McKinsey & Company Senior Software Engineer Interview Questions and Answers

They will ask some simple algorithmic questions.

Q1. Very friendly face to face interview simple questions will be asked base on your level of expertise
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1 hr test with questions on react and , js, python

This is a case study round, you would be given 3 question out of which you will need to solve any 2.
Two question are algoritm based around designing datastructure and matrix problem
One question will be based om designing Database for a given requirement.

Q1. This is a follow up round after case study,where the interviewer will ask you about perfomance and scalability of questions is case study round. There might be few addition question on improving the soluti...read more
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Q1. This is a behaviour round where interviewer will see your fitiness for team. It basically has scenario based question . This is also elimination round
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Multiple choice questions on language of your choice

Solve any 2 case studies out of 3.
2 classes design LLD.
1 SQL db design

Q1. Oop, DSA basic and medium level questions.
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Mix of coding, aptitude, java, javascript

Q1. Resume based questions on project
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Q2. Basic SQL, Java streams questions
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Q1. Project related questions
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Q2. Internal working of hashmap
Ans. 
HashMap is a data structure that stores key-value pairs and uses hashing to quickly retrieve values based on keys.
• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to determine the index in the array where the pair will be stored.

• If multiple keys hash to the same index, a collision occurs and the pairs are stored in a linked list at that index.

• To...read more
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Q3. Design patterns I've used
Ans. 
I have used design patterns such as Singleton, Factory, and Observer in my projects.
• Singleton pattern ensures a class has only one instance and provides a global point of access to it.

• Factory pattern creates objects without specifying the exact class of object that will be created.

• Observer pattern defines a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and
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Q4. Print whole Fibonacci series using recursion.
Ans. 
Print Fibonacci series using recursion
• Define a recursive function to calculate Fibonacci numbers

• Base case: return 0 if n is 0, return 1 if n is 1

• Recursive case: return sum of previous two Fibonacci numbers

• Print each Fibonacci number in the series
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Q5. Show my Github projects, and the interviewer didn't even properly looked into the code.
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