Codebase Senior Software Engineer Interview Questions and Answers

Pub sub is a messaging pattern where senders of messages, called publishers, do not program the messages to be sent directly to specific receivers, called subscribers.

• Publishers send messages to a topic or channel without knowing which subscribers will receive them.

• Subscribers express interest in one or more topics and receive messages only when they are published to those topics.

• Pub sub is commonly used in distributed...read more

Decorators are functions that modify the behavior of other functions or classes without changing their source code.

• Decorators are used to add functionality to existing code without modifying it.

• They are defined using the '@' symbol followed by the decorator function name.

• They can be used to add logging, caching, authentication, and other features to functions or classes.

• Examples include the @staticmethod and @classmeth...read more

Multithreading is the ability of a program to perform multiple tasks concurrently.

• Multithreading allows a program to utilize multiple CPUs or cores.

• It can improve performance and responsiveness of a program.

• Threads share the same memory space and can communicate with each other.

• Examples include web servers handling multiple requests simultaneously and video games rendering graphics while processing user input.

asyncio is a Python library for writing concurrent code using the async/await syntax.

• asyncio allows for non-blocking I/O operations

• It provides a way to write asynchronous code in a synchronous style

• asyncio is built on top of the event loop, which schedules and executes coroutines

• Examples of asyncio-based libraries include aiohttp and aioredis

Decorators are functions that modify the behavior of other functions or classes without changing their source code.

• Decorators are used to add functionality to existing code without modifying it.

• They are defined using the @ symbol followed by the decorator function name.

• Decorators can be used to add logging, caching, authentication, and other features to functions and classes.

• Examples of decorators in Python include @st...read more

Design patterns are reusable solutions to commonly occurring problems in software design.

• Design patterns provide a standard terminology and a common platform for communication among developers.

• They help in making code more flexible, reusable, and maintainable.

• Examples of design patterns include Singleton, Factory, Observer, and Decorator patterns.

Pub sub is short for publish-subscribe. It is a messaging pattern where senders of messages, called publishers, do not program the messages to be sent directly to specific receivers, called subscribers.

• Publishers send messages to a topic or channel without knowing who the subscribers are.

• Subscribers receive messages from the topic or channel they have subscribed to.

• Pub sub is commonly used in distributed systems and ev...read more

Asynchronous programming is a programming paradigm that allows multiple tasks to run concurrently without blocking the main thread.

• Asynchronous programming is achieved through the use of callbacks, promises, and async/await functions.

• It is commonly used in web development for handling user input and making API calls.

• Asynchronous programming can improve the performance and responsiveness of an application.

• Examples of as...read more