ALTRAN SOLUTIONS INDIA Software Engineer Interview Questions and Answers

The coding questions were at Leetcode difficulty level and were derived from the Striver sheet.

Q1. BFS graph level
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Q2. Minimum flight distance . I was not shortlisted for interview.
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I was on data structures on python , c++, sql and java

Q1. Sql based questions
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Q2. Java based DS and devops
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Q3. C++ data structures
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Q4. Machine learning and Data structures
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Case study of real life

Fibonacci series and program to find the max number in list

Q1. What is oops and explain each of the terms
Ans. 
OOPs stands for Object-Oriented Programming. It is a programming paradigm based on the concept of objects.
• OOPs consists of four main principles: Inheritance, Encapsulation, Abstraction, and Polymorphism.

• Inheritance allows a class to inherit properties and behavior from another class.

• Encapsulation refers to the bundling of data and methods that operate on the data into a single unit.

• Abstraction focuses on hiding the int...read more
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Q2. What is list, dictionary, set and tuple and difference between them
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List, dictionary, set, and tuple are data structures in Python with different characteristics and use cases.
• List: ordered collection of items, mutable (can be changed), represented by square brackets []

• Dictionary: unordered collection of key-value pairs, mutable, represented by curly braces {}

• Set: unordered collection of unique items, mutable, represented by curly braces {}

• Tuple: ordered collection of items, immutable ...read more
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It was a machine coding round

Q1. Similar to the other question
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Q2. Give an array and an element sort the array with difference of that number to array elements
Ans. 
Sort an array of strings by the difference of a given element to each array element.
• Iterate through the array and calculate the absolute difference between the given element and each array element.

• Sort the array based on the calculated differences.

• Return the sorted array.
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Q1. JavaScript prototype sorting function
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JavaScript prototype sorting function for arrays of strings
• Use the Array.prototype.sort() method to sort an array of strings

• Pass a compare function to specify the sorting order

• Example: ['banana', 'apple', 'cherry'].sort((a, b) => a.localeCompare(b))
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Q2. Promise polyfill from scratch
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Creating a Promise polyfill from scratch involves implementing the Promise API using callbacks and handling asynchronous operations.
• Understand the Promise API and its methods (resolve, reject, then, catch)

• Implement a constructor function that takes an executor function as an argument

• Handle asynchronous operations using callbacks and setTimeout

• Implement the then and catch methods to handle success and error cases respec
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Q3. React hooks -useEffect useMemo
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Q1. Session Management in applications
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Session management is the process of securely managing user sessions in web applications.
• Use cookies or tokens to track user sessions

• Implement session timeout to prevent unauthorized access

• Store session data securely on the server side

• Use HTTPS to encrypt session data during transmission
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Q2. Why react is fast than other frameworks
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React is faster than other frameworks due to its virtual DOM, efficient diffing algorithm, and use of server-side rendering.
• React uses a virtual DOM which allows it to update only the necessary components instead of re-rendering the entire page.

• React's efficient diffing algorithm compares the virtual DOM with the actual DOM to minimize updates and improve performance.

• React supports server-side rendering, which can impr...read more
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