Uplers Senior Software Engineer Interview Questions and Answers

Q1. Components of service
Ans. 
Components of a service include functionality, reliability, availability, and performance.
• Functionality: The service should perform the intended tasks and meet the requirements.

• Reliability: The service should consistently deliver the expected results.

• Availability: The service should be accessible and operational when needed.

• Performance: The service should perform efficiently and meet performance expectations.
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Q2. Lifecycles of web api
Ans. 
The lifecycle of a web API refers to the stages it goes through from development to retirement.
• The lifecycle typically includes stages like planning, development, testing, deployment, and retirement.

• During planning, the requirements and design of the API are defined.

• Development involves writing the code and implementing the functionality.

• Testing ensures the API works as expected and meets the requirements.

• Deployment in...read more
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Q1. Print the nodes of a n-ary tree in an arc wise manner as seen from the outside.
Ans. 
Print nodes of n-ary tree in arc wise manner from outside
• Traverse the tree level by level from outside to inside

• Use a queue to keep track of nodes at each level

• Print the nodes at each level in a clockwise or anticlockwise manner
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Q1. Minimum Knight Moves (LC Medium)
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Q2. OS, CN, DB concepts like multithreading, semaphore, tcp vs udp, transaction and ACId properties. Java concepts like stack vs heap(memory), error vs exception. Any 1 Project discussion for 10 mins
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Implement boolean canConstruct(String targetString, String[] dict) which returns true if we can construct the targetString by concatenating the words given in the dictionary

Q1. Implement key value store
Ans. 
Implement a key value store for storing and retrieving data efficiently.
• Use a hash table or a balanced tree data structure to store key-value pairs.

• Implement functions for inserting, updating, deleting, and retrieving key-value pairs.

• Consider implementing features like transactions, concurrency control, and data persistence.

• Example: Implement a simple key value store using a hash table in Python.
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45 min round. Similar to Leetcode medium level question.

45 min coding round, 2 question asked

Q1. System design of proximity service
Ans. 
Design a system for proximity service
• Utilize geolocation data to track user locations

• Implement algorithms to calculate proximity between users

• Use real-time updates to notify users of nearby contacts
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Q1. Behavioral questions
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Q1. Hiring manager round
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Q2. Questions on previous projects
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Q1. Longest subsequence with sum zero
Ans. 
Find the longest subsequence in an array with sum zero.
• Iterate through the array and keep track of the running sum.

• Store the running sum in a hashmap along with the index.

• If the same sum is encountered again, the subsequence between the two indices has a sum of zero.
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Q2. Find diameter of tree
Ans. 
The diameter of a tree is the longest path between two leaf nodes in the tree.
• Calculate the longest path between two leaf nodes in the tree

• This can be done by finding the height of the left and right subtrees and adding them together

• The diameter of the tree is the maximum of either the diameter of the left subtree, the diameter of the right subtree, or the sum of the heights of the left and right subtrees
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Q1. System design: Hotel booking system
Ans. 
Design a hotel booking system for managing reservations and availability.
• Use a database to store hotel information, room availability, and reservations.

• Implement user authentication and authorization for booking.

• Include a search feature for users to find available rooms based on their criteria.

• Allow users to make reservations, modify or cancel them.

• Send confirmation emails to users after successful bookings.
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Divide one big integer by another

Q1. Prefer not to due to NDA
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Brush up on DS and Algorithms