HiLabs Senior Data Engineer Interview Questions and Answers

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
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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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A working software coding problem. Build client-server. Make sure your IDE is ready

Q1. Difference between async, concurrency and parallelism
Ans. 
Async is non-blocking, concurrency is managing multiple tasks at the same time, parallelism is executing multiple tasks simultaneously.
• Async allows non-blocking execution of code, enabling other tasks to run while waiting for I/O operations.

• Concurrency involves managing multiple tasks at the same time, but not necessarily simultaneously.

• Parallelism is executing multiple tasks simultaneously, utilizing multiple CPU core...read more
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Q2. Journey of request
Ans. 
The journey of a request refers to the process of a request being made, processed, and fulfilled by a system.
• Request initiation by a user or system

• Routing of the request to the appropriate service or endpoint

• Processing of the request by the service

• Response generation and delivery back to the user
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Q1. What are your strengths
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Q2. What irritates you
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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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