Content

Jun 8, 2025

Java

Topic	Link
Interview	https://suchismita-deb.github.io/tags/interviewquestion/
Java	https://suchismita-deb.github.io/tags/java/
Git	https://suchismita-deb.github.io/tags/git/

Spring

Topic	Link
Spring	https://suchismita-deb.github.io/tags/spring/
Redis	https://suchismita-deb.github.io/tags/redis/
Crud	https://suchismita-deb.github.io/tags/crud/
Rest	https://suchismita-deb.github.io/tags/rest/
JDBC	https://suchismita-deb.github.io/tags/jdbc/
Spring Boot Course	https://suchismita-deb.github.io/tags/springbootcourse/
Spring Security	https://suchismita-deb.github.io/tags/spring-security/

System Design

Topic	Link
Computer Network	https://suchismita-deb.github.io/tags/computer-networks/

Design Pattern

Topic	Link

DSA

Topic	Link
Bit Manipulation	https://suchismita-deb.github.io/tags/dsa/

Behavioral Interview

Topic	Link
Behavioral Interview	https://suchismita-deb.github.io/tags/behavoiral-interview/

Collection of Books.

Book Name	Link.
System Design Handbook.	Link
OS Notes	Link.
Grokking the advanced System Design Interview.	Link.
Grokking the system design interview.	Link.
System Design Insider Guide Alex Xu Book 1 - 100.	Link.
System Design Insider Guide Alex Xu Book 100 - 200.	Link.
System Design Insider Guide Alex Xu Book 200 - 500.	Link.

Self Improvement Books.	Link
Jonathan Livingston Seagull.	Link.
Deep Work_ Rules for focused success in a distracted world.	Link.
Eric-Jorgenson_The-Almanack-of-Naval-Ravikant_Final.	Link.
GM-The-Secret-LOA-Power-of-Intention-eBook	Link.
How-To-Win-Friends	Link.
Atomic Habits	Link.

System Design. https://github.com/SweetCodey/system-design-masterclass/tree/main

Java Interview Question.

Grilled on OOPs
String concatenation
Operator precedence
memory model
multithreading
garbage collection
concurrent data structures
design patterns
simple questions on DBMS
HLD concepts
Springboot annotations.

Difference between mutex and semaphore
What is sleep and wait in Java
Optimistic locking vs pessimistic locking
What is tomcat server?
How LSI and GSI work in dynamodb?
Why protobuf was used for serialization?
What protocol are we using to communicate?
How HTTPS works?

Core Java & Data Structures.
Explain the internal working of ConcurrentHashMap.
How does it achieve thread safety, and what are its performance trade-offs?
Describe the differences between WeakHashMap and HashMap. When would you use each? Given a large dataset (millions of records), how would you efficiently search for duplicate transactions?
How does the Java Memory Model impact multi-threaded applications?
Design an in-memory key-value store that supports TTL (time to live) for entries.

Multithreading & Concurrency.
How would you design a thread pool from scratch?
Explain how Java handles false sharing in multi-core processors.
What are the main drawbacks of using synchronized methods? How does ReentrantLock improve performance?
Implement a multi-threaded rate limiter that handles API requests.
How would you handle thread starvation in high-throughput applications?

Spring Boot & Microservices.
How does Spring Boot’s auto-configuration determine which beans to load?
What is Circuit Breaker, and how does it prevent cascading failures in microservices?
How would you handle blue-green deployments in a Spring Boot microservices setup?
Explain Eventual Consistency. How would you ensure data consistency across distributed services?
Implement a rate-limited API in Spring Boot that handles 10,000 requests per second.

APIs & RESTful Services.
How would you design an API Gateway to handle dynamic routing and security policies?
Explain the challenges of handling pagination in REST APIs for massive datasets.
How would you manage API timeouts and retries in a distributed system?
What’s the best way to implement WebSockets in a fintech application?
How would you enforce idempotency in payment APIs?

System Design Basics.
How would you ensure data integrity in a multi-region database setup?
Explain Leader Election. How would you implement it in a microservices-based system?
What are the trade-offs between CQRS and traditional CRUD-based systems?
How does a Distributed Message Queue (like Kafka) handle backpressure?

System Design Chart.

Level	Topic HLD	Status
Medium	Design a high-throughput, low-latency stock exchange.	Todo.
Easy	Design a URL shortener (like Bit.ly)	Todo.
Easy	Design a distributed rate limiter.	Todo.
Easy	Design a key-value store (like Redis).	Todo.
Easy	Design a global notification system.	Todo.
Easy	Design a load balancer.	Todo.
Easy	Design a scalable search engine.	Todo.
Easy	Design a messaging queue (like Kafka).	Todo.
Easy	Design a sharding strategy for a database.	Todo.
Easy	Design an API Gateway.	Todo.
Easy	Design a real-time chat application (like WhatsApp).	Todo.
Easy	Design a distributed file storage system (like Google Drive).	Todo.
Easy	Design a content delivery network (CDN).	Todo.
Easy	Design a ride-sharing service (like Uber).	Todo.
Easy	Design a Youtube.	Todo.
Easy	Design a Amazon.	Todo.
Medium	Uber	Todo.
Easy	Design a Digital Wallet.	Todo.
Easy	Design bulk file processing system.	Todo.
Easy	Design promotional notification system.	Todo.

Level	Topic LLD	Status
Easy	Tic Tac Toe Game.	Todo.
Easy	Parking Lot.	Todo.
Easy	ATM.	Todo.
Easy	Snake Game.	Todo.
Easy	Loggin System.	Todo.
Easy	Hashmap Internals.	Todo.
Easy	Book My Show.	Todo.
Easy	Splitwise.	Todo.
Easy	Chess Game.	Todo.
Easy	File Systems.	Todo.
Easy	Message Queue.	Todo.
Easy	Inventory Management System.	Todo.
Easy	Library Management System.	Todo.
Easy	Calendar.	Todo.
Easy	Stack Overflow.	Todo.