20+ Staff Software Engineer Interview Questions and Answers

Use memory-mapped files or stream the file in chunks.

• Use memory-mapped files to access the file in chunks.

• Stream the file in chunks using a buffer.

• Use compression techniques to reduce the file size before opening.

Given an array, return a new array where each element is the product of all elements in the original array except the corresponding element.

• Create a new array of the same length as the input array

• Iterate through the input array and calculate the product of all elements except the current element

• Store the product in the corresponding position in the new array

• Return the new array

The current project follows a microservices architecture.

• The project is divided into multiple small services that communicate with each other.

• Each service is responsible for a specific task or functionality.

• Communication between services is done through APIs or message queues.

• The architecture allows for scalability and flexibility.

• Examples of microservices used in the project include user management, payment processing, and inventory management.

Move all zeros to end of array & design Google Photos life application

• Iterate through the array and move all zeros to the end

• Design a user-friendly interface for Google Photos life application

• Implement features like automatic photo backup, organization, and sharing

• Utilize machine learning for image recognition and categorization

Program to check if a given number is prime or not.

• A prime number is only divisible by 1 and itself.

• Loop through numbers from 2 to n/2 and check if n is divisible by any of them.

• If n is divisible by any number, it is not prime.

• If n is not divisible by any number, it is prime.

Docker is a containerization platform that allows developers to package, deploy, and run applications in isolated environments.

• Docker uses containerization technology to create isolated environments for applications to run in.

• It allows developers to package an application and all its dependencies into a single container.

• Containers can be easily deployed and run on any system that supports Docker.

• Docker provides a way to manage and scale applications more efficiently.

• Examples ...read more

Design a key value store with get, put, ttl, expire

• Use a hash table to store key-value pairs

• Implement put() to add a new key-value pair

• Implement get() to retrieve the value for a given key

• Implement ttl() to set a time-to-live for a key

• Implement expire() to delete a key-value pair after its time-to-live has expired

A notification system design for software engineering.

• Identify the types of notifications needed

• Determine the target audience for each notification

• Choose the appropriate delivery method (email, push notification, etc.)

• Design a user-friendly interface for managing notifications

• Implement a system for tracking and analyzing notification engagement

• Ensure the system is scalable and can handle high volumes of notifications

C++ commonly uses design patterns like Singleton, Factory, Observer, and Strategy to solve recurring design problems.

• Singleton: Ensures a class has only one instance (e.g., a configuration manager).

• Factory: Creates objects without specifying the exact class (e.g., shape creation in a graphics application).

• Observer: Allows objects to subscribe and receive updates (e.g., event handling in GUI applications).

• Strategy: Enables selecting an algorithm at runtime (e.g., sorting algor...read more

Polyfill for .reduce & Promise

• For .reduce polyfill, create a function that takes an array, a callback function, and an initial value as arguments

• Inside the function, loop through the array and apply the callback function to each element, updating the accumulator

• For Promise polyfill, create a function that takes a callback function with resolve and reject parameters

• Inside the function, call the callback function with resolve and reject as arguments based on the asynchronous op...read more

Design a side bar with lot of elements

• Consider using a collapsible menu for better organization

• Use icons or symbols for each element to save space

• Implement a search bar for easy navigation

• Include categories or sections to group similar elements together

Design a secure and efficient payment system for credit cards

• Implement tokenization to securely store credit card information

• Use encryption to protect sensitive data during transactions

• Integrate with payment gateways like Stripe or PayPal for processing payments

• Implement fraud detection algorithms to prevent unauthorized transactions

Passwordless SSH allows for secure and convenient access between machines.

• Generate SSH key pair on local machine using ssh-keygen command

• Copy public key to remote machine's authorized_keys file

• Ensure correct permissions on .ssh directory and authorized_keys file

• Test SSH connection without password prompt

Phone book application to store and manage contacts

• Allow users to add, edit, delete contacts

• Implement search functionality to find contacts quickly

• Include features like call, message, email directly from the app

Eventbrite is a platform for creating, promoting, and managing events.

• Allow users to create events with details like date, time, location, and ticket types

• Provide tools for promoting events through social media and email marketing

• Include features for managing RSVPs, ticket sales, and attendee check-ins