Fusion CX Senior Design Engineer Interview Questions and Answers

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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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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Least recently used rate limiter

Q1. Rate Limiter with possible test cases
Ans. 
Rate limiter is a mechanism to control the rate of requests sent to a server
• Implement a sliding window algorithm to track the number of requests within a specific time frame

• Set a limit on the number of requests allowed per unit of time

• Return an error response when the limit is exceeded

• Test cases: 1. Send requests below the limit - should be successful. 2. Send requests above the limit - should receive an error response
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Q1. Rank teams based on some criteria
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Q1. Job scheduler system design round
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Q1. Basic for Core java
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Q2. Basics of selenium
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Q1. More on framework side
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Q2. Few question on Manual testing
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Q1. Intro about yourself
Ans. 
I am a Senior Engineer with 10+ years of experience in software development, specializing in backend systems and cloud technologies.
• 10+ years of experience in software development

• Specialize in backend systems and cloud technologies

• Strong problem-solving skills

• Experience with large-scale systems

• Proficient in programming languages like Java, Python, and SQL
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Q2. Discussion on Job role
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Q1. ML Related question for backend Engineer
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Pattern programming, javascriptt based questions

Q1. Browser specific questions
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