Postman Software Developer Intern Interview Questions and Answers

Round duration - 150 minutes
Round difficulty - Easy

You can give the test any time. Environment was not very well. Questions were not well explained.

Q1. 
Divide String Problem Statement
You are given a string WORD consisting of lowercase alphabets. Your task is to divide WORD into N strings of equal length.
Input:
The first line contains an integer 'T' r...read more
Ans. 
Divide a given string into N equal parts and return the divided strings as an array of strings.
• Calculate the length of each part by dividing the length of the string by N.

• Iterate through the string and extract substrings of the calculated length.

• Return the array of divided strings.

• Handle cases where it is not possible to divide the string into N equal parts.
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Q2. 
Paint House Problem Statement
You have been given a set of 'N' houses, each house can be painted using one of three colors: green, red, or yellow. A cost matrix is provided with dimensions 'N' * 3, where ...read more
Ans. 
Find the minimum total cost to paint all houses such that no two adjacent houses have the same color.
• Use dynamic programming to keep track of the minimum cost of painting each house with each color while ensuring no two adjacent houses have the same color.

• At each house, calculate the minimum cost of painting it with each color based on the previous house's colors.

• Keep updating the minimum cost for each color at each ho...read more
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Round duration - 120 Minutes
Round difficulty - Medium

Q1. 
Inorder Traversal of Binary Tree
You are provided with a Binary Tree composed of 'N' nodes, each holding integer values. Your task is to compute the Inorder traversal of this binary tree.
Example:
For t...read more
Ans. 
The task is to find the in-order traversal of a given binary tree.
• Implement a recursive function to perform in-order traversal of the binary tree

• Start from the left subtree, then visit the root node, and finally visit the right subtree

• Use an array to store the values of the nodes in the in-order traversal
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Round duration - 50 minutes
Round difficulty - Medium

Interview on google meet

Q1. Given two tables, how would you return an inner join on a common column (key)?
Ans. 
The inner join operation combines rows from two tables based on a common column (key).
• Use the JOIN keyword in the SQL query to perform an inner join.

• Specify the common column (key) in the ON clause of the join.

• The result will contain only the matching rows from both tables.
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Round duration - 50 minutes
Round difficulty - Medium

Q1. 
Search in a Row-wise and Column-wise Sorted Matrix Problem Statement
You are given an N * N matrix of integers where each row and each column is sorted in increasing order. Your task is to find the positi...read more
Ans. 
Given a sorted matrix, find the position of a target integer in the matrix.
• Iterate through each row and column of the matrix

• Compare the target integer with the current element

• If the target integer is found, return the position

• If the target integer is not found, return {-1, -1}
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Round duration - 3 Hours
Round difficulty - Hard

3 Coding questions ( 1 medium graph dfs based question , 2 hard level prefix array question ans 3 was a hard question which I don't remember)

2 Database question ( It mostly includes joining 2-3 tables and then you would be able to solve it)

Q1. 
Number of Islands Problem Statement
You are provided with a 2-dimensional matrix having N rows and M columns, containing only 1s (land) and 0s (water). Your goal is to determine the number of islands in t...read more
Ans. 
Count the number of islands in a 2D matrix of 1s and 0s.
• Use Depth First Search (DFS) or Breadth First Search (BFS) to traverse the matrix and identify connected groups of 1s.

• Maintain a visited array to keep track of visited cells to avoid counting the same island multiple times.

• Increment the island count each time a new island is encountered during traversal.

• Consider edge cases such as when the matrix is empty or when
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Q2. 
Maximum Product Subarray Problem Statement
Given an array of integers, determine the contiguous subarray that produces the maximum product of its elements.
Explanation:
A subarray can be derived from th...read more
Ans. 
Find the contiguous subarray with the maximum product of elements in an array.
• Iterate through the array and keep track of the maximum and minimum product ending at each index.

• Update the maximum product by taking the maximum of current element, current element * previous maximum, and current element * previous minimum.

• Update the minimum product by taking the minimum of current element, current element * previous maximum...read more
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Q3. You were given 3-4 models in a DBMS context. How did you join those models to obtain the desired result?
Ans. 
To join multiple models in a DBMS, use SQL JOIN statements based on common keys.
• Identify common keys between the models

• Use SQL JOIN statements (INNER JOIN, LEFT JOIN, RIGHT JOIN, FULL JOIN) to combine the models based on the common keys

• Specify the columns to be selected in the SELECT statement
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Round duration - 30 minutes
Round difficulty - Medium

These rounds depends on the type of interviewer.
My friends were asked questions from DSA but from me they asked a lot of questions on Node.JS and React.

Round duration - 30 Minutes
Round difficulty - Medium

This round depends on your interviewer.
My colleagues were asked questions from DS but my interviewer focused just on javascript.

Round duration - 45 minutes
Round difficulty - Easy

It was a managerial round they will test your communication and how well do you handle situations in your life

Q1. What is one of the most challenging situations you have faced in your life, and how did you handle it?
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Aptitude Test with 1 coding question and 8 other aptitude questions

Q1. DSA questions with some dbms questions.
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Q1. DSA + SQL query writing questions. Do revise SQL before interview.
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Aptitude test was of 1 hr

It was about 1 hr duration

Q1. What do you know about oops
Ans. 
Object-oriented programming paradigm focusing on objects and classes
• Encapsulation: Bundling data and methods that operate on the data into a single unit (object)

• Inheritance: Ability of a class to inherit properties and behavior from another class

• Polymorphism: Ability to present the same interface for different data types

• Abstraction: Hiding the complex implementation details and showing only the necessary features
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Q2. Tell me about encapsulation
Ans. 
Encapsulation is the concept of bundling data and methods that operate on the data into a single unit.
• Encapsulation helps in hiding the internal state of an object and restricting access to it.

• It allows for better control over the data by preventing outside interference.

• Encapsulation also promotes code reusability and modularity.

• Example: In object-oriented programming, classes encapsulate data fields and methods to ope
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Q1. How do you manage your team
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Q2. Why should I hire you
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2 Query question and 3 coding questions

Q1. Basic oops , Java script and Networking questions.
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Q2. What is object orienteered programming.
Ans. 
Object oriented programming is a programming paradigm based on the concept of objects, which can contain data and code.
• Objects are instances of classes, which define the structure and behavior of the objects.

• Encapsulation, inheritance, and polymorphism are key principles of object oriented programming.

• Example: Java, C++, Python are popular languages that support object oriented programming.
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Q3. Different Events in java script
Ans. 
Events in JavaScript are actions or occurrences that happen in the browser that the code can respond to.
• Events can be triggered by user actions (like clicking a button), browser actions (like page load), or system events (like a timer expiring)

• Event listeners are used to listen for and respond to events

• Common events include click, mouseover, keydown, submit, etc.
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Q4. Event listeners
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Project , coding question, DBMS

Q1. Basic personal details
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Some Objective questions and 1 Coding Questions

Q1. Situation based questions on Coroutines
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Q2. About Project Tech Stack Used and Questions on that
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Q1. The first round was a detailed discussion on one of my previous projects(almost 35 minutes, went to maximum possible depth) and one DSA question. Please prepare your resume projects very well.
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Q2. The question was a stack bases leetcode medium question.
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Q1. This was the final round. It again a follow up of the first one. Started with a project discussion(did not go that much of depth as first one) . Again one DSA question was there to solve(they make you writ...read more
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