PayPal Customer Solution Specialist Interview Questions and Answers

SOLID is a set of five design principles 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: Objects 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...read more

CQRS pattern separates read and write operations in an application

• CQRS stands for Command Query Responsibility Segregation

• It separates the read and write operations into two different models

• Commands are used for write operations, while queries are used for read operations

• Helps in scaling and improving performance by optimizing each model separately

Patterns for microservice communication involve synchronous and asynchronous methods to ensure reliable and efficient communication.

• Use synchronous communication for simple interactions between services, such as REST APIs.

• Implement asynchronous communication for more complex interactions, like message queues or event-driven architecture.

• Consider using a combination of both synchronous and asynchronous communication dep...read more