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Blackrock Software Developer Interview Questions, Process, and Tips
Top Blackrock Software Developer Interview Questions and Answers
- Q1. Greatest Common Divisor Problem Statement You are tasked with finding the greatest common divisor (GCD) of two given numbers 'X' and 'Y'. The GCD is defined as the large ...read more
- Q2. Ninja And The Triangle Problem Statement Ninja is provided with 'N' stars and the task is to construct a triangle such that the 'i'th level of the triangle uses 'i' numb ...read more
- Q3. Shortest Distance in a Binary Search Tree Your task is to determine the shortest distance between two nodes with given keys in a Binary Search Tree (BST). It is assured ...read more
Blackrock Software Developer Interview Experiences
5 interviews found
Anonymous
(2 Questions)
- Q1. Java questions , stream api
- Q2. Whatever you have mention in resume
Interview Preparation Tips
Jasleen Kaur
Selected
I applied via campus placement at Thapar Institute of Engineering and Technology (TIET) and was interviewed in Apr 2024. There were 3 interview rounds.
Aptitude, maths, cs fundamentals, dbms
(1 Question)
- Q1. Leetcode easy-medium
(1 Question)
- Q1. General questions
Interview Preparation Tips
I was interviewed in Jan 2022.
(3 Questions)
Round duration - 100 Minutes
Round difficulty - Hard
There were 2 interviewers. It started with an introduction from me and one of the interviewers directly started with a DSA questions. Two problems were asked and I had to code them on a compiler of my choice by sharing my screen. Level of DSA question was medium but I was severely grilled on oops. I had to create different abstract classes, interface and explain entire oops with examples.
This was followed by a set of core JAVA questions :
Difference between == and .equals() ?
Mention some methods of the object class?
Difference between TreeSet and SortedSet?
How is a String saved in JAVA?
difference between string pool and heap memory?
- Q1.
Shortest Distance in a Binary Search Tree
Your task is to determine the shortest distance between two nodes with given keys in a Binary Search Tree (BST).
It is assured that both keys exist within the BS...
- Ans.
I directly gave an approach to find the lowest common ancestor of the two nodes and then finding separate distances between the Ancestor node and the two nodes and returning the sum of the distances. I was then asked to code the whole solution which I correctly completed.
- Q2.
Greatest Common Divisor Problem Statement
You are tasked with finding the greatest common divisor (GCD) of two given numbers 'X' and 'Y'. The GCD is defined as the largest integer that divides both of the...
- Ans.
I was happy after seeing the question and coded it in 3 minutes using while loop. I was the asked to do it by recursion and i successfully did it but the catch here was to explain to the interviewer the entire memory management in heap and stack along with complexity solution.
- Q3.
Bridge in Graph Problem Statement
Given an undirected graph with V vertices and E edges, your task is to find all the bridges in this graph. A bridge is an edge that, when removed, increases the number of...
- Ans.
I solved it using o(e+v) algo and interviewers were very patient and helpful
Interview Preparation Tips
Tip 1 : Tree is the most important topic in BlackRock recruitment process.
Tip 2 : have atleast one live working project- host your project either on Heroku/Play Store.
Tip 3 : Practice atleast 100 leetcode medium questions.
Tip 1 : Don't oversell yourself because interviewers will grind you on everything that you write in resume.
Tip 2 : Mention links to your project.
Skills evaluated in this interview
I was interviewed before Jun 2021.
Round duration - 90 Minutes
Round difficulty - Medium
(1 Question)
Round duration - 60 Minutes
Round difficulty - Medium
- Q1.
Validate Binary Search Tree Problem Statement
Your task is to determine if a given binary tree with 'N' nodes is a valid Binary Search Tree (BST). A BST is defined by the following properties:
- The lef...
- Ans.
Step 1 : gave most optimized approach
Step 2 : interviewer asked to write the code
Round duration - 60 Minutes
Round difficulty - Easy
Interview Preparation Tips
Tip 1 : Pratice regularly atleast 5 problem . Make it habit .Try to cover Leetcode medium questions as many as possible
Tip 2 : Be through with your projects . At some point interviewer will ask you some project related questions
Tip 3 : Be strong in your CS fundamentals.
Tip 1 : Do not put irrelevant information such as DOB
Tip 2 : Put only those skill which you can defend in cross questioning
Skills evaluated in this interview
Blackrock interview questions for designations
I was interviewed before Dec 2020.
(1 Question)
Round duration - 87 minutes
Round difficulty - Medium
Timing : It was conducted in evening at 3 PM
The pacreception environment was very user friendly .
The platform was audio and video proctored.
- Q1.
Binary to Decimal Conversion
Convert a given binary number, represented as a string 'S' of size 'N', into its decimal equivalent integer and output it.
Input:
The first line contains an integer 'T', den... - Ans. Approach
The idea here is to keep a variable ‘value’ for storing the decimal value. We start traversing the string from the end and for each digit multiply the digit with the proper power of 2 and add it to the variable ‘value’ and after complete traversal of the string return the variable ‘value’.
Algorithm:
- Let the given string be ‘S’ of size ‘N’.
- Declare a variable ‘baseVal’ and initialize it’s value t...
(1 Question)
Round duration - 80 minutes
Round difficulty - Medium
So This was a very interactive round . There were two interviewers , one male and one female . The male interviewer was quite experienced where as female interviewer was relatively new . The Interview started by a small introduction followed by some OOPS related questions where I was tested on how i perceive the concept of OOPS in real life . Then this conversation was followed by some core concepts of JAVA like abstract classes and interfaces . Then I was asked about my projects that i mentioned in my resume , then after some healthy discussion on those projects , the interviewer started to question about DBMS , I was asked some basic queries followed by some advanced queries and then followed by a discussion on SQL vs NoSQL . Then Interviewers asked me about my tech stack and the source of my technical knowledge. Then at last I was asked that why Blackrock and this concluded my Interview.
- Q1.
Ninja And The Triangle Problem Statement
Ninja is provided with 'N' stars and the task is to construct a triangle such that the 'i'th level of the triangle uses 'i' number of stars. The goal is to make th...
- Ans. Brute Force
We know that the ‘i’th’ level of a triangle contains ‘i’ number of stars. So we can start making the triangle from top to bottom. If we have enough stars, then we make the next level of the triangle. Otherwise, we stop and return the number levels made so far.
Here is the algorithm:
- We declare a variable ‘maxHeight’ and ‘numberOfStars’ in which we store the maximum height of the triangle that we ca...
Interview Preparation Tips
Tip 1 : Be precise about what to do and what not to do.
Tip 2 : Always Revise the concepts you have done in past , use prime day revision theory.
Tip 3 : Do as many projects as you can but always mention those projects in which you are very well versed.
Tip 4 : Keep on reading random news related to your favourite tech and always have an in depth knowledge of what tech you currently use.
Tip 1 : Keep it short , precise and effective .
Tip 2 : Mention even small things that you did had an impact on other people.
Skills evaluated in this interview
Get interview-ready with Top Blackrock Interview Questions
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Interview questions from similar companies
Sonug Gupta
(5 Questions)
- Q1. No any no any questions for sharing.
- Q2. Nothing questions for sharing
- Q3. Nothing to share have for interview
- Q4. Nothing to share for interview
- Q5. Nothing have to sharing
Interview Preparation Tips
I applied via LinkedIn and was interviewed in Sep 2024. There were 2 interview rounds.
(2 Questions)
- Q1. Plugin pipeline based scenario question which will trigger first?
- Q2. Which jscript method used to prevent form save??
- Ans.
The onbeforeunload method is used to prevent form save.
Use the onbeforeunload method to display a warning message before leaving the page without saving the form.
Return a custom message in the method to prompt the user to confirm if they want to leave the page.
Example: window.onbeforeunload = function() { return 'Are you sure you want to leave this page without saving?'; };
(2 Questions)
- Q1. Behavioral interview
- Q2. Package negotiations
Interview Preparation Tips
Skills evaluated in this interview
I applied via Naukri.com
(2 Questions)
- Q1. Write a java program to sort an array
- Ans.
Java program to sort an array of strings
Use Arrays.sort() method to sort the array of strings
Import java.util.Arrays package
Example: String[] arr = {"apple", "banana", "orange"}; Arrays.sort(arr);
- Q2. Collections in java and springboot
- Ans.
Collections in Java and Spring Boot are used to store and manipulate groups of objects.
Collections in Java are used to store multiple objects in a single unit.
Spring Boot provides support for managing collections through various data structures like List, Set, Map, etc.
Collections in Java and Spring Boot help in organizing and manipulating data efficiently.
Example: List
names = new ArrayList<>();
Skills evaluated in this interview
Selected
I applied via Naukri.com and was interviewed in Jun 2024. There were 2 interview rounds.
(2 Questions)
- Q1. Basic Java questions
- Q2. Spring, Spring boot basics
(2 Questions)
- Q1. Microservices Communications
- Q2. Project level experiences
Selected
I applied via Job Portal and was interviewed in Jul 2024. There was 1 interview round.
(2 Questions)
- Q1. What is dom? in javaScript
- Ans.
DOM stands for Document Object Model. It is a programming interface for web documents that allows scripts to dynamically access and update the content, structure, and style of a webpage.
DOM is a tree-like structure that represents the elements of an HTML document.
It allows developers to manipulate the content and structure of a webpage using JavaScript.
Example: document.getElementById('myElement') allows you to access
- Q2. What is virtual dom in react js
- Ans.
Virtual DOM is a lightweight copy of the actual DOM in React.js, used for efficient updates and rendering.
Virtual DOM is a concept where a lightweight copy of the actual DOM is maintained by React.js.
It allows React to efficiently update and render components by comparing the virtual DOM with the actual DOM.
When changes are made to the virtual DOM, React calculates the most efficient way to update the actual DOM.
This h...
Skills evaluated in this interview
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Blackrock Software Developer Interview Process
based on 2 interviews
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Blackrock Software Developer Reviews and Ratings
based on 6 reviews
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Analyst
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Associate
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| ₹10 L/yr - ₹22 L/yr |
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