Kroll Software 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?
Ans. 
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