Amazon Web Services Mechanical Engineer Interview Questions and Answers

Q1. What is n-tier architecture
Ans. 
n-tier architecture is a software design pattern that divides an application into logical layers.
• It separates presentation, application processing, and data management functions.

• Each layer can be developed and maintained independently.

• Examples include 3-tier and 4-tier architectures.

• It improves scalability, maintainability, and flexibility of the application.
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Q1. What is your expectation from company
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Sort the arr, fetch element from array

Q1. Linklist search
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Q2. Sort in link List
Ans. 
Sorting in a linked list involves rearranging the elements in ascending or descending order based on a certain criteria.
• Use a sorting algorithm like bubble sort, selection sort, or merge sort to rearrange the elements in the linked list.

• Traverse the linked list and compare each element with the next one to determine the order in which they should be sorted.

• Update the pointers of the nodes in the linked list to reflect ...read more
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3 dsa questions and various golang concepts and 1 concurrency question

Q1. System design questions
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Q1. What is mutable type
Ans. 
A mutable type is a data type whose values can be changed after they are created.
• Mutable types include lists, dictionaries, and sets in Python.

• Changes to mutable objects affect all references to that object.

• Example: list1 = [1, 2, 3], list1[0] = 4 will change the value of list1 to [4, 2, 3].
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Q2. What is functional interface
Ans. 
A functional interface is an interface that contains only one abstract method.
• Functional interfaces can have multiple default or static methods.

• Examples include Runnable, Callable, and ActionListener interfaces.

• Functional interfaces can be implemented using lambda expressions.
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Q3. Updates in java 17
Ans. 
Java 17 introduces new features like sealed classes, pattern matching for switch statements, and more.
• Sealed classes restrict which classes can be subclasses

• Pattern matching for switch statements simplifies code by combining declaration and assignment

• New APIs like JEP 356: Enhanced Pseudo-Random Number Generators
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