Thales Network Engineer Interview Questions and Answers

Basic leetcode problems

Q1. Basic java questions
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Q1. About project experience
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Normal Aptitude test for 1 hour

Q1. How to reverse an array?
Ans. 
To reverse an array of strings, iterate through the array and swap elements from start to end.
• Iterate through the array using two pointers, one starting from the beginning and the other from the end.

• Swap elements at the two pointers until they meet in the middle.

• Repeat until all elements are swapped and the array is reversed.
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Q1. Tell me about your strengths and weakness
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Q1. Explain OOPS and functional programming
Ans. 
OOPS focuses on objects and classes, while functional programming focuses on functions as first-class citizens.
• OOPS involves concepts like inheritance, encapsulation, and polymorphism.

• Functional programming emphasizes immutability, pure functions, and higher-order functions.

• In OOPS, data is typically stored in objects with methods to manipulate the data.

• Functional programming avoids side effects and mutable state.

• Examp...read more
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Q1. Javascript basics, Easy to Medium coding problems
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Q1. React server side vs client side
Ans. 
React server side rendering generates HTML on the server while client side rendering generates HTML on the browser.
• Server side rendering is better for SEO and initial page load time

• Client side rendering is better for interactivity and dynamic content

• Server side rendering requires more initial setup and configuration

• Client side rendering can be easier to develop and maintain
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Q2. Convert class based component to functional component
Ans. 
To convert a class based component to functional component, we need to remove the class syntax and use hooks instead.
• Remove the class syntax and replace it with a function

• Remove the render method and return the JSX directly

• Replace this.props with props

• Use useState hook to manage state

• Use useEffect hook to manage lifecycle methods
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Q3. SQL easy to medium questions
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Q1. Manager round. Discussion about the current project that you are working, technical implementation using AWS
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Q2. Behavioural questions
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Q1. Behavioural questions
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Q1. Life cycle of Software Development
Ans. 
Software development life cycle is a process used to design, develop, and test software applications.
• 1. Planning: Define project scope, requirements, and timelines.

• 2. Design: Create a detailed design of the software architecture.

• 3. Implementation: Write code based on the design specifications.

• 4. Testing: Verify that the software meets the requirements and is free of bugs.

• 5. Deployment: Release the software to users and...read more
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Round duration - 140 minutes
Round difficulty - Medium

Test timing was at 2:00 pm , it was conducted in a college and the environment was good for the test. Camera was a primary part of test, so no suspicious activity.

Q1. 
Sum of Two Numbers Represented as Arrays
Given two numbers in the form of two arrays where each element of the array represents a digit, calculate the sum of these two numbers and return this sum as an ar...read more
Ans. 
Given two numbers represented as arrays, calculate their sum and return the result as an array.
• Iterate through the arrays from right to left, adding digits and carrying over if necessary

• Handle cases where one array is longer than the other by considering the remaining digits

• Ensure the final sum array does not have any leading zeros
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Round duration - 20 minutes
Round difficulty - Easy

The round was conducted at around 12 p.m. I was called at the college location and then it was conducted. The interviewer was quite polite and frank.

Round duration - 8 minutes
Round difficulty - Easy

This round was conducted right after finishing and clearing the technical round at the same place and on the same day.

Round duration - 180 minutes
Round difficulty - Easy

It was an mcq + coding round. There were aptitude and ouput based question in mcq. And coding questions were easy

Q1. 
Find the Duplicate Number Problem Statement
Given an integer array 'ARR' of size 'N' containing numbers from 0 to (N - 2). Each number appears at least once, and there is one number that appears twice. Yo...read more
Ans. 
Find the duplicate number in an array of integers from 0 to (N-2).
• Iterate through the array and keep track of the frequency of each number using a hashmap.

• Return the number with a frequency greater than 1 as the duplicate number.

• Time complexity can be optimized to O(N) using Floyd's Tortoise and Hare algorithm.
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Q2. 
Reverse String Operations Problem Statement
You are provided with a string S and an array of integers A of size M. Your task is to perform M operations on the string as specified by the indices in array A...read more
Ans. 
Given a string and an array of indices, reverse substrings based on the indices to obtain the final string.
• Iterate through the array of indices and reverse the substrings accordingly

• Ensure the range specified by each index is non-empty

• Return the final string after all operations are completed
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Round duration - 60 Minutes
Round difficulty - Easy

It was technical + hr round. there were 2 people as interviewer. They stated from intro and asked some basic puzzles and hr questions. After that they asked about my projects, technologies and some ds algo and dbms questions.