Essjay Ericsson Senior Support Engineer Interview Questions and Answers

Q1. How would you write a REST API from scratch? Explain your role in the project.
Ans. 
To write a REST API from scratch, I would follow these steps:
• Define the resources and endpoints

• Choose a programming language and framework

• Implement CRUD operations for each resource

• Use HTTP methods and status codes correctly

• Add authentication and authorization

• Test the API using tools like Postman

• Document the API using tools like Swagger
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Basic ds algo round with questions asked around arrays strings

Q1. Minimum in Rotated Sorted array
Ans. 
Find the minimum element in a rotated sorted array.
• Perform binary search to find the pivot point where the array is rotated.

• Compare the element at pivot point to the first element to determine which half to search for the minimum.

• Continue binary search in the appropriate half to find the minimum element.
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Q2. API and DB Schema for Instagram based application.
Ans. 
API for Instagram application to interact with user data and DB schema to store user information and posts.
• API endpoints for user authentication, posting photos, liking photos, following users, etc.

• DB schema with tables for users, posts, comments, likes, followers, etc.

• Example API endpoint: /users/{userId}/posts to retrieve all posts by a specific user.

• Example DB schema: Users table with columns for username, email, pr
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Q1. Resume introspection, AWS, K8s
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Q1. Third party took the interview. Basics of programming and database were asked.
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Q1. Asked to build a small game. LLD round.
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Q1. What is a dirty read in a database?
Ans. 
A dirty read occurs when a transaction reads data that has been modified but not yet committed by another transaction.
• Dirty reads can lead to inconsistencies, as the data may change before the first transaction is committed.

• For example, if Transaction A updates a record but hasn't committed yet, and Transaction B reads that record, Transaction B sees uncommitted data.

• If Transaction A rolls back, Transaction B will have...read more
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Q2. What are design patterns?
Ans. 
Design patterns are reusable solutions to common software design problems, promoting best practices and improving code maintainability.
• Creational patterns (e.g., Singleton, Factory Method) manage object creation.

• Structural patterns (e.g., Adapter, Composite) deal with object composition.

• Behavioral patterns (e.g., Observer, Strategy) focus on communication between objects.

• Design patterns help in code reusability and sca
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