Senior Platform Associate L2 Interview Questions and Answers

I have used the Singleton design pattern in my previous projects.

• Singleton pattern ensures a class has only one instance and provides a global point of access to it.

• It is useful when you want to control the number of instances that can be created.

• Example: Creating a Logger class that should have only one instance throughout the application.

SOLID principles are a set of five design principles in object-oriented programming to make software designs more understandable, flexible, and maintainable.

• S - Single Responsibility Principle: A class should have only one reason to change.

• O - Open/Closed Principle: Software entities should be open for extension but closed for modification.

• L - Liskov Substitution Principle: Objects of a superclass should be replaceable with objects of its subclasses without affecting the func...read more

Concurrent API allows multiple tasks to be executed simultaneously, improving efficiency and performance.

• Concurrent API enables parallel processing of multiple requests at the same time.

• It helps in reducing latency and improving overall system performance.

• Examples include Java's CompletableFuture class for asynchronous programming and Node.js's cluster module for parallel processing.

A Dockerfile is a script that contains instructions to build a Docker image.

• Start with a base image using 'FROM', e.g., 'FROM ubuntu:20.04'.

• Set environment variables with 'ENV', e.g., 'ENV APP_HOME /app'.

• Copy files into the image using 'COPY', e.g., 'COPY . $APP_HOME'.

• Install dependencies using 'RUN', e.g., 'RUN apt-get update && apt-get install -y python3'.

• Specify the command to run the application with 'CMD', e.g., 'CMD ["python3", "app.py"]'.