Paytm Senior Software Development Engineer Interview Questions and Answers

Q1. Design patterns
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Q2. Design principles
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Q1. Spring in depth
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Spring is a powerful and lightweight framework for building Java applications.
• Spring provides comprehensive infrastructure support for developing Java applications.

• It promotes good design practices such as dependency injection and aspect-oriented programming.

• Spring Boot simplifies the setup and configuration of Spring applications.

• Spring MVC is a popular module for building web applications.

• Spring Data JPA simplifies d...read more
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Q2. Java 8 in deptg
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Java 8 introduced new features like lambda expressions, streams, and functional interfaces.
• Lambda expressions allow for more concise code and easier parallel programming.

• Streams provide a way to work with collections in a functional style.

• Functional interfaces can have only one abstract method and are used for lambda expressions.

• Optional class helps to avoid NullPointerExceptions.

• Default methods allow interfaces to hav...read more
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Q1. Related to your project, core java
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Q2. Spring boot, database.
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A test that covers all fundamental topics, including networking, object-oriented programming (OOP), and data structures and algorithms (DSA).

Q1. Write code for quick sort
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Q2. Puzzle
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Data structures and algo. 2 ques were asked in hackerrank

Q1. Questions related to System design
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Q1. Basic question related to Spring and Java
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Write code for advance surrying in js

Implement custom hook for api call

Q1. Basic questions arounf my previous work
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Q2. Technical questions around performance and code optimization
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MCQ type questions related to Front end, Back end and involved few coding questions in the MCQ format

Q1. How would you debug an application to solve a production defect that was raised?
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I would start by reproducing the issue, analyzing logs, checking code changes, and using debugging tools.
• Reproduce the issue to understand the exact scenario where the defect occurs.

• Analyze logs to identify any error messages or warnings related to the defect.

• Check recent code changes to see if any recent modifications could have caused the defect.

• Use debugging tools like breakpoints, logging, and profiling to trace th...read more
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Q2. What would you do if a defect can't be fixed?
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I would analyze the impact of the defect and explore alternative solutions.
• Analyze the impact of the defect on the overall system functionality

• Discuss with the team to brainstorm alternative solutions

• Consider workarounds or temporary fixes while a permanent solution is being developed
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Q3. How would you implement breaking changes in the application?
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Breaking changes can be implemented by following a structured process to minimize impact on users.
• Communicate the changes to stakeholders in advance

• Provide detailed documentation on the changes and how to adapt to them

• Implement versioning to allow users to choose when to adopt the changes

• Use feature flags to gradually roll out the changes and monitor impact

• Run thorough testing to ensure the changes do not introduce new
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Q1. One leetcode easy-medium problem
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Q2. Java, springboot and oops question
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Q1. Project related questions
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Q2. System design questions
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You should be familiar with core java features. Collections, converting one collection Array / Vector to other. Removing duplicates. Lambda chaining / Functional programming. Basic SQL - Joins, Aggregates etc.

Q1. Explain Architecture of applications you worked on. Justify use of components. System Design questions.
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