PayU Payments Senior Software Engineer Interview Questions and Answers

Q1. Normal java and sql question
Add your answer

Q1. Sping boot and microservice
Add your answer

It was about DS Algo and Java garbage collection,multithreading

Q1. Low level design of rate limiter
Ans. 
Rate limiter is a system that controls the rate of traffic sent or received by a network interface.
• Implement a token bucket algorithm to track and limit the rate of requests

• Use a sliding window algorithm to track the number of requests within a specific time frame

• Consider using a distributed rate limiter for scalability and fault tolerance
Answered by AI
Add your answer
Q2. Springboot basics, java basics, future interfaces, basic sql queries
Add your answer

Online test link given data structures were asked, array problem and string problem
Likewise Double Linked List was also asked

Q1. Spring boot API endpoint description
Ans. 
Spring Boot API endpoint is a URL that exposes the functionality of a web service.
• API endpoints are the entry points for the client to access the server's resources.

• Spring Boot provides a simple and easy way to create RESTful APIs.

• Endpoints can be secured using Spring Security.

• Endpoints can be documented using Swagger or Spring REST Docs.

• Examples: /users, /products, /orders
Answered by AI
Add your answer
Q2. CI CD pipeline, Docker Kubernetes
Add your answer

Hacker rank test based on string manipulation questions

Q1. 2nd round will be technical
Add your answer
Q2. Yes mostly coding and DS questions you can also expect one logical IQ question
Add your answer

Q1. This round was mostly behavioural and culture fit round with Manager
Add your answer

Q1. Salary negotiation
Add your answer
Q2. Notice period discussions
Add your answer

DSA round on graph . String questions were asked

Online assessment and coding test

Q1. System Design related question to understand e2e picture of a working system in prod.
Add your answer
Q2. DS-Algo based question not remember now, but easy one
Add your answer

Q1. Prior project based System Design and questions around it
Add your answer
Q2. Design a custom data structure based on requirement
Ans. 
Custom data structure for array of strings
• Use a trie data structure to efficiently store and search for strings

• Implement methods for adding, removing, and searching for strings in the trie

• Consider optimizing the trie for memory usage and performance
Answered by AI
Add your answer
Q3. Internal working - of DB structures and indices etc
Ans. 
Understanding internal workings of DB structures and indices is crucial for optimizing database performance.
• DB structures refer to how data is organized within a database, such as tables, columns, and relationships.

• Indices are data structures that improve the speed of data retrieval operations by providing quick access to specific data values.

• Understanding how indices work can help in optimizing query performance by re...read more
Answered by AI
Add your answer

Q1. Past Experience based questions
Add your answer
Q2. Behavioral/Attitude observational Questions
Add your answer