3M Data Engineer Interview Questions and Answers

Q1. Salary expectation .
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Q2. Why should I hire you?
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Q1. Mendix Advanced questions.
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Q2. Everything which you mentioned in your resume.
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Q1. General questions
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Q2. Related to work profile
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Q1. Technical question related to your work experience
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Q1. About your work experience
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Q1. Discussion about salary and company policies
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Round duration - 30. minutes
Round difficulty - Easy

It was in the evening, question were moderate

Q1. 
Count Subsequences Problem Statement
Given an integer array ARR of size N, your task is to find the total number of subsequences in which all elements are equal.
Explanation:
A subsequence of an array i...read more
Ans. 
Count the total number of subsequences in which all elements are equal in an integer array.
• Iterate through the array and count the frequency of each element.

• Calculate the total number of subsequences for each element using the formula (frequency * (frequency + 1) / 2).

• Sum up the total number of subsequences for all elements and return the result modulo 10^9 + 7.
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Round duration - 30 minutes
Round difficulty - Easy

It was in the night around 9:00 PM.

Q1. 
Pair Sum Problem Statement
You are given an integer array 'ARR' of size 'N' and an integer 'S'. Your task is to find and return a list of all pairs of elements where each sum of a pair equals 'S'.
Note:
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Ans. 
Given an array and a target sum, find all pairs of elements that add up to the target sum.
• Iterate through the array and for each element, check if the complement (target sum - current element) exists in a hash set.

• If the complement exists, add the pair to the result list.

• Sort the pairs based on the first element and then the second element.

• Return the list of pairs as the final result.
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Q1. Previous experience in technical knowledge
Ans. 
I have over 10 years of experience in various technical roles, including software development, system architecture, and project management.
• 10+ years of experience in technical roles

• Strong background in software development

• Experience in system architecture and project management
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Q1. Salary discussion
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