Chirpn IT Solutions Java Full Stack Developer Interview Questions and Answers

It was good and to the point

Q1. Just about the previous job
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Q2. Projects and stuff about the previous job
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Q1. Can you introduce yourself?
Ans. 
Experienced Full Stack Developer with expertise in front-end and back-end technologies.
• Experienced in HTML, CSS, JavaScript for front-end development

• Proficient in Node.js, Express, MongoDB for back-end development

• Familiar with React, Angular for building interactive web applications
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Q2. What is graphQL?, What is REST API? and which is better graphQL or REST API?
Ans. 
GraphQL is a query language for APIs and a runtime for executing those queries. REST API is a set of rules for building web services. Both have their own advantages.
• GraphQL allows clients to request only the data they need, reducing over-fetching and under-fetching.

• REST API follows a more rigid structure and is easier to understand for beginners.

• GraphQL is more efficient for complex queries involving multiple resources...read more
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I was asked to discuss the system design of Google Meet, with a primary focus on video processing and WebRTC.

A graph question regarding LC 1334.

Q1. Can you provide an introduction and a summary of your past experiences, as well as your motivations for wanting to join this company?
Ans. 
Experienced Full Stack Developer with a passion for creating innovative solutions and a strong desire to contribute to a dynamic team.
• Over 5 years of experience in full stack development, working on various projects from concept to deployment.

• Proficient in front-end technologies such as HTML, CSS, JavaScript, and React.

• Skilled in back-end technologies including Node.js, Express, and MongoDB.

• Motivated by the opportunity...read more
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Q1. $lookup in mongodb
Ans. 
The $lookup operator in MongoDB is used to perform a left outer join between two collections.
• Used to combine data from two collections based on a common field

• Requires a local field and a foreign field to match documents

• Returns an array of documents that include matched data from both collections
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Q2. $graphlookup in mongo db
Ans. 
The $graphlookup operator in MongoDB is used to perform recursive queries on graph-like data structures.
• Used to perform recursive queries on graph-like data structures

• Can be used to traverse relationships between documents in a collection

• Helps in querying hierarchical data structures
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Q1. The Database performance is becoming a bottleneck and the team needs to horizontally scale the database. Which design approach should they use to scale the database efficiently?
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Q2. The app needs to send a beyond time notification to user about driver status. The status are asked, arrived, cancelled or completed. Each notification must be processed asynchronously to avoid blocking oth...read more
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