Got the offer

Sr Software Engineer at Paytm

How it went

Be ready to explain every project you have worked on, think about why you chose certain patterns, frameworks, or databases, interviewers will ask reasoning.

What they would tell you

Be ready to explain every project you have worked on, think about why you chose certain patterns, frameworks, or databases, interviewers will ask reasoning.

How to prepare

Their background

The interview process consisted of four rounds.

Round by round

1
Technical Round 160 min
1st Round technical discussion combined with DSA. It began with introductions and about my projects, where I explained my tech stack, my contributions, tech stack. The interviewer then asked a basic DP problem, I was also asked some Java questions
2
Technical Round 260 min
It consisted of two questions I don’t recall the exact question but sharing little bit similar ones
- Sum of Subarray Minimums
- Longest Palindromic Substring
3
Technical Round 360 min
Discussion about my recent backend projects architecture, tech stack i used, & scaling challenges faced. Design Patterns: Explain the Singleton pattern and how to make it thread-safe in Java. When would you use the Observer pattern? Give a real example. Discuss Factory and Strategy patterns in Spring Boot contexts. SQL: How would you optimize a query joining four large tables? The interviewer also asked questions on Spring Boot concepts and Java
4
HLD60 min
Design a real-time fraud detection system for online transactions.

What came up

MediumRemote3 4 years

A candidate-reported account, lightly edited. Interview processes change by team and date.

Sources

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