Vistaar Technologies Senior Software Engineer Interview Questions and Answers

Invert the bits of a given number

• Use bitwise XOR operator (^) with 1 to flip each bit

• Repeat the process for all bits in the number

• Return the inverted number

Backward compatibility can be supported by using versioning, deprecation strategies, and maintaining clear communication with users.

• Use versioning to clearly distinguish between different versions of the system

• Implement deprecation strategies to phase out old features gradually

• Maintain clear communication with users about upcoming changes and provide migration paths

• Consider using compatibility layers or adapters to bri...read more

Program to find the Nth term in an infinite series

• The series has a repeating pattern

• Use modulo operator to find the index of the repeating pattern

• Calculate the value of Nth term based on the pattern

Program to find the longest palindrome substring in a given string.

• Iterate through the string and check for palindromes of different lengths

• Store the longest palindrome found

• Return the length and substring

I am very comfortable with HTML, CSS and JavaScript.

• I have extensive experience in developing responsive web applications using HTML, CSS and JavaScript.

• I am proficient in using CSS preprocessors like SASS and LESS.

• I have worked with various JavaScript frameworks like React, Angular and Vue.js.

• I am familiar with HTML5 and CSS3 features like Flexbox and Grid layout.

• I am comfortable with debugging and troubleshooting iss

Transitions were driven by desire for growth, new challenges, and better alignment with personal values.

• Desire for professional growth and development

• Seeking new challenges and opportunities

• Alignment with personal values and mission

• Exploring different industries and technologies

• Relocation for personal reasons

Differences between Oracle EBS 12.1 and 12.2 Technical Architecture

• 12.2 has a web-based interface while 12.1 has a client-server interface

• 12.2 has a multi-node architecture while 12.1 has a single-node architecture

• 12.2 has a more modular architecture with fewer dependencies

• 12.2 has a more streamlined upgrade process compared to 12.1

I am currently working as a Senior Software Engineer and I handle my daily tasks by prioritizing them based on their importance and urgency.

• I start my day by checking my emails and responding to any urgent requests

• I then review my to-do list and prioritize my tasks for the day

• I break down complex tasks into smaller, more manageable ones

• I collaborate with my team members to ensure that we are all on the same page

• I use p...read more

The process for registering XML Publisher Report

• Create a data model for the report

• Create a template for the report using RTF or XSL-FO

• Upload the template to the server

• Create a report definition using the data model and template

• Register the report definition with the XML Publisher server

Program to find second max in a list and its time complexity

• Sort the list in descending order and return the second element

• Traverse the list and keep track of the maximum and second maximum elements

• Time complexity: O(n)

The question asks about using .every() and .includes() methods to check if each character of a string is present in another string.

• Loop through each element of the string

• Split the string into an array to access each character

• Use .every() method to check if each character is present in the user string

• Use .includes() method to check if the character is present

DB query to find duplicates in a table, keeping first duplicate in answer.

• Use GROUP BY clause to group the records by the column(s) that may have duplicates

• Use HAVING clause to filter out groups with only one record

• Use MIN or MAX function to select the first record in each group

• Example: SELECT MIN(id), name, COUNT(*) FROM table GROUP BY name HAVING COUNT(*) > 1

Code to map Employee Object from List to Hashmap using Stream API functions.

• Create a List of Employee objects

• Use stream() method to convert List to Stream

• Use collect() method to convert Stream to HashMap

• Use Collectors.toMap() method to create HashMap

• Pass key and value mapping functions to toMap() method