PhonePe Senior Sdet Software Engineer Interview Questions and Answers

Data structure and algo questions from leetcode

Machine coding assignment

Q1. Design Content Delivery Network
Ans. 
Designing a Content Delivery Network (CDN) for efficient content distribution.
• Identify target audience and content types

• Select appropriate CDN providers based on needs (e.g. Akamai, Cloudflare)

• Implement caching strategies for static and dynamic content

• Optimize network routing for faster delivery

• Monitor performance and adjust as needed
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Q2. Design notification service
Ans. 
Design a notification service for sending alerts to users.
• Identify types of notifications (email, SMS, push notifications)

• Implement a notification queue to handle high volume of notifications

• Allow users to customize notification preferences

• Include monitoring and logging for tracking delivery status

• Consider scalability and reliability of the service
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Regex generator- used dp

Asked program for reverse string

Good technical round with string question

Good technical round with automation testing questions

Automation question put to solve using appium

Had questions on graph

Q1. Binary Search leftmost rightmost
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Q1. Monotonic stack question
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Q1. System design round, discussed subscriber publisher design pattern
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Q1. LinkedList / Tree
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Q2. DP - Recursion - PnC
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Q1. Projects , Last Exp
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Aptitude questions to be asked in this round

Write a Java program to sort array in ascending order

2 Coding problem. Need to solve with complexity in mind.

Q1. Testing and Automation Acumen: Asked about automation testing framework. Various discussions and question around. Asked to write testcases in a scenario. Given multiple upstream and downstream services.
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Q2. Best time to buy or sell stock.
Ans. 
The best time to buy or sell stock depends on various factors such as market conditions, company performance, and personal financial goals.
• Consider buying stocks when the market is down and selling when it is up to maximize profits.

• Research the company's financial health, growth potential, and industry trends before making a decision.

• Set clear investment goals and risk tolerance to determine the best time to buy or sel...read more
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Q3. Validate Parenthesis
Ans. 
Validate if a given string of parentheses is valid or not
• Use a stack to keep track of opening parentheses

• Pop from stack when encountering a closing parenthesis

• Return false if stack is not empty at the end
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Q4. Write testcases on A-->B-->C microservices. Integration testcases.
Ans. 
Write integration testcases for A-->B-->C microservices
• Test the communication between A and B microservices

• Test the data flow from B to C microservices

• Verify the response of C microservice based on input from A

• Check for error handling and edge cases in the integration flow
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Manager Round there were two people in the call. Asked me about technologies I worked.
Various challenges faced in the automation.
Discussed on life goals.