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Paytm Software Engineer Interview Questions and Answers

Updated 19 Dec 2024

85 Interview questions

A Software Engineer was asked 6mo ago
Q. Given an m x n matrix, where each row and each column is sorted in ascending order, design an efficient algorithm to search for a specific value in the matrix.
Ans. 

Search for a target value in a sorted matrix efficiently.

  • Start from the top right corner and move left or down based on comparison with target value

  • Utilize the sorted nature of the matrix to eliminate certain rows or columns

  • Implement binary search for more efficient search in each row or column

A Software Engineer was asked 8mo ago
Q. Explain the internal workings of a hashmap.
Ans. 

HashMap is a data structure that stores key-value pairs and uses hashing to quickly retrieve values based on keys.

  • HashMap internally uses an array of linked lists to store key-value pairs.

  • When a key-value pair is added, the key is hashed to determine the index in the array where it will be stored.

  • If multiple keys hash to the same index, a collision occurs and the key-value pairs are stored in a linked list at that...

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A Software Engineer was asked 8mo ago
Q. Given head, the head of a linked list, determine if the linked list has a cycle in it. There is a cycle in a linked list if there is some node in the list that can be reached again by continuously following...
Ans. 

Use Floyd's Tortoise and Hare algorithm to detect cycle in a linked list.

  • Initialize two pointers, slow and fast, at the head of the linked list.

  • Move slow pointer by one step and fast pointer by two steps.

  • If they meet at any point, there is a cycle in the linked list.

A Software Engineer was asked 9mo ago
Q. What are the differences between MongoDB and SQL?
Ans. 

MongoDB is a NoSQL database while SQL is a relational database management system.

  • MongoDB is schema-less, allowing for flexible data models.

  • SQL databases use structured query language for defining and manipulating data.

  • MongoDB is better suited for unstructured or semi-structured data, while SQL is better for structured data.

  • SQL databases are ACID compliant, ensuring data integrity, while MongoDB sacrifices some ACI...

A Software Engineer was asked 9mo ago
Q. What are the differences between a HashMap and a Hashtable?
Ans. 

HashMap is non-synchronized and allows null values, while Hashtable is synchronized and does not allow null keys or values.

  • HashMap is non-synchronized, meaning it is not thread-safe, while Hashtable is synchronized and thread-safe.

  • HashMap allows null values and one null key, while Hashtable does not allow null keys or values.

  • HashMap is generally preferred for non-thread-safe applications, while Hashtable is used i...

A Software Engineer was asked 11mo ago
Q. How do you convert a Binary Search Tree (BST) to a range?
Ans. 

Convert a Binary Search Tree (BST) into a new BST containing only nodes within a given range.

  • Perform inorder traversal of the original BST and only add nodes within the given range to the new BST.

  • Recursively call the function on left and right subtrees while checking the node values against the range.

  • Adjust the pointers of the nodes to form the new BST.

A Software Engineer was asked 11mo ago
Q. Given the head of a linked list, rotate the list to the right by k places.
Ans. 

Rotate a linked list by k positions

  • Traverse the linked list to find the length and the last node

  • Connect the last node to the head to make it a circular linked list

  • Traverse again to find the new tail node at position length - k % length

  • Set the new head as the next node of the new tail and update the new tail's next to null

Are these interview questions helpful?
A Software Engineer was asked 11mo ago
Q. Given a rotated sorted array, find the index of a target element. Return -1 if the element is not found.
Ans. 

Find an element in a rotated sorted array using binary search for efficient lookup.

  • A rotated sorted array is created by taking a sorted array and rotating it at a pivot point.

  • Example: [4, 5, 6, 7, 0, 1, 2] is a rotated version of [0, 1, 2, 4, 5, 6, 7].

  • Use binary search to find the target element, adjusting the search range based on the pivot.

  • If the middle element is greater than the rightmost element, the pivot is...

A Software Engineer was asked 11mo ago
Q. Implement the quick sort algorithm.
Ans. 

Quick sort is an efficient sorting algorithm that uses a divide-and-conquer approach to sort elements in an array.

  • 1. Choose a 'pivot' element from the array.

  • 2. Partition the array into two sub-arrays: elements less than the pivot and elements greater than the pivot.

  • 3. Recursively apply the above steps to the sub-arrays.

  • 4. Combine the sorted sub-arrays and the pivot to get the final sorted array.

  • Example: For array ...

A Software Engineer was asked 12mo ago
Q. What are five of your strengths and weaknesses?
Ans. 

Strengths: Problem-solving skills, teamwork, adaptability, attention to detail, communication. Weaknesses: Impatience, public speaking, delegation, perfectionism, time management.

  • Strengths: Problem-solving skills - I enjoy tackling complex issues and finding creative solutions.

  • Teamwork - I work well with others and value collaboration in achieving common goals.

  • Adaptability - I am able to quickly adjust to new situ...

1 2 3 4 5 6 7

Paytm Software Engineer Interview Experiences

51 interviews found

Software Engineer Interview Questions & Answers

user image Anonymous

posted on 19 Nov 2024

Interview experience
4
Good
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Technical 

(3 Questions)

  • Q1. Search in a sorted matrix
  • Add your answer
  • Q2. Rotting orange graph
  • Add your answer
  • Q3. Database Indexing and SQL
  • Add your answer
Round 2 - Technical 

(3 Questions)

  • Q1. Design Patterns
  • Add your answer
  • Q2. Medium level Binary tree question
  • Add your answer
  • Q3. Previous work discussion
  • Add your answer

Skills evaluated in this interview

Anonymous

Software Engineer Interview Questions & Answers

user image Anonymous

posted on 27 Jun 2024

Interview experience
5
Excellent
Difficulty level
Easy
Process Duration
Less than 2 weeks
Result
Selected Selected
Round 1 - Aptitude Test 

1st round was online test with 3 easy-medium leetcode questions

Round 2 - Technical 

(2 Questions)

  • Q1. Quick sort was asked to be implemented
  • Ans. 

    Quick sort is an efficient sorting algorithm that uses a divide-and-conquer approach to sort elements in an array.

    • 1. Choose a 'pivot' element from the array.

    • 2. Partition the array into two sub-arrays: elements less than the pivot and elements greater than the pivot.

    • 3. Recursively apply the above steps to the sub-arrays.

    • 4. Combine the sorted sub-arrays and the pivot to get the final sorted array.

    • Example: For array [3, 6...

  • Answered by AI
    Add your answer
  • Q2. Some SQL queries were asked involving joins
  • Add your answer
Round 3 - Technical 

(2 Questions)

  • Q1. Standard stack based question -> valid parenthesis
  • Add your answer
  • Q2. Only one question was asked
  • Add your answer
Anonymous

Software Engineer Interview Questions & Answers

user image Anonymous

posted on 21 Oct 2024

Interview experience
4
Good
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Coding Test 

Javascript, nodejs, react qustions

Round 2 - Technical 

(2 Questions)

  • Q1. Nodejs event loop
  • Add your answer
  • Q2. React lifecycle , hooks and redux
  • Add your answer
Anonymous

Software Engineer Interview Questions & Answers

user image Anonymous

posted on 9 Sep 2024

Interview experience
3
Average
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Not Selected

I applied via Naukri.com and was interviewed in Aug 2024. There was 1 interview round.

Round 1 - One-on-one 

(2 Questions)

  • Q1. Difference between hashmap and hashtable
  • Add your answer
  • Q2. Difference between mongodb and sql
  • Ans. 

    MongoDB is a NoSQL database while SQL is a relational database management system.

    • MongoDB is schema-less, allowing for flexible data models.

    • SQL databases use structured query language for defining and manipulating data.

    • MongoDB is better suited for unstructured or semi-structured data, while SQL is better for structured data.

    • SQL databases are ACID compliant, ensuring data integrity, while MongoDB sacrifices some ACID pro...

  • Answered by AI
    Add your answer

Skills evaluated in this interview

Anonymous

Software Engineer Interview Questions & Answers

user image Anonymous

posted on 19 Dec 2024

Interview experience
5
Excellent
Difficulty level
Moderate
Process Duration
2-4 weeks
Result
Selected Selected

I applied via Referral and was interviewed in Jun 2024. There were 3 interview rounds.

Round 1 - Coding Test 

Got an hackerRank test link which consists HTML, CSS, JS, React and DSA question with MCQs.

Round 2 - One-on-one 

(2 Questions)

  • Q1. JS related discussion.
  • Add your answer
  • Q2. DSA question
  • Add your answer
Round 3 - One-on-one 

(2 Questions)

  • Q1. React machine coding round
  • Add your answer
  • Q2. DSA question
  • Add your answer

Interview Preparation Tips

Interview preparation tips for other job seekers - Focus on the basics and be consistent with your prepration.
Anonymous

Software Engineer Interview Questions & Answers

user image Anonymous

posted on 10 Jun 2024

Interview experience
4
Good
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Coding Test 

Medium level one coding question

Round 2 - Technical 

(2 Questions)

  • Q1. Question related to project mentioned in resume
  • Add your answer
  • Q2. Question related to projects
  • Add your answer
Anonymous

Software Engineer Interview Questions & Answers

user image Anonymous

posted on 4 Apr 2024

Interview experience
4
Good
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Coding Test 

2 questions in DSA on arrays and linked list

Round 2 - Technical 

(1 Question)

  • Q1. 1 question on linked list and general discussion
  • Add your answer
Round 3 - One-on-one 

(1 Question)

  • Q1. Questions about realtime problem solving, no coding directly
  • Add your answer
Anonymous

Software Engineer Interview Questions & Answers

user image Vipul Bhasin

posted on 8 Jun 2024

Interview experience
4
Good
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Technical 

(2 Questions)

  • Q1. LinkedIn List based problems
  • Ans. 

    LinkedIn List based problems involve manipulating linked lists to solve various coding challenges.

    • Implement common linked list operations like insertion, deletion, and traversal.

    • Solve problems involving reversing a linked list, detecting cycles, or finding the intersection point of two linked lists.

    • Use techniques like two pointers, recursion, or hash tables to optimize solutions.

  • Answered by AI
    Add your answer
  • Q2. Hashing based problems and questions
  • Add your answer

Skills evaluated in this interview

Anonymous

Software Engineer Interview Questions & Answers

user image Anonymous

posted on 2 Jul 2024

Interview experience
4
Good
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Technical 

(2 Questions)

  • Q1. Rotate a linked List
  • Ans. 

    Rotate a linked list by k positions

    • Traverse the linked list to find the length and the last node

    • Connect the last node to the head to make it a circular linked list

    • Traverse again to find the new tail node at position length - k % length

    • Set the new head as the next node of the new tail and update the new tail's next to null

  • Answered by AI
    Add your answer
  • Q2. Find the element in rotated sorted array
  • View 1 more answer

Skills evaluated in this interview

Anonymous

Software Engineer Interview Questions & Answers

user image Anonymous

posted on 3 Apr 2024

Interview experience
3
Average
Difficulty level
-
Process Duration
-
Result
-
Round 1 - One-on-one 

(2 Questions)

  • Q1. Kth element in a linked list
  • Ans. 

    To find the kth element in a linked list, iterate through the list and return the element at the kth position.

    • Iterate through the linked list while keeping track of the current position

    • Return the element when the current position equals k

    • Handle cases where k is out of bounds or the linked list is empty

  • Answered by AI
    Add your answer
  • Q2. Level order traversal with alternate order
  • Ans. 

    Level order traversal of a binary tree with alternate order

    • Use a queue to perform level order traversal

    • Alternate the order of nodes at each level

    • Example: For a binary tree with nodes 1, 2, 3, 4, 5, the output could be ['1', '3 2', '4 5']

  • Answered by AI
    Add your answer

Skills evaluated in this interview

Anonymous

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Interview Tips & Stories
2w (edited)
timepasstiwari
·
A Digital Markter
Nailed the interview, still rejected
Just had the BEST interview ever – super positive and encouraging! But got rejected. Interviewer said I was the most prepared, knew it was a full-time role (unlike others), and loved my answers. One of my questions was even called "the best ever asked!" He showed me around, said I was exactly what they wanted, and would get back by Friday. I was so hyped! Then today, I got the rejection email. No reason given, just "went with someone else." Feels bad when your best isn't enough. Anyone else been there? How'd you cope?
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More about working at Paytm
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  • FinTech
  • 10k-50k Employees (India)
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Paytm Interview FAQs

How many rounds are there in Paytm Software Engineer interview?
Paytm interview process usually has 2-3 rounds. The most common rounds in the Paytm interview process are Technical, Coding Test and One-on-one Round.
How to prepare for Paytm Software Engineer interview?
Go through your CV in detail and study all the technologies mentioned in your CV. Prepare at least two technologies or languages in depth if you are appearing for a technical interview at Paytm. The most common topics and skills that interviewers at Paytm expect are Application Development, Backend, Financial Services, Product Management and Software Engineering.
What are the top questions asked in Paytm Software Engineer interview?

Some of the top questions asked at the Paytm Software Engineer interview -

  1. Puzzle : 100 people are standing in a circle .each one is allowed to shoot a pe...read more
  2. How will you implement a shuffle function for a playlist of so...read more
  3. How many BSTs are possible with two nodes and three nod...read more
How long is the Paytm Software Engineer interview process?

The duration of Paytm Software Engineer interview process can vary, but typically it takes about less than 2 weeks to complete.

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based on 40 interview experiences

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Duration

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