Amazon Senior Data Scientist Interview Questions and Answers

They given 2 program to to 1-2 hour

Q1. Ask basic programming questions
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Round duration - 60 minutes
Round difficulty - Medium

Technical Interview round with questions on C#, Design patterns, OOPS etc.

Q1. What is a base class?
Ans. 
A base class is a class that is used as a starting point for creating other classes. It can be inherited by other classes.
• Base class provides common attributes and methods that can be inherited by other classes

• Derived classes can extend or override the functionality of the base class

• Example: Animal can be a base class with attributes like name and methods like eat, sleep
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Q2. What is a singleton design pattern?
Ans. 
Singleton design pattern ensures a class has only one instance and provides a global point of access to it.
• Used to restrict the instantiation of a class to one object

• Commonly used in logging, caching, thread pools, database connections

• Implemented by creating a static instance of the class and a private constructor to prevent external instantiation
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Q3. What are the different access modifiers in C#?
Ans. 
Access modifiers in C# control the visibility and accessibility of classes, methods, and other members.
• Public - accessible from any other class or assembly

• Private - accessible only within the same class

• Protected - accessible within the same class or derived classes

• Internal - accessible within the same assembly

• Protected Internal - accessible within the same assembly or derived classes
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Q4. What is the default access modifier in C#?
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The default access modifier in C# is 'private'.
• Default access modifier is applied if no access modifier is specified for a class member

• It restricts the access to the member within the same class

• Example: private int myVariable = 10;
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45 min round. Similar to Leetcode medium level question.

45 min coding round, 2 question asked

Q1. System design of proximity service
Ans. 
Design a system for proximity service
• Utilize geolocation data to track user locations

• Implement algorithms to calculate proximity between users

• Use real-time updates to notify users of nearby contacts
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Q1. Behavioral questions
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Q1. Components of service
Ans. 
Components of a service include functionality, reliability, availability, and performance.
• Functionality: The service should perform the intended tasks and meet the requirements.

• Reliability: The service should consistently deliver the expected results.

• Availability: The service should be accessible and operational when needed.

• Performance: The service should perform efficiently and meet performance expectations.
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Q2. Lifecycles of web api
Ans. 
The lifecycle of a web API refers to the stages it goes through from development to retirement.
• The lifecycle typically includes stages like planning, development, testing, deployment, and retirement.

• During planning, the requirements and design of the API are defined.

• Development involves writing the code and implementing the functionality.

• Testing ensures the API works as expected and meets the requirements.

• Deployment in...read more
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Q1. Strenghts/weaknesses
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Q1. When I initially joined my job right after college there was a point where I was constantly
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Q2. It's a great organisation and I've learner a lot here but it's such a small company that it's difficult to find ways to move up ask yourself what makes you feel passionate or happy when you work😊
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Q3. Opportunity great time interest must
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Group discussion can also provide feedback to instructors on participant comprehension.

Implement boolean canConstruct(String targetString, String[] dict) which returns true if we can construct the targetString by concatenating the words given in the dictionary

Q1. Implement key value store
Ans. 
Implement a key value store for storing and retrieving data efficiently.
• Use a hash table or a balanced tree data structure to store key-value pairs.

• Implement functions for inserting, updating, deleting, and retrieving key-value pairs.

• Consider implementing features like transactions, concurrency control, and data persistence.

• Example: Implement a simple key value store using a hash table in Python.
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