Leena AI Software Development Engineer Interview Questions and Answers

Aptitude Test with 1 coding question and 8 other aptitude questions

Q1. DSA questions with some dbms questions.
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Q1. DSA + SQL query writing questions. Do revise SQL before interview.
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Q1. What is the DOM ?
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Q2. What is SSR?
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Low level Design Problem in Java

Q1. Data Structures - Graph Problem DFS
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System Design with few details

Q1. They asked to design a database table
Ans. 
Design a database table for managing user accounts in a web application.
• Table Name: Users

• Columns: id (INT, Primary Key), username (VARCHAR), password (VARCHAR), email (VARCHAR), created_at (TIMESTAMP)

• Indexes: Create an index on username for faster lookups.

• Constraints: Ensure email is unique and validate password strength.
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Q1. LLD one question Parking lot system
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Q2. Queue related basic questions
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Q3. Basic .net core questions
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Q1. Promises in javascript
Ans. 
Promises in JavaScript are objects representing the eventual completion or failure of an asynchronous operation.
• Promises are used to handle asynchronous operations in JavaScript.

• They can be in one of three states: pending, fulfilled, or rejected.

• Promises can be chained using .then() to handle success and .catch() to handle errors.
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Q1. Resume based questions
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Q2. Event loop in nodejs
Ans. 
Event loop in Node.js manages asynchronous operations by executing callback functions when certain events occur.
• Event loop is responsible for handling I/O operations, timers, and callbacks in Node.js

• It allows Node.js to perform non-blocking operations efficiently

• Event loop continuously checks the event queue for new events to execute
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Q3. Javascript es6 questions
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