Uplers Lead Developer Interview Questions and Answers

It was a medium-level DSA round

This was also a DSA round

This again a DSA round

Q1. Can't disclose the question because of NDA signed but it was a design round
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Q1. This was a project discussion round
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Q1. Why you want to join facebook?
Ans. 
I want to join Facebook because of its innovative technology, global impact, and opportunities for growth.
• Innovative technology: Facebook is known for its cutting-edge technology and constant innovation.

• Global impact: Working at Facebook would allow me to contribute to a platform that connects billions of people worldwide.

• Opportunities for growth: Facebook offers a dynamic and fast-paced work environment with ample opp...read more
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Q2. Whats the best feature you like in Facebook?
Ans. 
I appreciate the personalized news feed feature on Facebook.
• Personalized news feed shows content based on user interests

• Helps users stay updated on relevant information

• Allows users to engage with content they are interested in
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I was asked a question based on strings that required BFS to solve.

Q1. Given a binary tree, do right rotation on each node.
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DSA Problem statement of Trie

Q1. 1. What is request pipeline? What is the order of the classes in Request pipeline. 3. Access Specifiers in C#.
Ans. 
Request pipeline is the sequence of classes and modules that process an incoming HTTP request in ASP.NET.
• Request pipeline in ASP.NET is responsible for handling incoming HTTP requests and generating responses.

• The order of classes in the request pipeline includes modules like URL routing, authentication, authorization, and finally the handler that generates the response.

• Access specifiers in C# are keywords used to speci...read more
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Q2. What is Filter ? What is the order of filter classes ?
Ans. 
Filter is a feature in ASP.NET that allows you to execute logic before or after an action method is called.
• Filters are used to perform logic before or after an action method is called in ASP.NET MVC.

• There are five types of filter classes in ASP.NET: Authorization filters, Action filters, Result filters, Exception filters, and Resource filters.

• The order of filter classes is: Authorization filters, Action filters, Result...read more
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Q3. What is the difference between
Ans. 
The difference between == and Equals() in C# is that == is used for comparing reference equality, while Equals() is used for comparing value equality.
• == is used to compare reference equality, meaning it checks if two objects reference the same memory location.

• Equals() is used to compare value equality, meaning it checks if the values of two objects are the same.

• Example: string str1 = "hello"; string str2 = "hello"; boo...read more
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Q1. Past Experience
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It was having english and maths questions

Code was easy kindly do pratice

Q1. Write a piece of code for Rest API
Ans. 
Code snippet for Rest API
• Use a framework like Express.js for Node.js or Flask for Python to create the API

• Define routes for different endpoints such as GET, POST, PUT, DELETE

• Use middleware for authentication and validation

• Return data in JSON format
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