Good experience!!! Lot to learn, but not hard. Concentrate on Maths, Data Structures, OOD, Programming Concepts (any two of Java, JavaScript, Matlab, C++, C), and OS. Totally 6 rounds, but I was rejected in the third round. The interview was scheduled conveniently.

Round 1: Video Interview

Most of the questions are available in Glassdoor.

Round 2: Online Coding Challenge

Choose any two of the mentioned programming languages: Java, C++, C, Matlab, JavaScript. I chose Java and C++.

Questions covered: String reversing, Printing the largest value from a HashMap, and OOPs concepts.

Round 3: Technical Phone Interview - 45-50 Minutes

Java: Prepare for 'what and why' type questions.

• Why Java Generics?
• Code Snippet: Polymorphism
• Code Snippet: Typecasting
• Code Snippet: Inheritance
• Multithreading
• Questions from the online coding challenge regarding how to improve given solutions.
• Predict the output of code snippets.

JavaScript: Prepare for 'what and why' type questions.

• Predict the output of code snippets.
• Undefined value
• Difference between null and null?
• Questions on console.log();

Object-Oriented Design (OOD):

• Explain MVC? Explain with an example.
• How would you draw a class diagram for a scenario? (This question differs for every candidate, so prepare accordingly.)

Operating Systems (OS):

• Semaphore vs. Mutex
• Deadlock
• Process

Mathematics (Math):

• Matrix multiplication
• Inverse
• Eigenvalue & Eigenvector
• Derive a differential equation
• First-order and second-order differential equations.

All the best.