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Software Engineer Principal Interview Questions

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2,048 software engineer principal interview questions shared by candidates

1st Round : Design an API Limiter. Discuss all approaches and write code Deep diving into code & cons of the algorithm Create LLD for the printer driver. Discuss design patterns and code sharing. Question regarding the last project you have worked upon. Code sharing 2nd Round: Architecture of Previous Projects Twitter Design : Feed Generation Data caching Data sharding Table design Scaling, Load balancer algorithm, Consistent Hashing, Service Registry, Application scaling Leader selection algorithm ( Zookeeper & Kafka working) Basically covered everything in backend development. I got tired after 1.5 hour 3rd Round : Behavior questions CI/CD model Leadership questions Failures in life & Past mistakes Encoding, Encryption, Salting, Hashing How to hide passwords & OTP from hackers. I got call from HR that they want to offer
avatar

Principal Software Engineer

Interviewed at Treebo Hotels

3.7★
Nov 29, 2020

1st Round : Design an API Limiter. Discuss all approaches and write code Deep diving into code & cons of the algorithm Create LLD for the printer driver. Discuss design patterns and code sharing. Question regarding the last project you have worked upon. Code sharing 2nd Round: Architecture of Previous Projects Twitter Design : Feed Generation Data caching Data sharding Table design Scaling, Load balancer algorithm, Consistent Hashing, Service Registry, Application scaling Leader selection algorithm ( Zookeeper & Kafka working) Basically covered everything in backend development. I got tired after 1.5 hour 3rd Round : Behavior questions CI/CD model Leadership questions Failures in life & Past mistakes Encoding, Encryption, Salting, Hashing How to hide passwords & OTP from hackers. I got call from HR that they want to offer

Asked string to print in reverse order - dont use any in built c# method. then I started using length and he said dont use length also ;-) Mocking Solid principle's I and D - which he thinks I expect me to say about Inversion of Controls (one of most intelligent interviewer, I have seen and I think he is thinking that he is an ex-Amazon, ex-Microsoft guy or may this was he was taking interview first time) There are some classes in my submitted problem statement which does not implement interface as they were supporting classes and I dont have time for these guys to write test cases for those classes. He was asking why ahy you have not written test case ..how we can test.. you annoying joker do you have any project in which you have written 100% code coverage?
avatar

Principal Software Engineer

Interviewed at Nuance

4★
Jul 11, 2020

Asked string to print in reverse order - dont use any in built c# method. then I started using length and he said dont use length also ;-) Mocking Solid principle's I and D - which he thinks I expect me to say about Inversion of Controls (one of most intelligent interviewer, I have seen and I think he is thinking that he is an ex-Amazon, ex-Microsoft guy or may this was he was taking interview first time) There are some classes in my submitted problem statement which does not implement interface as they were supporting classes and I dont have time for these guys to write test cases for those classes. He was asking why ahy you have not written test case ..how we can test.. you annoying joker do you have any project in which you have written 100% code coverage?

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