G4S Software Engineer Interview Questions and Answers

Q1. What are the responsibilities of a Data Analyst?
Ans. 
Data Analysts are responsible for collecting, processing, and analyzing data to help organizations make informed decisions.
• Collecting and organizing data from various sources

• Cleaning and processing data to ensure accuracy and consistency

• Analyzing data using statistical techniques and tools

• Creating visualizations and reports to present findings

• Interpreting data to provide insights and recommendations

• Collaborating with s...read more
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Q2. Software engineer
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Round duration - 126 minutes
Round difficulty - Hard

This round consist of coding questions as well as mcqs based on aptitude as well as some domain sections. This round is hard.

Q1. 
Maximum Path Sum in a Matrix
Given an N*M matrix filled with integer numbers, determine the maximum sum that can be obtained from a path starting from any cell in the first row to any cell in the last row...read more
Ans. 
Find the maximum sum path in a matrix from top row to bottom row by moving down or diagonally.
• Use dynamic programming to keep track of maximum sum at each cell.

• At each cell, consider the maximum sum from the cell above, left diagonal, and right diagonal.

• Add the current cell value to the maximum of the three possibilities.

• Repeat this process for all cells in the matrix to find the maximum sum path.
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Q2. 
Boolean Matrix Transformation Challenge
Given a 2-dimensional boolean matrix mat of size N x M, your task is to modify the matrix such that if any element is 1, set its entire row and column to 1. Specifi...read more
Ans. 
Modify a boolean matrix such that if any element is 1, set its entire row and column to 1.
• Iterate through the matrix to find elements with value 1

• Store the row and column indices of these elements

• Update the entire row and column for each element found to be 1
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Round duration - 45 minutes
Round difficulty - Easy

In this round the interviewer ask few questions related to domain and at last he ask some behavioral questions.

Q1. 
Intersection of Linked List Problem
You are provided with two singly linked lists containing integers, where both lists converge at some node belonging to a third linked list.
Your task is to determine t...read more
Ans. 
Find the node where two linked lists merge, return -1 if no merging occurs.
• Traverse both lists to find the lengths and the last nodes

• Align the starting points of the lists by adjusting the pointers

• Traverse both lists simultaneously until a common node is found
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Standard DSA problems

Q1. Java questions, DBs
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Q1. Culture fit for startup
Ans. 
Culture fit for a startup is crucial for success.
• Startup culture is often fast-paced and dynamic.

• Employees need to be adaptable and willing to take on multiple roles.

• Collaboration and teamwork are highly valued.

• Innovation and creativity are encouraged.

• Open communication and transparency are important.

• A strong work ethic and dedication are necessary.

• Risk-taking and learning from failures are embraced.

• Passion and drive f
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Q1. Leadership qualities in the current role
Ans. 
Demonstrated leadership qualities in current role
• Led a team of 5 developers to successfully complete a project ahead of schedule

• Took initiative to organize weekly team meetings to discuss progress and address any challenges

• Mentored junior team members, providing guidance and support to help them improve their skills

• Collaborated with cross-functional teams to ensure smooth coordination and effective communication

• Took ow...read more
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Q1. Find the middle element whose left and right sum is equal
Ans. 
Iterate through array to find middle element with equal left and right sum
• Iterate through array and calculate sum of elements on left and right of each element

• Return element if left sum equals right sum

• Handle edge cases like array with less than 3 elements
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Q1. Basic oops concept
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Q1. Print the largest string from the given 5 strings
Ans. 
Find the largest string from a given array of 5 strings
• Iterate through the array of strings and compare the length of each string

• Keep track of the largest string found so far

• Return the largest string at the end
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Q2. Check if the required dropdown option is displayed or not
Ans. 
Use Selenium WebDriver to locate the dropdown element and check if the required option is displayed
• Locate the dropdown element using Selenium WebDriver

• Use the Select class to interact with the dropdown

• Verify if the required option is displayed using isSelected() method
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Basic coding questions that are available with just one google search