Dentsu World Services Senior Software Engineer Interview Questions and Answers

Q1. Basic to medium questions related to DotNet Core MVC, SQL Server, etc
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Q1. Completely unprofessional behavior of the interviewer. - No Introduction Direct start asking questions. - Asking too many misleading questions (First ask what you worked on, then ask did you heard about th...read more
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Duration was 1 hour, Topics covered were DSA, Concurrency in golang, Databse questions

Q1. About the project. and asked what i did in project. how to create schema in pyspark. what is ADE. what are the difficulties i faced in project. what is spark submit command how we write sparksubmit command...read more
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Q2. No of occurrences of letter in a string.
Ans. 
Count occurrences of a letter in a string.
• Iterate through each character in the string and count occurrences of the specified letter.

• Use a hashmap to store the count of each letter.

• Handle both uppercase and lowercase letters to ensure accurate counting.
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There was mcq test with 1 sql code based question.

Q1. It was technical interview of around 30 min, questions were direct and short on react lifecycle and basic concepts of js.
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Q2. What is debounce and throttling?
Ans. 
Debounce and throttling are techniques used in web development to limit the number of times a function is called.
• Debounce delays the execution of a function until after a specified time period has elapsed without additional calls.

• Throttling limits the rate at which a function is called, ensuring it is not called more than once within a specified time interval.

• Debounce is useful for handling events like resizing a windo...read more
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Q3. What is diff between git merge and rebase?
Ans. 
Git merge combines changes from different branches, while rebase moves the current branch to the tip of another branch.
• Merge creates a new commit with combined changes, while rebase rewrites commit history.

• Merge preserves the commit history of both branches, while rebase creates a linear history.

• Merge is non-destructive and suitable for public branches, while rebase is destructive and should be used for private branche...read more
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Q4. What is diff between git fork and clone?
Ans. 
Git fork creates a copy of a repository under your GitHub account, while git clone creates a local copy of a repository.
• Fork creates a copy on GitHub, clone creates a local copy on your machine

• Forking allows you to make changes without affecting the original repository

• Cloning downloads the entire repository to your local machine

• Forking is commonly used for contributing to open source projects
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Q5. What is DOM in react?
Ans. 
DOM in React stands for Document Object Model, representing the structure of a web page as a tree of objects.
• DOM in React is a virtual representation of the actual HTML elements on a web page.

• React uses a virtual DOM to improve performance by updating only the necessary components.

• Changes to the virtual DOM are compared with the real DOM, and only the differences are updated.

• This helps in minimizing the number of DOM m...read more
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Q1. It was based on round 2 but in detail.
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Mixed conceptual questions from java8, Spring Boot and SQL and microservices

Q1. One round technical question and coding on Java, Java 8, Spring boot,Rest webservices, SQL. Code for rest API using jpa for CRUD.
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Q2. Singleton pattern for thread safety .
Ans. 
Singleton pattern ensures only one instance of a class is created and provides a global point of access to it.
• Use lazy initialization to create the instance only when needed.

• Use synchronized keyword to make the getInstance() method thread-safe.

• Consider using double-checked locking for better performance.

• Use enum to implement singleton pattern as it is inherently thread-safe.
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Q3. Linked list implementation
Ans. 
Linked list is a data structure where each element points to the next element in the sequence.
• Nodes contain data and a reference to the next node

• Insertion and deletion can be done efficiently in a linked list

• Traversal starts from the head node and follows the next pointers
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Q1. Parenthesis balancing question
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Q2. Caching in Hibernate
Ans. 
Caching in Hibernate improves performance by storing frequently accessed data in memory.
• Hibernate supports first-level cache at session level

• Second-level cache can be configured at session factory level

• Caching strategies include read-only, read-write, and transactional

• Cache providers like Ehcache, Infinispan, and Hazelcast can be used
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Q3. Maven scope questions
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Q4. Ci and CD concept
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Q1. Salary negotiation
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Q1. SQL query to join 3 tables
Ans. 
Use SQL JOIN to combine data from 3 tables based on a common key.
• Use INNER JOIN, LEFT JOIN, or RIGHT JOIN depending on the desired result

• Specify the columns to select from each table

• Use ON clause to specify the join condition
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Q2. Spring boot annotations
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Q3. Hibernate annotations
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Q4. Java 8 Streams + Lambda
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Q1. Working style: Independent contributor or Team
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Q2. Are green-field projects alright?
Ans. 
Green-field projects are great opportunities to start fresh and implement new technologies.
• Green-field projects allow for creative freedom and innovation

• They provide the opportunity to work with the latest technologies and tools

• Starting from scratch can lead to cleaner code and better architecture

• Examples: Developing a new mobile app, creating a new website from scratch
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Q3. Are you ok with learning new tech stacks?
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Q1. Sql question, joins , store procedure
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Q2. Mvc question, mvc frame work
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