Pinterest Senior Software Engineer Interview Questions and Answers

50 questions in 12mins

Q1. Basic DSA question in binary search and memoization
Add your answer

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
Answered by AI
Add your answer

Q1. Behavioral questions
Add your answer

Q1. Minimum Knight Moves (LC Medium)
Add your answer
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
Add your answer

Q1. Interviewer asked introduction
Add your answer
Q2. After Introduction he will dig into my projects and after that one DSA Problem
Add your answer

Q1. Word search II from leetcode
Ans. 
Word search II is a problem where you have to find all words from a given list in a 2D board of characters.
• Use a trie data structure to efficiently search for words in the board.

• Implement a backtracking algorithm to explore all possible paths in the board.

• Optimize the search by pruning branches that cannot lead to a valid word.
Answered by AI
Add your answer

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.
Answered by AI
Add your answer

Q1. 1. Questions around projects : JWT, UserAuthentication etc
Add your answer
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
Answered by AI
Add your answer

Q1. 1. Write a code to reverse a linked list?
Ans. 
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
Answered by AI
Add your answer
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
Answered by AI
Add your answer
Q3. 3. Questions around project and design a database structure for comments system of quora?
Add your answer

Q1. Basic HR round questions
Add your answer

Given an simple gaming questions to be developed in JS

Given another UI design in image to be developed