HackerRank Backend Software Engineer Interview Questions and Answers

Equation, ratio and proportion

1 hr test on HackerEarth platform, DSA questions

Q1. Explain basics of c#
Ans. 
C# is a programming language developed by Microsoft for building a wide range of applications on the .NET framework.
• C# is an object-oriented language with features like classes, inheritance, and polymorphism.

• It is strongly typed, meaning variables must be declared with a specific data type.

• C# supports modern programming concepts like async/await for asynchronous programming.

• It is commonly used for developing desktop, w...read more
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Q2. C# basics oops sql server
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Q1. Basic react questions
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Basic DSA Questions of array

Stream a live log file to browser

Q1. Existing project details
Ans. 
The existing project is a web application for managing inventory and sales.
• Built using React for the front-end and Node.js for the back-end

• Uses MongoDB as the database

• Includes features such as user authentication, product management, and sales tracking
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Q1. Scale up existing project
Ans. 
Scaling up an existing project involves optimizing performance, increasing capacity, and improving efficiency.
• Identify bottlenecks and areas for improvement

• Implement caching mechanisms to reduce load times

• Optimize database queries for faster retrieval

• Upgrade hardware or infrastructure to handle increased traffic

• Use load balancing to distribute traffic evenly across servers
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Q1. General question about the project, challenges, etc
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Q1. Implement tail -f command w/o use of external libraries
Ans. 
Implementing tail -f command without external libraries in Python
• Open the file in read mode

• Use a loop to continuously read new lines added to the file

• Print the new lines as they are read
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Q1. General questions on challenges, current role, production issues
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Q2. DSA Question - next warm day
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Q1. How google.com works
Ans. 
Google.com is a search engine that uses web crawlers to index websites and algorithms to rank search results.
• Google uses web crawlers to index websites and store information in its database.

• Algorithms are used to rank search results based on relevance and popularity.

• Google also uses personalized search results based on user data and location.

• Google's homepage is simple and fast-loading to provide a user-friendly experi
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Q2. How rest works, in array of 500 elements give top 15 elements discussion about complexities
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Q1. Implement tail f
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