Status: IN3, Walmart Global Tech, Bengaluru - 6yrs overall experience
Position: Senior Software Developer at EPAM
Location: Hyderabad, India
Date: Dec, 2023

Round 1:

Introduction:

Gave a brief introduction about my experiences.

Java-Related Questions:

• JVM, Heap memory, and Stack memory
• Runtime polymorphism
• Hierarchy of the collection framework
• Difference between a Map and TreeSet, internal working of HashMap
• Immutability of strings in Java, difference between StringBuffer and StringBuilder
• Streams and filters (though no further questions as I wasn't familiar with them)
• Functional interfaces
• SOLID Principles, particularly the Liskov substitution principle
• Data structures in used in code
• Multi-threading and ExecutorService
• Adapter pattern
• Builder pattern
• Asked about why we were using Camunda workflows and if we had evaluted other options like Netflix conductor
• Reason for using Cosmos DB

DSA Questions:

1. Combination Sum-like problem: Instead of candidates, the number K was given, and all numbers from 1 through K were candidates. Similar to: Combination Sum
2. All Nodes Distance K in Binary Tree: Provided a graph-based approach which was correct, but the interviewer wanted another approach. Most time was spent on the first question, so didn't get to code this.

Verdict :

No update from HR.