Instahyre Senior Software Engineer Interview Questions and Answers

Q1. 1. Questions around projects : JWT, UserAuthentication etc
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Q2. 2. Write a code to find frequency of characters in a given string?
Ans. 
Code to find frequency of characters in a given string
• Use a hash table to store character frequencies

• Iterate through the string and update the hash table accordingly

• Print the hash table to display the character frequencies
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Q1. 1. Write a code to reverse a linked list?
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Code to reverse a linked list
• Create three pointers: prev, curr, and next

• Initialize prev to null and curr to head

• Loop through the list and set next to curr's next node

• Set curr's next node to prev

• Move prev and curr one node ahead

• Return prev as the new head
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Q2. 2. Write a code to reverse linked list in size of K?
Ans. 
Code to reverse linked list in size of K
• Create a function that takes head of linked list and size K as input

• Traverse the linked list in groups of K nodes

• Reverse each group of K nodes using iterative or recursive approach

• Connect the reversed groups to form the final linked list

• Return the new head of the reversed linked list
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Q3. 3. Questions around project and design a database structure for comments system of quora?
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Q1. Basic HR round questions
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Given an simple gaming questions to be developed in JS

Given another UI design in image to be developed

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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1st round was DSA, Algo round with 2 questions

Q1. Left view of binary tree
Ans. 
Left view of a binary tree is the set of nodes visible when the tree is viewed from the left side.
• Traverse the tree level by level from left to right

• Keep track of the first node encountered at each level

• Use a queue data structure for level order traversal
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Q1. Dynamic programming
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Q2. Multi-threading
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Q1. Water holding capacity in btw building
Ans. 
Water holding capacity in between building refers to the ability of a building to retain water without leaking or flooding.
• Water holding capacity can be influenced by the type of materials used in construction.

• Proper waterproofing techniques can improve a building's water holding capacity.

• Drainage systems play a crucial role in managing excess water around a building.

• Examples: using waterproof membranes on roofs, insta
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