Nykaa Senior Data Engineer Interview Questions and Answers

Q1. Easy DSA questions on string manipulation
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Q1. Build an MVC architecture
Ans. 
MVC architecture separates an application into Model, View, and Controller components for better organization and scalability.
• Model represents the data and business logic

• View displays the data to the user

• Controller handles user input and updates the model

• Example: Model - User class with properties like name, email; View - HTML template to display user info; Controller - User controller to handle user actions
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Q1. Discussed previous job experiences.
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Q2. Was asked if I am comfortable working on weekends/late nights during emergencies.
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Q1. What are your strengths/weaknesses.
Ans. 
Strengths - problem-solving, teamwork, communication. Weaknesses - perfectionism, time management.
• Strengths: problem-solving - I enjoy tackling complex problems and finding creative solutions.

• Strengths: teamwork - I work well with others and value collaboration in achieving common goals.

• Strengths: communication - I am able to effectively communicate technical concepts to non-technical stakeholders.

• Weaknesses: perfectio...read more
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Q1. Js basic concepts- closures, promise, arrow function and regular function difference, ssr
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Q2. React round- Develop a resuable modal component
Ans. 
Create a reusable modal component in React for displaying content dynamically.
• Use functional components and hooks for state management.

• Implement props for dynamic content: title, body, and actions.

• Utilize CSS for styling and transitions for better UX.

• Include accessibility features like ARIA roles.

• Example: <Modal title='Confirm' body='Are you sure?' onConfirm={handleConfirm} />
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Q1. Program to swap kth node from start and end in Linkedlist.
Ans. 
Swap the kth node from the start with the kth node from the end in a linked list.
• Identify the kth node from the start and end of the linked list.

• Traverse the list to find the kth node from the start.

• Simultaneously traverse to find the kth node from the end.

• Swap the values of the two identified nodes.

• Consider edge cases: if k is greater than the length of the list.
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Q2. Minimum window substring.
Ans. 
Find the smallest substring in a string that contains all characters of another string.
• Use two pointers to maintain a sliding window over the string.

• Track character counts of the target string using a hash map.

• Expand the window by moving the right pointer until all characters are included.

• Shrink the window by moving the left pointer to find the minimum length.

• Example: For s = 'ADOBECODEBANC' and t = 'ABC', the result i...read more
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Q3. Java Spring boot questions like inndoDB engine,Immutable class,Kafka basics,Profiles,Thread,Runnable , Sql query,GC, final finally finalize
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Aptitude test was on hacker earth

No coding test was taken by the interviewrrwe

Asked dome simple LinkedIn list and array questions.

Q1. Some basic Java and opps and SQL query
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Round duration - 60 minutes
Round difficulty - Easy

Technical interview round where the interviewer asked me 2 DSA based problems.

Q1. 
Buy and Sell Stock Problem Statement
Imagine you are Harshad Mehta's friend, and you have been given the stock prices of a particular company for the next 'N' days. You can perform up to two buy-and-sell ...read more
Ans. 
The task is to determine the maximum profit that can be achieved by performing up to two buy-and-sell transactions on a given set of stock prices.
• Iterate through the array of stock prices to find the maximum profit that can be achieved by buying and selling stocks at different points.

• Keep track of the maximum profit that can be achieved by considering all possible combinations of buy and sell transactions.

• Ensure that y...read more
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Q2. 
Number of Bit Flips Problem Statement
Ninja is practicing binary representations and stumbled upon an interesting problem. Given two numbers 'A' and 'B', you are required to determine how many bits need t...read more
Ans. 
Calculate the number of bit flips required to convert one number to another in binary representation.
• Convert both numbers to binary representation

• Count the number of differing bits between the two numbers

• Output the count of differing bits as the number of bit flips required

• Example: A = 13 (1101), B = 7 (0111) -> 2 bit flips required
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Round duration - 60 minutes
Round difficulty - Medium

Technical interview round where the interviewer asked me 2 DSA based problems.

Q1. 
Boundary Traversal of a Binary Tree
Given a binary tree of integers, your task is to return the boundary nodes of the tree in Anti-Clockwise direction starting from the root node.
Input:
The first line ...read more
Ans. 
Return the boundary nodes of a binary tree in Anti-Clockwise direction starting from the root node.
• Traverse the left boundary nodes in top-down order

• Traverse the leaf nodes in left-right order

• Traverse the right boundary nodes in bottom-up order

• Handle cases where duplicates occur in boundary nodes
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Q2. 
Reverse Linked List in Groups of K
You are provided with a linked list containing 'N' nodes and an integer 'K'. The task is to reverse the linked list in groups of size K, which means reversing the nodes ...read more
Ans. 
Reverse a linked list in groups of size K by reversing nodes in each group.
• Iterate through the linked list in groups of size K

• Reverse each group of nodes

• Handle cases where the number of elements in the last group is less than K
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Round duration - 30 minutes
Round difficulty - Easy

Typical HR round where the interviewer asked behavioral problems.

Q1. Design hld interview asked question
Ans. 
Design a high-level architecture for a scalable online bookstore platform.
• Use microservices architecture for modularity and scalability.

• Implement a RESTful API for communication between frontend and backend services.

• Utilize a relational database (e.g., PostgreSQL) for storing book and user data.

• Incorporate a caching layer (e.g., Redis) to improve performance for frequently accessed data.

• Consider using a message broker ...read more
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Q2. Design lld asked question
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Design a URL shortening service like Bitly that generates short links for long URLs.
• Define the core functionality: generate, retrieve, and delete short URLs.

• Use a hash function to create unique short links from long URLs.

• Implement a database to store mappings of short URLs to long URLs.

• Consider user authentication for tracking link usage and analytics.

• Implement rate limiting to prevent abuse of the service.
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