Amazon Interview Questions, Process, and Tips

Q1. Least Common Ancestor of binary tree
Ans. 
The least common ancestor of a binary tree is the node that is the lowest common ancestor of two given nodes in the tree.
• Start from the root node and recursively search for the given nodes in the left and right subtrees.

• If one node is found in the left subtree and the other in the right subtree, then the current node is the least common ancestor.

• If both nodes are found in the left subtree, then the least common ancesto...read more
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Q2. Smallest path to reach from a to b point in matrix
Ans. 
Use Dijkstra's algorithm to find the smallest path from point a to point b in a matrix.
• Implement Dijkstra's algorithm to find the shortest path in a matrix

• Create a matrix representation of the graph with weights on edges

• Start from point a and explore all possible paths to reach point b
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Q1. Write a query to get first order for every customer in the year 2021
Ans. 
Query to retrieve the first order for each customer in 2021
• Use a subquery to find the minimum order date for each customer in 2021

• Join the subquery with the main table on customer ID and order date to get the first order
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Q2. How do you connect S3 and Lambda
Ans. 
S3 and Lambda can be connected using S3 event notifications to trigger Lambda functions.
• Set up an S3 bucket and create a Lambda function

• Configure the S3 bucket to send event notifications to the Lambda function

• Define the event type and prefix/suffix for triggering the Lambda function

• Lambda function will be automatically triggered when the specified event occurs in the S3 bucket
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Q3. What is Churn Rate? What is customer conversion rate?
Ans. 
Churn rate is the percentage of customers who stop using a product or service over a certain period of time. Customer conversion rate is the percentage of potential customers who take a desired action, such as making a purchase.
• Churn rate measures customer retention and loyalty.

• Customer conversion rate measures the effectiveness of marketing and sales efforts.

• Churn rate can be calculated by dividing the number of custo...read more
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Aptitude test is a standardized assessment that measures a person's skills and abilities, rather than their existing knowledge or qualification.

Q1. Why do you want to join Amazon
Ans. 
I want to join Amazon because of its innovative culture, global impact, and opportunities for growth.
• Innovative culture: Amazon is known for its cutting-edge technology and constant innovation.

• Global impact: Working at Amazon allows me to be part of a company that has a worldwide reach and influence.

• Opportunities for growth: Amazon offers a wide range of career development opportunities and the chance to learn and grow
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Q2. What does algorithm mean
Ans. 
An algorithm is a set of instructions or rules designed to solve a specific problem or perform a specific task.
• An algorithm is a step-by-step procedure for solving a problem or accomplishing a task.

• It is a finite sequence of well-defined, computer-implementable instructions.

• Algorithms can be used in various fields such as computer science, mathematics, and engineering.

• Examples of algorithms include sorting algorithms l...read more
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Q3. What is data structure
Ans. 
Data structure is a way of organizing and storing data in a computer so that it can be accessed and modified efficiently.
• Data structures define the way data is organized and stored in memory.

• Examples include arrays, linked lists, stacks, queues, trees, and graphs.

• Choosing the right data structure is important for optimizing performance and memory usage in software development.
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Q4. What is collections API
Ans. 
Collections API is a set of tools and protocols that allow developers to interact with and manage collections of data.
• Collections API provides methods for adding, removing, and updating items in a collection.

• It allows developers to retrieve specific items from a collection based on various criteria.

• Collections API can also include features for sorting and filtering data within a collection.

• Examples of Collections API i...read more
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Aptitude, grammar and logical reasoning

Group discussion for around 15 members in one set

Q1. Why did you choose Amazon
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Q2. Why did choose this particular role
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