NielsenIQ Interview Questions, Process, and Tips for Experienced

Online coding test with spring boot rest API and a java problem solving.

Q1. Design a REST API
Ans. 
Design a REST API for a backend Java developer
• Define the resources and endpoints

• Use HTTP methods like GET, POST, PUT, DELETE

• Implement authentication and authorization

• Use JSON for data exchange

• Include error handling and status codes
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Q2. Provided a list of string with names. and the result should be with a map of the name as key and number of vovels as value. Use Java stream API only.
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Q1. Difference between list and set
Ans. 
List is an ordered collection of elements with duplicates allowed, while set is an unordered collection of unique elements.
• List maintains the order of elements, while set does not guarantee any specific order.

• List allows duplicate elements, while set does not allow duplicates.

• Example: List - [1, 2, 3, 1], Set - {1, 2, 3}
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Q2. How to optimize pyspark
Ans. 
Optimizing PySpark involves tuning configurations, using efficient transformations/actions, and leveraging caching.
• Tune PySpark configurations for optimal performance (e.g. adjusting memory settings, parallelism)

• Use efficient transformations/actions to minimize unnecessary data shuffling (e.g. using narrow transformations like map instead of wide transformations like groupByKey)

• Leverage caching to persist intermediate
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Q3. Explain SOLID principles
Ans. 
SOLID principles are a set of five design principles in object-oriented programming to make software designs more understandable, flexible, and maintainable.
• S - Single Responsibility Principle: A class should have only one reason to change.

• O - Open/Closed Principle: Software entities should be open for extension but closed for modification.

• L - Liskov Substitution Principle: Objects of a superclass should be replaceable...read more
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Q1. Ticketing system design
Ans. 
Ticketing system design involves creating a platform for users to submit, track, and resolve issues or requests.
• Design a user-friendly interface for submitting tickets

• Implement a system for assigning tickets to appropriate teams or individuals

• Include features for tracking ticket status and communication with users

• Consider scalability and performance of the system

• Integrate with other tools or systems for seamless workfl
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Q2. Aws ec2 and jenkins
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Q1. Automation frameworks
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Q1. What do you mean by accruals?
Ans. 
Accruals refer to expenses that have been incurred but not yet paid, or revenue that has been earned but not yet received.
• Accruals are used to match expenses with revenues in the same accounting period.

• They are recorded as adjusting entries in the financial statements.

• Examples include accrued salaries, interest payable, and accounts receivable.

• Accruals help provide a more accurate representation of a company's financia
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Q2. What activities you have performed in previous organisation and explain them in brief
Ans. 
In my previous organization, I performed various activities including financial analysis, budgeting, and financial reporting.
• Conducted financial analysis to assess company performance and identify areas for improvement

• Assisted in budgeting process by analyzing historical data and forecasting future financial needs

• Prepared financial reports for management to aid in decision-making

• Collaborated with cross-functional teams...read more
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Q1. Few journal entries were asked
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Quant questions asked by then

Q1. About your self
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Q2. General questions asked
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