• State Machine DP
• Bitmask DP
• DP on Trees
• State Machine DP
Game Theory & Minimax
• Stone Game variations
• Predict the Winner
• Optimal Strategy problems
• Predict the Winner
• Optimal Strategy problems
Expert
Week 6: Advanced Data Structures
Segment Trees & Fenwick Trees
• Range Sum/Min/Max queries
• Lazy propagation
• 2D range queries
• Lazy propagation
• 2D range queries
Advanced Heaps
• Median from Data Stream
• Merge K Sorted Lists
• Top K Frequent Elements variants
• Merge K Sorted Lists
• Top K Frequent Elements variants
Intermediate
Week 3-4: Design Patterns Deep Dive
Creational Patterns
• Factory & Abstract Factory
• Builder Pattern (complex objects)
• Prototype Pattern
• Singleton (thread-safe implementations)
• Builder Pattern (complex objects)
• Prototype Pattern
• Singleton (thread-safe implementations)
Behavioral Patterns
• Observer Pattern
• Command Pattern
• Strategy Pattern
• State Machine Pattern
• Command Pattern
• Strategy Pattern
• State Machine Pattern
Advanced
• Draw class diagrams and relationships
• Discuss trade-offs and extensibility
• Code key classes with proper OOP principles
Week 5-6: System Design Practice
Classic LLD Problems
• Design Parking Lot
• Design Chess Game
• Design Movie Ticket Booking
• Design Elevator System
• Design Chess Game
• Design Movie Ticket Booking
• Design Elevator System
Modern App Designs
• Design Uber/Ola
• Design Food Delivery App
• Design Chat Application
• Design Social Media Feed
• Design Food Delivery App
• Design Chat Application
• Design Social Media Feed
🎯 LLD Interview Strategy
• Start with use cases and requirements• Draw class diagrams and relationships
• Discuss trade-offs and extensibility
• Code key classes with proper OOP principles
Intermediate
Week 7-8: Scalability Fundamentals
Database Design
• SQL vs NoSQL trade-offs
• Database sharding strategies
• Read replicas and master-slave
• ACID properties and CAP theorem
• Database sharding strategies
• Read replicas and master-slave
• ACID properties and CAP theorem
Caching Strategies
• Redis/Memcached patterns
• Cache eviction policies
• Distributed caching
• CDN and edge caching
• Cache eviction policies
• Distributed caching
• CDN and edge caching
Message Queues
• Kafka, RabbitMQ, SQS
• Pub/Sub patterns
• Event-driven architecture
• Dead letter queues
• Pub/Sub patterns
• Event-driven architecture
• Dead letter queues
Advanced
• Estimate scale (users, data, QPS)
• High-level architecture first
• Deep dive into components
• Address bottlenecks and scaling
Week 9-10: Large Scale Systems
System Design Classics
• Design URL Shortener (Bitly)
• Design Social Media (Twitter)
• Design Video Streaming (YouTube)
• Design Search Engine (Google)
• Design Social Media (Twitter)
• Design Video Streaming (YouTube)
• Design Search Engine (Google)
Advanced Concepts
• Microservices architecture
• Load balancing strategies
• Consistent hashing
• Service discovery
• Load balancing strategies
• Consistent hashing
• Service discovery
🏗️ HLD Interview Framework
• Clarify requirements (functional/non-functional)• Estimate scale (users, data, QPS)
• High-level architecture first
• Deep dive into components
• Address bottlenecks and scaling
Intermediate
Week 2-4: Advanced Java Concepts
Concurrency & Multithreading
• Thread pools and Executors
• CompletableFuture
• Locks and Synchronization
• Producer-Consumer patterns
• CompletableFuture
• Locks and Synchronization
• Producer-Consumer patterns
JVM Internals
• Memory model and GC
• Heap vs Stack
• ClassLoader mechanism
• JVM tuning parameters
• Heap vs Stack
• ClassLoader mechanism
• JVM tuning parameters
Collections Framework
• HashMap internals
• ConcurrentHashMap
• Custom comparators
• Stream API advanced usage
• ConcurrentHashMap
• Custom comparators
• Stream API advanced usage
Intermediate
Week 8-10: Spring Boot Mastery
Advanced Spring Concepts
• Custom annotations
• AOP (Aspect-Oriented Programming)
• Spring Security deep dive
• Transaction management
• AOP (Aspect-Oriented Programming)
• Spring Security deep dive
• Transaction management
Microservices with Spring
• Spring Cloud Gateway
• Service discovery (Eureka)
• Circuit breaker patterns
• Distributed tracing
• Service discovery (Eureka)
• Circuit breaker patterns
• Distributed tracing
Testing & Performance
• Integration testing strategies
• Mock vs Spy
• Performance monitoring
• Caching with Spring
• Mock vs Spy
• Performance monitoring
• Caching with Spring
🗓️ 12-Week Master Plan
Weeks 1-3: DSA Core Patterns + Java Fundamentals
Weeks 4-5: Advanced DP + LLD Design Patterns
Weeks 6-7: Advanced Data Structures + HLD Basics
Weeks 8-9: Spring Boot Advanced + System Design Practice
Weeks 10-11: Mock Interviews + Weak Area Focus
Week 12: Final Revision + Interview Strategy
📊 Overall Progress
0% Complete - Let's get started! 🚀
🎯 Weekly Goals
• DSA: 40-50 problems per week• System Design: 2-3 complete designs per week
• Java/Spring: Build 1 project showcasing advanced concepts
• Mock Interviews: 2-3 sessions per week in final month