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Lead Application Developer Interview Questions

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10,344 lead application developer 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.

PLC questions How to calculate cycle time ? Effect of derivative term in PID? How do you tune PID ? How you do Time based logic in PLC? (like every day 11 PM some action has to happen) What are the basic requirements before developing the PLC applications? How much comfortable you are with IEC61131-3 languages ? What is watch dog timer ? SCADA questions What is P&ID? Draw all the symbols you familiar in P&ID and explain ? How you differentiate signal to PLC in a P&ID diagram ? Instrumenation 2 wire Vs 4 Wire Transducer Vs Sensor PLC Vs Safety PLC How to do calibration ? RTD Vs TC RTD measurement ranges ? and different types 1?What would be the OP of RTD signal range TC measurement ranges ? and different types?What would be the OP of TC and signal range
avatar

Application-Project Engineer

Interviewed at Siemens

4.1★
May 10, 2014

PLC questions How to calculate cycle time ? Effect of derivative term in PID? How do you tune PID ? How you do Time based logic in PLC? (like every day 11 PM some action has to happen) What are the basic requirements before developing the PLC applications? How much comfortable you are with IEC61131-3 languages ? What is watch dog timer ? SCADA questions What is P&ID? Draw all the symbols you familiar in P&ID and explain ? How you differentiate signal to PLC in a P&ID diagram ? Instrumenation 2 wire Vs 4 Wire Transducer Vs Sensor PLC Vs Safety PLC How to do calibration ? RTD Vs TC RTD measurement ranges ? and different types 1?What would be the OP of RTD signal range TC measurement ranges ? and different types?What would be the OP of TC and signal range

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