Esper Senior Software Engineer Interview Questions and Answers

Q1. Ds Algo round. Any programming language
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Q1. System design: url shortner, moving large file from one location to other location with LLD
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Q1. Salary discussion more of a formality if you clear technical rounds
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Q1. Questions on what project you worked on
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Q2. Design 2 factor authentication
Ans. 
Implementing 2 factor authentication for enhanced security
• Require users to enter their password as the first factor

• Send a unique code to the user's registered email or phone as the second factor

• Prompt the user to enter the code to complete the authentication process
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Very basic problem solving round

Q1. Medium level DSA problem solving round
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Write a program that solves sudoku

Q1. How do you build a tiny URL Application?
Ans. 
A tiny URL application is built by generating short aliases for long URLs, storing them in a database, and redirecting users to the original URL when the alias is accessed.
• Generate a unique short alias for each long URL

• Store the alias and corresponding long URL in a database

• Implement a redirect mechanism to redirect users from the alias to the original URL

• Handle edge cases like duplicate URLs, expired aliases, and inva
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Basic DS question like dutch flag problem.

Q1. Implement debounce function
Ans. 
Debounce function delays the execution of a function until after a specified amount of time has passed since the last time it was invoked.
• Create a function that takes a function and a delay time as parameters

• Use setTimeout to delay the execution of the function

• Use clearTimeout to reset the timer if the function is invoked again within the delay time
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Q2. Closure based questions.
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Two questions asked:
1. Partition equal sum
2. find length largest region boolean matrix

Hacker rank evaluation with three questions

Q1. Android fundamentals
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Q2. Lifecycle methods and synchronization
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Q1. Comparator based problem solving
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Q2. Binary tree based Hashmap question
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Q1. Usual behavior fit questions
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Q1. Immediate higher number to right
Ans. 
The immediate higher number to the right of each element in an array
• Iterate through the array from right to left

• For each element, compare it with the elements to its right to find the immediate higher number

• Store the immediate higher number in a new array
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Q2. Count pair whose sum is perfect square.
Ans. 
Count pairs in an array whose sum is a perfect square.
• Iterate through the array and calculate the sum of each pair.

• Check if the sum is a perfect square using a function.

• Increment a counter if the sum is a perfect square.

• Return the final count of pairs.
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Q3. Parking lot LLD
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Q4. E Commerce HLD and LLD
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Q5. Kth largest number in BST
Ans. 
To find the Kth largest number in a Binary Search Tree (BST), we can perform an in-order traversal and keep track of the Kth largest element.
• Perform an in-order traversal of the BST to get the elements in non-decreasing order.

• Keep track of the Kth largest element while traversing the BST.

• Return the Kth largest element once found.
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