Thales Client Service 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. Find the second highest salary in sql
Ans. 
Use SQL query with ORDER BY and LIMIT to find the second highest salary.
• Use SELECT statement to retrieve salary column from the table.

• Use ORDER BY clause to sort the salaries in descending order.

• Use LIMIT 1,1 to get the second highest salary.
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Q2. Check duplicate rows using sql, group by, window function.
Ans. 
Use SQL query with GROUP BY and window function to check for duplicate rows.
• Use GROUP BY to group rows with same values together

• Use COUNT() function to count the number of occurrences of each group

• Use window function like ROW_NUMBER() to assign a unique number to each row within a group
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Q1. Node js working in detail
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Node.js is a runtime environment that allows you to run JavaScript on the server side.
• Node.js is built on Chrome's V8 JavaScript engine.

• It uses an event-driven, non-blocking I/O model that makes it lightweight and efficient.

• Node.js is commonly used for building server-side applications, APIs, and real-time applications.

• It has a large ecosystem of libraries and frameworks, such as Express.js and Socket.io.
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Q2. Timer working in node
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In Node.js, timers can be implemented using functions like setTimeout() and setInterval().
• Use setTimeout() to execute a function once after a specified delay

• Use setInterval() to execute a function repeatedly at a specified interval

• Clear a timer using clearTimeout() or clearInterval()

• Example: setTimeout(() => { console.log('Timer executed!'); }, 2000);
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Q1. HLD questions on db and backend
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Q2. Relational non relational db
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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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