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10+ Pfizer Interview Questions and Answers
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
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.
Q2. When a number is represented in LinkedList, how do we add 2 numbers
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 remainder in the result list.
Move to the next nodes in both lists....read more
Q3. Explain what happens when we click on a URL
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.
Q4. Defining the high-level component structure of a page.
High-level component structure of a page refers to the organization of the main elements on a webpage.
Identify the main content area of the page
Determine the navigation menu and its placement
Decide on the placement of secondary content such as ads or related articles
Consider the footer and its contents
Ensure the page is responsive and adaptable to different screen sizes
Q5. Implement tail -f command w/o use of external libraries
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
Q6. Difference between async, concurrency and parallelism
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 cores for faster processing.
Example: Async programming in Java...read more
Q7. Explain projects in high level
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.
Q8. How google.com works
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 experience.
Q9. Chat app using sockets
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, chat room creation, and message history.
Consider scalabil...read more
Q10. Scale up existing project
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
Q11. code the tail -f logger
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
Q12. Journey of request
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
Interview Process at Pfizer
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