Morningstar Site Reliability Engineer Interview Questions and Answers

90 minutes
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Q1. What is data structure ?
Ans. 
Data structure is a way of organizing and storing data in a computer so that it can be accessed and used efficiently.
• Data structures are used to manage large amounts of data efficiently.

• They provide a way to organize data in a way that makes it easy to access and manipulate.

• Examples of data structures include arrays, linked lists, stacks, queues, trees, and graphs.
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Q2. What is linked list?
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A linked list is a linear data structure where each element is a separate object with a pointer to the next element.
• Consists of nodes that contain data and a pointer to the next node

• Can be singly or doubly linked

• Used for dynamic memory allocation, implementing stacks and queues

• Example: Singly linked list - 1 -> 2 -> 3 -> null

• Example: Doubly linked list - null <- 1 <-> 2 <-> 3 -> null
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Q1. Tell me about yourself
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Q2. Tell me about your project
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Q1. 1. Question on Projects, Job, Contribution.
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Q2. Javascript : closures, promise
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Q3. Guess Output based questions
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Q4. Coding : Given array and target, find the index pair of elements the sum becomes target
Ans. 
Given an array and target, find the index pair of elements the sum becomes target.
• Use a hash table to store the difference between target and current element

• Check if the difference exists in the hash table

• Return the indices of the current element and the difference
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Thirty minutes,basic aptitude concepts

One hour and basic programmming concepts

Q1. Tell me about yourself
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Q2. Whats are your strengths
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Q3. What are your weakness
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Q4. Your techniclal skills
Ans. 
Proficient in programming languages such as Java, Python, and C++, as well as experience with databases and web development.
• Strong knowledge of Java, Python, and C++ programming languages

• Experience with databases such as MySQL and MongoDB

• Familiarity with web development technologies like HTML, CSS, and JavaScript
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Q5. Tell me about your project
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Simple coding questions for 1 hour duration

Q1. Coding question about graph data structure
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Q2. Implementation of hashmap using OOPS
Ans. 
Implementing hashmap using OOPS involves creating a class with key-value pairs and methods for adding, retrieving, and deleting entries.
• Create a class with private data members for storing key-value pairs

• Implement methods for adding a key-value pair, retrieving a value by key, and deleting a key-value pair

• Use hashing function to map keys to indices in an array for efficient retrieval

• Handle collisions by using technique
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It had 3 questions, the level was medium hardish

Q1. There were 3 rounds of interviews, 2 technical and 1 HR, ln First round I was asked about OOPs, 2 medium level DSA questions, asked to write code on paper and explain the approach. Questions: 1. Given an ...read more
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Write code to return the maximum profit by buying and selling stocks using available money

Basic array and vectors DSA questions

Q1. Asked me about my past project and my contribution in it
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Q2. Linux commands and c++ language control
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Q3. Asked me to write last function i wrote and explain what it does
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Q1. Asked me about my past projects and my contribution
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Q2. Checked my work ethics
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Q1. Basic hr questions
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Q2. Salary negotiation
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Q1. Oops concepts in java
Ans. 
Oops concepts in Java refer to Object-Oriented Programming principles like Inheritance, Polymorphism, Encapsulation, and Abstraction.
• Inheritance: Allows a class to inherit properties and behavior from another class.

• Polymorphism: Allows objects to be treated as instances of their parent class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Abstraction: Hides the implementation detail...read more
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