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Product Applications Engineer Interview Questions

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25,297 product applications engineer interview questions shared by candidates

In round 1, they asked me a basic dsa question - Top K elements, which was done easily by heaps, while telling my answer the interviewer dived further into heaps and asked some basic questions, another question was also asked about prefix sum in an array. In round 2, I was asked everything about my resume and my projects, I was asked to write an SQL query as it was written in my resume and REST API, HTTP requests, header format. Further I was asked about basic things like docker, JWT authentication and everything about my project. In round 3, very basic questions were asked but regarding AI&ML this time, they asked me about LLMs, bias, vector indexes, regression equation and why are they needed.
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Application Engineer

Interviewed at IDFC FIRST Bank

4.1★
Oct 13, 2025

In round 1, they asked me a basic dsa question - Top K elements, which was done easily by heaps, while telling my answer the interviewer dived further into heaps and asked some basic questions, another question was also asked about prefix sum in an array. In round 2, I was asked everything about my resume and my projects, I was asked to write an SQL query as it was written in my resume and REST API, HTTP requests, header format. Further I was asked about basic things like docker, JWT authentication and everything about my project. In round 3, very basic questions were asked but regarding AI&ML this time, they asked me about LLMs, bias, vector indexes, regression equation and why are they needed.

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