Fleetx.io Senior QA Engineer Interview Questions and Answers

Q1. 2 rounds, 2 coding questions in each round. Managerial round.
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2 Leetcode Medium questions on hackerrank

Q1. Kadane algorithm based question
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Q2. Leetcode medium
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Q3. Resume based questions
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Q1. Probability question math problem
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Q2. Puzzle to solve
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Q3. AI based question
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Q4. 1 question to solve Leetcode medium
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2 Leetcode medium - LRU Cache and sliding window question

Q1. Design Whatsapp
Ans. 
Design a messaging app like Whatsapp
• Implement end-to-end encryption for secure messaging

• Allow users to send text messages, images, videos, and documents

• Include features like group chats, voice and video calls, status updates

• Provide option for users to share their location

• Develop a user-friendly interface with customizable settings
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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. Design a data structure that can take a number with infinite digits and support operation like addition
Ans. Create a linked list of number where each node is a digit of a number
Answered by inspiringstarfruit
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Q2. Explain in-depth of the projects you did
Ans. Explain project in details with all complexities
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Q1. Design a system that reads content of a file and show it in a webpage as the file gets update the webpage should also get updated in realtime
Ans. 
Design a system to display real-time updates of a file's content on a webpage.
• Use a server-side programming language like Node.js to read the file content.

• Implement a WebSocket connection between the server and the webpage for real-time updates.

• Whenever the file is updated, send the updated content to the webpage using the WebSocket connection.

• Update the webpage dynamically using JavaScript to display the new content.
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Q1. Engineering Manager round - Explain the projects you did in detail
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Q1. Director round - Explain the projects in details
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Q1. Explain projects in high level
Ans. 
I have worked on various projects involving software development and implementation.
• Developed a web application for a retail company to manage inventory and sales.

• Implemented a mobile app for a healthcare organization to track patient data and appointments.

• Created a data analysis tool for a financial institution to analyze market trends and make investment decisions.
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Q2. Explain your strong points
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Q3. Explain your entire background
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Q1. Explain what happens when we click on a URL
Ans. 
When we click on a URL, the browser sends a request to the server, which responds with the requested webpage.
• Clicking on a URL triggers the browser to send an HTTP request to the server.

• The server receives the request and processes it.

• The server then sends back a response containing the requested webpage.

• The browser receives the response and renders the webpage for the user to view.
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Q2. When a number is represented in LinkedList, how do we add 2 numbers
Ans. 
To add two numbers represented as linked lists, iterate through both lists simultaneously, adding corresponding digits and carrying over the carry value.
• Create a new linked list to store the result.

• Initialize a carry variable to 0.

• Iterate through both linked lists simultaneously, adding the corresponding digits and the carry value.

• If the sum of the digits is greater than 9, update the carry value and store the remainde...read more
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Q1. Machine coding round
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Q2. Chat app using sockets
Ans. 
A chat app using sockets allows real-time communication between users.
• Use a socket library or framework to handle the communication.

• Implement a server that listens for incoming connections and manages the chat rooms.

• Establish a socket connection between the server and clients for sending and receiving messages.

• Handle message encryption and decryption for secure communication.

• Implement features like user authentication,...read more
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Q1. Project Discussions
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Q1. Why am i leaving my old org etc
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Code the LRU cache on hacker rank

Q1. Code the tail -f logger
Ans. 
Implement a tail -f logger in code
• Use a file pointer to open the log file

• Read the file line by line and print new lines as they are added

• Use a loop to continuously check for new lines in the file
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