Visteon Senior Software Engineer Interview Questions and Answers

Q1. Find longest palindromic substring in a given string.
Ans. 
Use dynamic programming to find the longest palindromic substring in a given string.
• Iterate through the string and expand around each character to find palindromes.

• Store the length of the longest palindrome found so far.

• Return the substring based on the start and end indices of the longest palindrome.
Answered by AI
Add your answer
Q2. How to serialize and deserialise a tree
Ans. 
To serialize and deserialize a tree, use a recursive approach to traverse the tree and store the data in a suitable format.
• Use pre-order traversal to serialize the tree by storing the node values in a list or string.

• For deserialization, reconstruct the tree by recursively building nodes from the serialized data.

• Consider using JSON or XML format for serialization to easily store and retrieve tree structure.
Answered by AI
Add your answer
Q3. Find if a given regex (containing ., * and lower case english chars) matches a given string.
Ans. 
Use regex library to match given regex with string.
• Use a regex library like re in Python to match the given regex with the string.

• Check if the regex matches the string using the library functions.

• Handle cases where the regex contains special characters like . and * appropriately.
Answered by AI
Add your answer
Q4. Explain about throttling and implement throttle function.
Ans. 
Throttling is a technique used to control the rate of requests sent to a server.
• Throttling helps prevent server overload by limiting the number of requests processed at a time.

• Implementing a throttle function involves setting a maximum request rate and delaying excess requests.

• Example: Implementing a throttle function in a web application to limit the number of API calls made to a third-party service.

• Example: Throttlin...read more
Answered by AI
Add your answer

Q1. Find squares of elements in a sorted array and return the sorted response.
Ans. 
Sort the squares of elements in a sorted array and return the sorted response.
• Iterate through the array and square each element.

• Store the squared values in a new array.

• Sort the new array and return it.
Answered by AI
Add your answer
Q2. Write a short promise example and implement your own promise
Ans. 
A promise is a commitment to do something in the future, typically used for asynchronous operations in JavaScript.
• Promises are used to handle asynchronous operations in JavaScript.

• They represent a value that may be available now, in the future, or never.

• Promises have three states: pending, fulfilled, or rejected.

• Example: new Promise((resolve, reject) => { setTimeout(() => resolve('Done!'), 1000); });
Answered by AI
Add your answer
Q3. Explain event loop, what are different types of queues in event loop
Ans. 
Event loop is a mechanism that allows for asynchronous execution of code by managing the order of events in a single thread.
• Event loop continuously checks the call stack for any functions that need to be executed, and processes them in a non-blocking manner.

• Different types of queues in event loop include microtask queue (Promise callbacks), macrotask queue (setTimeout, setInterval callbacks), and animation frame queue
Answered by AI
Add your answer
Q4. What is virtual DOM and why its faster
Ans. 
Virtual DOM is a lightweight copy of the actual DOM, used to improve performance by minimizing direct manipulation of the real DOM.
• Virtual DOM is a concept used in frameworks like React to optimize rendering performance.

• Changes are first made to the virtual DOM, which is then compared to the real DOM to identify the minimal updates needed.

• This approach reduces the number of actual DOM manipulations, resulting in faster...read more
Answered by AI
Add your answer

Q1. Reverse the linked list.
Add your answer

Q1. Internel working of Hashmap
Add your answer

Q1. Salary Discussion
Add your answer

DSA round leetcode style question

Q1. Design + Coding round for rate limiter
Add your answer

Q1. Tell me about your experience?
Ans. 
I have over 8 years of experience in software development, specializing in backend systems and database management.
• Developed scalable backend systems using Java and Spring framework

• Designed and optimized database schemas for performance

• Led a team of developers in implementing new features and resolving technical issues

• Worked on integrating third-party APIs for enhanced functionality
Answered by AI
Add your answer
Q2. Asked deeply on my current project?
Add your answer
Q3. What are difficulties you faced in your work?
Ans. 
Difficulties faced include complex technical challenges, tight deadlines, and communication issues.
• Complex technical challenges such as optimizing performance of a large-scale system

• Tight deadlines requiring quick turnaround on projects

• Communication issues with team members or stakeholders leading to misunderstandings
Answered by AI
Add your answer

Q1. Palindrome check for strings
Ans. 
Check if a string is a palindrome
• Iterate through each string in the array

• For each string, compare characters from start and end to check if it's a palindrome

• Return true if all strings are palindromes, false otherwise
Answered by AI
Add your answer
Q2. Basic java programming questions
Add your answer

Q1. Selenium test automation frameworks
Add your answer
Q2. Different types of automation frameworks used
Ans. 
Various automation frameworks like keyword-driven, data-driven, hybrid, and behavior-driven are commonly used in software testing.
• Keyword-driven framework: Tests are written using keywords and actions.

• Data-driven framework: Tests are driven by data sets.

• Hybrid framework: Combination of multiple frameworks.

• Behavior-driven framework: Focuses on behavior of the system.

• Page Object Model (POM): Organizes code by separating
Answered by AI
Add your answer

Q1. Difference between abstract class and interface?
Add your answer
Q2. Explain OOP in C#?
Add your answer

Q1. Large scale system design interview
Add your answer

Two DSA questions related to Arrays & strings

Q1. Design URL shortener
Ans. 
Design a URL shortener service with features like shortening, redirecting, tracking, handling collisions, and providing analytics.
• Use a hashing algorithm to generate unique short URLs from long URLs

• Store mappings of short URLs to original URLs in a database

• Implement a redirect mechanism to direct users to the original URL when accessing the short URL

• Track the number of times each short URL is accessed and store this da...read more
Answered by AI
Add your answer

Q1. 2 DSA questions
Add your answer

Q1. Half an hour of behavioral questions and 1 DSA question
Add your answer

Q1. One hour discussion of the work that I have done till now
Add your answer

Q1. 1 Hard DSA question
Add your answer

Q1. 1 Hard DSA question
Add your answer

Q1. Design round for HLD
Add your answer