DSA + LLD + HLD + Java Backend Mock Interview with Rahul Kumar

A realistic mock interview covering DSA, Java, Backend Engineering, Low-Level Design (LLD), High-Level Design (HLD), and System Design.

The interview will be tailored to your experience level, target role, and preparation goals.

Depending on the session, questions may cover:

🧠 DSA & Problem Solving

Arrays, Strings, Linked Lists, Trees, Graphs, Recursion, Dynamic Programming, Sliding Window, Binary Search, and complexity analysis

☕ Core Java

OOP, Collections, Generics, Exception Handling, Multithreading, Concurrency, JVM, Memory Management, Streams, and Java 8+

🌱 Spring Boot & Backend Engineering

Spring Core, REST APIs, Microservices, Dependency Injection, Security basics, Exception Handling, Database Integration, and Production Best Practices

🗄️ Database & Caching

SQL, indexing, transactions, normalization, database design, Redis, caching strategies, and consistency

🏗️ Low-Level Design (LLD)

Classes, interfaces, SOLID principles, design patterns, object relationships, extensibility, and clean code

🌐 High-Level Design (HLD) / System Design

Requirement analysis, APIs, databases, caching, load balancing, queues, scalability, availability, partitioning, reliability, and distributed-system trade-offs

🔥 Real-World Backend Scenarios

Debugging, troubleshooting, performance bottlenecks, concurrency issues, scalability problems, and production incidents

🎯 Project Deep Dive

Architecture decisions, design choices, challenges, optimizations, trade-offs, and your contribution

After the interview, you’ll receive detailed feedback on:

✅ Technical strengths

✅ Knowledge gaps

✅ Problem-solving approach

✅ System Design thinking

✅ Communication and answer structure

✅ Interview readiness

✅ A clear improvement roadmap

Suitable for SDE, SDE2, SDE3, Backend Engineer, Java Developer, and Senior Software Engineer roles.