Upload Button Icon Add office photos
Premium Employer

i

This company page is being actively managed by Paytm Team. If you also belong to the team, you can get access from here

Paytm Verified Tick

Compare button icon Compare button icon Compare

Filter interviews by

Paytm Senior Software Engineer Interview Questions and Answers

Updated 14 May 2025

37 Interview questions

A Senior Software Engineer was asked 5mo ago
Q. What are the best and worst solutions for the coding problem "Longest Substring Without Repeating Characters," including a detailed explanation of each solution along with their time and space complexity?
Ans. 

The Longest Substring Without Repeating Characters problem involves finding the length of the longest substring without any repeating characters.

  • Best solution: Sliding Window approach with HashSet to track unique characters. Time complexity O(n), space complexity O(min(n, m)) where n is the length of the string and m is the size of the character set.

  • Worst solution: Brute force approach checking all substrings for ...

🔥 Asked by recruiter 2 times
A Senior Software Engineer was asked 8mo ago
Q. Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it can trap after raining.
Ans. 

Rain water trapping problem involves calculating the amount of rainwater that can be trapped between buildings.

  • Calculate the maximum height of water that can be trapped at each index

  • Calculate the water trapped at each index by subtracting the height of the building at that index

  • Sum up the water trapped at each index to get the total amount of rainwater trapped

Senior Software Engineer Interview Questions Asked at Other Companies

asked in UST
Q1. Nth Prime Number Problem Statement Find the Nth prime number give ... read more
asked in DBS Bank
Q2. Tell me about yourself. What technology are you using? What is a ... read more
Q3. K Largest Elements Problem Statement You are given an integer k a ... read more
asked in GlobalLogic
Q4. MapSum Pair Implementation Create a data structure named 'MapSum' ... read more
Q5. If you have to prioritize between coding standards and project de ... read more
A Senior Software Engineer was asked 9mo ago
Q. Describe how you would design a system for a chat application.
Ans. 

Design a system for a chat application

  • Use WebSocket for real-time communication

  • Implement message queuing for reliable message delivery

  • Include features like read receipts, typing indicators, and message history

  • Design a user-friendly interface with customizable themes and emojis

  • Ensure end-to-end encryption for secure communication

A Senior Software Engineer was asked 11mo ago
Q. Implement a useDebounce hook.
Ans. 

Custom hook for debouncing user input in React applications

  • Accepts a value and delay as arguments

  • Uses useEffect to set a timeout to update the debounced value after the specified delay

  • Returns the debounced value and a function to update the input value

A Senior Software Engineer was asked 11mo ago
Q. Describe how to create language change functionality using useContext and useReducer.
Ans. 

Implement language change functionality using useContext and useReducer

  • Create a LanguageContext to store the current language state

  • Use useReducer to handle state changes for language selection

  • Dispatch actions to update the language state based on user selection

A Senior Software Engineer was asked 12mo ago
Q. Create traffic lights in React.js with lights changing color based on a time configuration.
Ans. 

Create a traffic light simulation in react.js with changing colors based on time configuration.

  • Use React state to manage the current color of the traffic light

  • Set up a timer to change the color of the traffic light at specified intervals

  • Use CSS to style the traffic light and different colors for each light

A Senior Software Engineer was asked 12mo ago
Q. For infinite scrolling, how do you handle large datasets to ensure efficient and smooth loading while scrolling up and down?
Ans. 

To handle large size data for infinite scroll, use virtual scrolling, lazy loading, and optimize data fetching/rendering.

  • Implement virtual scrolling to render only the visible items on the screen, reducing memory usage and improving performance.

  • Use lazy loading to fetch more data as the user scrolls, avoiding loading all data at once.

  • Optimize data fetching and rendering by using efficient algorithms and data struc...

Are these interview questions helpful?
A Senior Software Engineer was asked 12mo ago
Q. How do you achieve responsiveness across all screen sizes?
Ans. 

Achieve responsive design by using media queries, flexible layouts, and fluid grids.

  • Use media queries to adjust styles based on screen size

  • Create flexible layouts that adapt to different screen sizes

  • Implement fluid grids to ensure content scales proportionally

A Senior Software Engineer was asked
Q. Create a REST API with all the layers.
Ans. 

Creating a REST API involves defining endpoints, handling requests, and structuring data layers.

  • Define the API endpoints using a framework like Express.js in Node.js.

  • Implement controllers to handle business logic for each endpoint.

  • Use a service layer to interact with the database, abstracting data access.

  • Create models to define the structure of data, e.g., using Mongoose for MongoDB.

  • Set up middleware for error han...

A Senior Software Engineer was asked
Q. Design a notification service.
Ans. 

Design a notification service for sending real-time alerts to users.

  • Use a scalable messaging system like Kafka or RabbitMQ to handle high volume of notifications.

  • Implement a user preference system to allow users to choose their preferred notification channels (email, SMS, push notifications, etc).

  • Include a scheduling feature to send notifications at specific times or intervals.

  • Ensure notifications are personalized...

Paytm Senior Software Engineer Interview Experiences

39 interviews found

Interview experience
5
Excellent
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Not Selected

I appeared for an interview in Dec 2024.

Round 1 - Technical 

(1 Question)

  • Q1. What are the best and worst solutions for the coding problem "Longest Substring Without Repeating Characters," including a detailed explanation of each solution along with their time and space complexity?
  • Ans. 

    The Longest Substring Without Repeating Characters problem involves finding the length of the longest substring without any repeating characters.

    • Best solution: Sliding Window approach with HashSet to track unique characters. Time complexity O(n), space complexity O(min(n, m)) where n is the length of the string and m is the size of the character set.

    • Worst solution: Brute force approach checking all substrings for uniqu...

  • Answered by AI
Round 2 - Technical 

(1 Question)

  • Q1. Questions regarding Redis and cache eviction policies, and how would you implement a low-level design for the Least Recently Used (LRU) cache algorithm?
Interview experience
3
Average
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
No response

I applied via Approached by Company and was interviewed in Aug 2024. There were 3 interview rounds.

Round 1 - Coding Test 

Coding Test on HackerRank

Round 2 - Technical 

(2 Questions)

  • Q1. Design System for Chat Application
  • Ans. 

    Design a system for a chat application

    • Use WebSocket for real-time communication

    • Implement message queuing for reliable message delivery

    • Include features like read receipts, typing indicators, and message history

    • Design a user-friendly interface with customizable themes and emojis

    • Ensure end-to-end encryption for secure communication

  • Answered by AI
  • Q2. You can answer by your understanding
Round 3 - One-on-one 

(2 Questions)

  • Q1. Question-based on Flat Array
  • Q2. Solve this problem by your understanding.

Interview Preparation Tips

Topics to prepare for Paytm Senior Software Engineer interview:
  • System Design
  • Database
  • DSA
Interview preparation tips for other job seekers - They are not serious about the opening.

Skills evaluated in this interview

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

Duration - 1 hour
Topic - DS/Algo

Round 2 - Technical 

(2 Questions)

  • Q1. Questions related to current project
  • Q2. Ask design of current project
Round 3 - Technical 

(1 Question)

  • Q1. Questions related to current project
Interview experience
4
Good
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via LinkedIn and was interviewed in Aug 2024. There were 2 interview rounds.

Round 1 - Coding Test 

The first round was a hackerrank dsa round where i was asked below problems from difficulty easy to medium.
1. Max even sum subseqynce
2.Find length of longest subsequnce of one string which is substring of another

Round 2 - One-on-one 

(4 Questions)

  • Q1. What is kafka and your use case where you have used
  • Ans. 

    Kafka is a distributed streaming platform used for building real-time data pipelines and streaming applications.

    • Kafka is used for real-time data processing, messaging, and event streaming.

    • It provides high-throughput, fault-tolerant, and scalable messaging system.

    • Example use case: Implementing a real-time analytics dashboard for monitoring website traffic.

  • Answered by AI
  • Q2. Basic Redis questions
  • Q3. Rain water trapping dsa problem
  • Ans. 

    Rain water trapping problem involves calculating the amount of rainwater that can be trapped between buildings.

    • Calculate the maximum height of water that can be trapped at each index

    • Calculate the water trapped at each index by subtracting the height of the building at that index

    • Sum up the water trapped at each index to get the total amount of rainwater trapped

  • Answered by AI
  • Q4. Basiv SQL queries and indexes

Skills evaluated in this interview

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

I appeared for an interview in Apr 2025, where I was asked the following questions.

  • Q1. DSa easy to medium
  • Q2. Js Advance type question, Pollyfill, curring, function generator
Interview experience
4
Good
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Technical 

(2 Questions)

  • Q1. Rain water tapping problem
  • Ans. 

    Calculate the amount of rainwater that can be trapped between buildings after rainfall based on their heights.

    • Use two-pointer technique to traverse the height array from both ends.

    • Maintain left and right max heights to calculate trapped water.

    • For each position, water trapped = min(leftMax, rightMax) - height[i].

    • Example: For heights [0,1,0,2,1,0,1,3,2,1,2,1], trapped water = 6.

  • Answered by AI
  • Q2. I don't remember the second one
Interview experience
3
Average
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Technical 

(2 Questions)

  • Q1. Design patterns
  • Q2. Entity Framework
Interview experience
1
Bad
Difficulty level
-
Process Duration
-
Result
-
  • Q1. Tricky questions
  • Q2. OS, Coding questions
Interview experience
5
Excellent
Difficulty level
-
Process Duration
-
Result
-

I applied via Campus Placement

Round 1 - Coding Test 

3 questions easy to medium level

Round 2 - Technical 

(1 Question)

  • Q1. 2 DSA questions
Round 3 - Technical 

(1 Question)

  • Q1. Dsa questions , oops , dbms
Round 4 - HR 

(1 Question)

  • Q1. Basic discussion
Interview experience
5
Excellent
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Technical 

(2 Questions)

  • Q1. Create useDebounce hook
  • Ans. 

    Custom hook for debouncing user input in React applications

    • Accepts a value and delay as arguments

    • Uses useEffect to set a timeout to update the debounced value after the specified delay

    • Returns the debounced value and a function to update the input value

  • Answered by AI
  • Q2. Create language change functionality using useContext and useReducer
  • Ans. 

    Implement language change functionality using useContext and useReducer

    • Create a LanguageContext to store the current language state

    • Use useReducer to handle state changes for language selection

    • Dispatch actions to update the language state based on user selection

  • Answered by AI

Skills evaluated in this interview

Top trending discussions

View All
Interview Tips & Stories
2w
toobluntforu
·
works at
Cvent
Can speak English, can’t deliver in interviews
I feel like I can't speak fluently during interviews. I do know english well and use it daily to communicate, but the moment I'm in an interview, I just get stuck. since it's not my first language, I struggle to express what I actually feel. I know the answer in my head, but I just can’t deliver it properly at that moment. Please guide me
Got a question about Paytm?
Ask anonymously on communities.

Paytm Interview FAQs

How many rounds are there in Paytm Senior 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 Senior 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 Financial Services, EDC, Application Development, Backend and Product Management.
What are the top questions asked in Paytm Senior Software Engineer interview?

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

  1. What are the best and worst solutions for the coding problem "Longest Substring...read more
  2. Infinite scroll - how to handle large size data, efficient and smooth loading b...read more
  3. What is kafka and your use case where you have u...read more
How long is the Paytm Senior Software Engineer interview process?

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

Tell us how to improve this page.

Overall Interview Experience Rating

3.5/5

based on 35 interview experiences

Difficulty level

Easy 11%
Moderate 89%

Duration

Less than 2 weeks 68%
2-4 weeks 26%
4-6 weeks 5%
View more
Paytm Senior Software Engineer Salary
based on 1.5k salaries
₹11 L/yr - ₹38 L/yr
39% more than the average Senior Software Engineer Salary in India
View more details

Paytm Senior Software Engineer Reviews and Ratings

based on 140 reviews

2.7/5

Rating in categories

3.1

Skill development

2.4

Work-life balance

2.6

Salary

2.0

Job security

2.3

Company culture

2.4

Promotions

2.7

Work satisfaction

Explore 140 Reviews and Ratings
Backend - Senior Software Engineer

Noida,

Bangalore / Bengaluru

3-5 Yrs

₹ 6-50 LPA

Explore more jobs
Team Lead
2k salaries
unlock blur

₹2 L/yr - ₹9.5 L/yr

Senior Software Engineer
1.5k salaries
unlock blur

₹11 L/yr - ₹38 L/yr

Software Engineer
1.4k salaries
unlock blur

₹6 L/yr - ₹21 L/yr

Sales Executive
985 salaries
unlock blur

₹0.9 L/yr - ₹5.3 L/yr

Senior Associate
958 salaries
unlock blur

₹2.2 L/yr - ₹9.1 L/yr

Explore more salaries
Compare Paytm with

BharatPe

3.5
Compare

Zerodha

4.2
Compare

Razorpay

3.6
Compare

Mobikwik

3.6
Compare
write
Share an Interview