McKinsey & Company Junior Engineer Interview Questions and Answers for Freshers

There were 2 DSA questions that we had to solve on HackerRank. One of them was a medium dynamic programming question - minimum insertions required to make a string palindrome. The other was a fairly easy question that required knowledge of permutations and combinations. We just had to figure out a maths formula given the situation.
1st round also involved a logical game that we had to play. We were scored based on coding + game and shortlisted for next round.

An interviewer joined me on zoom meet and sent a HackerRank link to a question. It was a medium dynamic programming/backtracking question. I solved it but only half the test cases ran while others threw TLE as my recursive code took exponential time.

• Q1. Explain what happens after you search a url on your browser. (Had to explain the whole DNS working)
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• Q2. Explain how video calling works. (Had to explain the whole OSI model)
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• Q3. Asked possible causes of ClassNotFoundException and MemoryOutOfBoundException
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• Q4. Asked 2 or 3 case study questions like designing a car infotainment system.
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• Q5. Asked about the usefulness of OOPS.
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• Q6. Asked how Java code compiles/runs(had to explain about creation of class file, JVM etc)
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• Q7. Asked about working of https.
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• Q1. Explain few challenges that you faced during a project/internship.
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• Q2. Where do you see yourself in 5 years?
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• Q3. Explain a project that you did
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• Q4. Tell me about a conflict that you may have faced during a project/internship
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