Volvo Software Developer Interview Questions and Answers

First Round was Aptitude and coding round. It consist 70 question, 30 aptitude question and 40 mcq type coding question

Q1. Find the one repeated number in an array and asked for four approaches
Ans. 
Find the one repeated number in an array using four different approaches.
• Approach 1: Using a hash set to store unique elements and checking for duplicates

• Approach 2: Sorting the array and checking adjacent elements for duplicates

• Approach 3: Using XOR operation to find the repeated number

• Approach 4: Using the sum formula to find the repeated number
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Q2. Simple sql queries
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Q1. Java 8 questions. What is lambda function.
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Q2. Given an array use Java 8 feature to sum all no and give output
Ans. 
Sum all numbers in an array using Java 8 features.
• Use the stream() method to convert the array into a stream of elements.

• Use the mapToInt() method to convert the stream of elements into a stream of integers.

• Use the sum() method to calculate the sum of all integers in the stream.
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Q3. Second largest element in an array
Ans. 
Find the second largest element in an array of strings.
• Sort the array in descending order

• Return the element at index 1
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Maximum some in an array

Quantitative, verbal

2 coding questions easy, medium

Q1. SQL queries, java, oops
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Q2. Projects resume
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2 leetcode easy questions

Q1. An hour interview with hiring managers
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Duration : 1 hour
Topics : Java and DSA

Q1. Linked List, Stack and Queue
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Q2. BFS vs DFS. Graph Traversal
Ans. 
BFS explores neighbors before moving to next level, while DFS explores as far as possible before backtracking.
• BFS uses a queue to keep track of nodes to visit next, while DFS uses a stack or recursion.

• BFS is optimal for finding shortest path in unweighted graphs, while DFS is more memory efficient.

• BFS is typically implemented iteratively, while DFS can be implemented recursively.

• Example: BFS is used in level order trav...read more
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Q1. Why do you want to join us
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Q2. Where do you see yourself in next 5 years.
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Q1. Which language you will code
Ans. 
I am proficient in coding in multiple languages including Java, Python, and JavaScript.
• Java

• Python

• JavaScript
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Q2. Dsa topics in java
Ans. 
Data Structures and Algorithms topics commonly used in Java programming.
• Arrays and ArrayLists

• Linked Lists

• Stacks and Queues

• Trees and Graphs

• Sorting and Searching algorithms

• Dynamic Programming

• Hashing and Hashmaps
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Q1. About yourself and introduce
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Q1. When should we use node js and java
Ans. 
Node.js is suitable for real-time applications and microservices, while Java is better for large-scale enterprise applications.
• Use Node.js for building real-time applications like chat apps, streaming services, and collaborative tools.

• Node.js is also great for developing microservices and APIs due to its lightweight and event-driven architecture.

• Java is ideal for building large-scale enterprise applications that requir...read more
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Explain programming languages you have experience with, explain how you would design a banking app

Behavioral test to see how you respond to different situations