Western Digital Senior Software Engineer Interview Questions and Answers for Experienced

Q1. Core Java and Spring boot questions
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Q2. Hibernate, Spring, Junit, Mockito and Micro service questions
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Q3. Difference between String and StringBuffer
Ans. 
String is immutable while StringBuffer is mutable.
• StringBuffer is faster for concatenation operations.

• StringBuffer has methods to modify the string.

• StringBuffer is thread-safe while String is not.

• StringBuffer has a larger memory footprint than String.
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Q1. Internal Structure of hashmap and hashing algorithm
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Explanation of internal structure of hashmap and hashing algorithm
• Hashmap is a data structure that stores key-value pairs using a hash function

• Hashing algorithm converts the key into an index in the array

• Collisions can occur when two keys map to the same index

• Chaining and open addressing are two methods to handle collisions

• Load factor determines when to resize the hashmap
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Q2. Difference between predicate and supplier
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Predicate is a functional interface that takes an argument and returns a boolean value. Supplier is a functional interface that takes no argument and returns a value.
• Predicate is used for filtering or testing a condition on an object.

• Supplier is used for providing a value or generating a value.

• Predicate takes an argument and returns a boolean value based on the condition.

• Supplier takes no argument and returns a value.

• E...read more
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It had aptitude questions related tk dsa, dbms and os.

There were 3 coding question with different leetcode level. (Medium, medium. Hard(

Q1. Regarding Operating System
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Q2. Regarding OOPS(Abstraction)
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Q3. Bitwise related questions
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Q4. Linked list related questions
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Q1. Questions related to computer network
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Q2. Graph related question like bfs and dfs
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Q1. Why you want to join the company?
Ans. 
I am impressed by the company's innovative projects and collaborative work culture.
• Impressed by innovative projects

• Attracted to collaborative work culture

• Excited about potential for growth and learning opportunities
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Q2. What is the expectations from the company?
Ans. 
The company expects a Senior Software Engineer to have strong technical skills, problem-solving abilities, teamwork, and a commitment to continuous learning.
• Strong technical skills in programming languages and software development tools

• Ability to solve complex problems efficiently and effectively

• Collaboration and teamwork with other team members

• Commitment to continuous learning and staying updated with industry trends

• E...read more
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3 hrs test with 50 test cases to run

Q1. Basic Trees and Project Quesions
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Q1. Normal HR questions and one technical question
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Q1. Previous role related technical questions
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Q1. Same as round 1 from onsite team
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Q1. General HR questions
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Q1. Cursor and refcursor
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Q1. Oracle database developer related questions
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Q1. What is pep and why its important
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Q1. Dependency injection in .Net
Ans. 
Dependency Injection in .NET is a design pattern that promotes loose coupling and enhances testability by injecting dependencies.
• Promotes loose coupling by separating the creation of an object from its usage.

• Facilitates easier unit testing by allowing mock dependencies to be injected.

• Commonly used with interfaces to define contracts for services.

• Example: Using constructor injection to provide a service to a controller ...read more
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Q2. Design patterns and solid principles
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Q1. What are oops concepts
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