NextComm Corporation AWS Engineer Interview Questions and Answers

Basic questions only.

Q1. Basic questions like, how react works?
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Q2. What is the equivalent of ReactDOM in mobile application development?
Ans. 
The equivalent of ReactDOM in mobile application development is React Native.
• React Native is a framework for building mobile applications using React.

• It allows developers to write code in JavaScript and render native components.

• Just like ReactDOM in web development, React Native handles rendering components to the screen.
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Q1. Concurrent HashMap versus HashMap?
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Concurrent HashMap is thread-safe and allows concurrent access, while HashMap is not thread-safe.
• Concurrent HashMap is suitable for multi-threaded environments where multiple threads can access and modify the map concurrently.

• HashMap is not thread-safe and can lead to data corruption if accessed concurrently by multiple threads.

• Concurrent HashMap uses internal locking mechanisms to ensure thread safety, while HashMap d...read more
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Q2. Partitioning a large Database.
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Partitioning a large database involves dividing the data into smaller chunks to improve performance and manageability.
• Identify key columns for partitioning, such as date ranges or customer IDs.

• Choose a partitioning strategy, such as range partitioning or hash partitioning.

• Implement partitioning using database features like table partitioning in Oracle or partitioned tables in PostgreSQL.
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Q1. Project explanation
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Q2. C syntaxes, questions on arrays pointers
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Q1. Coding related to pointers
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Q2. Recursion program
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Basic math questions

Q1. Questions about oops concept
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Q2. What is function overloading and function overriding
Ans. 
Function overloading is having multiple functions with the same name but different parameters. Function overriding is redefining a base class function in a derived class.
• Function overloading allows multiple functions with the same name but different parameters.

• Function overriding involves redefining a base class function in a derived class with the same name and parameters.

• Example of function overloading: void print(in...read more
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Q1. Explian oops concepts
Ans. 
Object-oriented programming concepts that focus on classes and objects for better code organization and reusability.
• Encapsulation: Bundling data and methods that operate on the data into a single unit (class).

• Inheritance: Ability of a class to inherit properties and behavior from another class.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the complex implementation det...read more
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Q2. Types of waits in selenium
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Types of waits in Selenium include implicit, explicit, and fluent waits.
• Implicit wait: Waits for a certain amount of time before throwing a NoSuchElementException.

• Explicit wait: Waits for a certain condition to occur before proceeding further in the code.

• Fluent wait: Waits for a condition to be true with a specified frequency of checking.

• Example: driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
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Q1. Salary dsicussion
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Q2. Previous company details
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Q1. Project explaining
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Q2. Write code to generate csv file with note pad data
Ans. 
Code to generate a CSV file with notepad data
• Open a text file and read the data

• Parse the data and write it to a CSV file

• Use libraries like pandas in Python for easier CSV handling
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