Rippling Software Development Engineer II Interview Questions and Answers

DSA question.
1 - stocks buy/sell

Q1. Merge sort related DSA problem
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Q2. Linked List DSA problem
Ans. 
Implement a linked list data structure and solve a problem using it.
• Understand the basic concepts of linked lists such as nodes and pointers.

• Implement functions to insert, delete, and search for elements in the linked list.

• Solve a problem like reversing a linked list or finding the middle element using linked list operations.
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Q1. Design for TrueCaller
Ans. 
Design a system similar to TrueCaller for identifying unknown callers.
• Implement a database of phone numbers and associated names

• Allow users to report spam numbers

• Use machine learning algorithms to identify spam calls

• Provide a caller ID feature for incoming calls
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Q1. Previous project experiences
Ans. 
Led development of a cloud-based inventory management system for a retail company.
• Managed a team of 5 developers to design and implement the system

• Utilized AWS services for scalability and reliability

• Integrated with existing ERP system for seamless data flow
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Q1. Why are you leaving your current job
Ans. 
Seeking new challenges and opportunities for growth
• Looking for a new challenge to further develop my skills and knowledge

• Interested in exploring different technologies and industries

• Seeking opportunities for career advancement and growth

• Current job lacks opportunities for professional development
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Question was easy, interviewer was friendly.

Q1. Code postorder traversal without using recursion.
Ans. 
Iterative solution using a stack to perform postorder traversal.
• Use a stack to simulate the recursive call stack.

• Push nodes in the order of right, left, root.

• Pop nodes from stack and add to result array.

• Repeat until stack is empty.
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Q2. Leetcode Problem 1626 - Best team with no conflicts.
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Q1. Design whatsapp with one to one, group messaging and read receipts functionalities. Design the database.
Ans. 
Design a messaging app like WhatsApp with one-to-one, group messaging, and read receipts functionalities.
• Use a relational database to store user information, messages, and group memberships.

• Create tables for users, messages, groups, and group memberships.

• Include columns for message content, sender, receiver, timestamp, and read status.

• Implement a feature to mark messages as read with read receipts.

• Use indexes for effic
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Q2. Questions on dbms, cn and os.
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Q1. Binary search for closest element
Ans. 
Binary search to find the closest element in a sorted array
• Implement binary search to find the target element in the array

• Keep track of the closest element found so far while searching

• Update the closest element if a closer one is found during the search
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Q2. String manipulation
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Q1. Low level Design for an online e-commerce website
Ans. 
Low level design for an online e-commerce website involves designing the architecture and components of the website.
• Identify the main components such as user interface, database, payment gateway, product catalog, etc.

• Design the database schema to store user information, product details, orders, etc.

• Implement user authentication and authorization mechanisms for secure access.

• Integrate payment gateway for processing tran...read more
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1 hour duration, a game somuation LLD question was asked

It was a bar raiser round and questions were related to trees and binary search

Q1. Design LLD of google calendar
Ans. 
Design LLD of google calendar
• Use microservices architecture for scalability and maintainability

• Implement features like event creation, editing, deletion, reminders, and sharing

• Utilize databases for storing user data and events

• Include user authentication and authorization for security

• Integrate with external APIs for syncing with other calendars
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