Blackrock Software Developer Intern Interview Questions, Process, and Tips

Q1. MULTIPLE QUESTIONS OF OOPS
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Q2. Program of prime number
Ans. 
A program to find prime numbers within a given range
• Iterate through numbers in the given range

• Check if each number is divisible by any number other than 1 and itself

• If not divisible, it is a prime number
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Q3. Pseudo code of finding ones in a number
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Count the number of ones in a given number using pseudo code
• Initialize a count variable to 0

• Iterate through each bit of the number and check if it is 1

• Increment the count if the bit is 1

• Return the count as the result
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Q4. Basic questions of sql and mongodb
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Aptitude test with different sections. Each section had its own time limit. Level - Moderate to difficult

Q1. Introduce yourself
Ans. 
I am a passionate software developer with experience in Java, Python, and web development.
• Experienced in Java and Python programming languages

• Proficient in web development technologies like HTML, CSS, and JavaScript

• Currently pursuing a degree in Computer Science
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Q2. Resume projects
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Q3. 2 DSA questions
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Q4. One SQL Query question
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Round duration - 60 Minutes
Round difficulty - Medium

This was a Technical round. About 60 students were shortlisted for this round. There were two interviewers. First, they asked me to introduce myself. Then I was asked some concepts of OOPS. some questions from OS and DBMS. I was asked to write code to reverse a link list on the notepad and share my screen. Then I was asked about my projects and internship. There were some situational questions related to the internship. They asked me what I know about the company.

My interview took place in the morning at around 10:00 a.m. and lasted for about an hour.

Q1. What is the difference between Python and C++?
Ans. 
Python is a high-level, interpreted language known for its simplicity and readability, while C++ is a low-level, compiled language known for its performance and efficiency.
• Python is dynamically typed, while C++ is statically typed.

• Python uses indentation for code blocks, while C++ uses curly braces.

• Python has automatic memory management, while C++ requires manual memory management.

• Python is slower in execution compared...read more
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Q2. 
Reverse Linked List Problem Statement
Given a singly linked list of integers, return the head of the reversed linked list.
Example:
Initial linked list: 1 -> 2 -> 3 -> 4 -> NULL
Reversed link...read more
Ans. 
Reverse a singly linked list of integers and return the head of the reversed linked list.
• Iterate through the linked list and reverse the pointers to point to the previous node instead of the next node.

• Use three pointers to keep track of the current, previous, and next nodes while reversing the linked list.

• Update the head of the reversed linked list as the last node encountered during the reversal process.
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Round duration - 30 Minutes
Round difficulty - Medium

It was a virtual interview and there was just one interviewer. The interviewer was really friendly. First of all, the interviewer introduced himself and also shared some facts about the company. Then he asked me to introduce myself. Then behavioral and situational questions were asked. Then he asked if I was comfortable with relocation. BlackRock has 2 locations that are Gurgaon and Mumbai.

Round duration - 90 Minutes
Round difficulty - Medium

Q1. You will be provided with SQL queries and code snippets along with their outputs or errors in the options. Can you analyze and determine the correct outputs or identify the errors?
Ans. 
Yes, I can analyze SQL queries and code snippets to determine correct outputs or errors.
• Understand the SQL syntax and logic to identify errors in queries.

• Check for syntax errors, missing or incorrect keywords, and data type mismatches.

• Analyze the code snippets to identify logical errors or potential bugs.

• Compare the expected output with the provided output to determine correctness.
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Round duration - 15 minutes
Round difficulty - Medium

Q1. What can you tell me about joins and indexing in database management systems?
Ans. 
Joins are used to combine rows from two or more tables based on a related column, while indexing is a technique to improve the performance of queries by creating a data structure that allows for quick lookup of data.
• Joins are used to retrieve data from multiple tables based on a related column, such as INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.

• Indexing involves creating data structures like B-trees or hash table...read more
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Round duration - 20 Minutes
Round difficulty - Medium