Travelers EDP Software Engineer Interview

Object-Oriented Programming

Programming paradigm that organizes code around objects - bundles data (attributes) and behavior that operates on that data (method)
- Encapsulation, Abstraction, Inheritance, Polymorphism,

Encapsulation

Bundling of data and methods together in a class, restricting access to internal details

Abstraction

Hiding complex implementation details behind a simple interface - user only needs to know what something does not how

Inheritance

Class derives from another class, child class obtains the parent class structure/behavior

Polymorphism

Ability of objects responding in their own way to the same method

MERN Stack

Used to build fast, scalable, full-stack web applications

• Mongo DB: Store and Retrieves application data

• Express.js: Processing incoming HTTP requests and executing server logic

• React: Builds User interface

• Node.js: Processing incoming HTTP requests and executing server logic

What is a REST API?

A REST API is a type of APIthat allows applications to communicate over HTTP requests such as GET, POST, PUT/PATCH, DELETE, often exchanged in JSON format

SQL vs NoSQL Database

SQL database isrelational, used for structured data, for example tables with rows and columns.
- MySQL, Oracle, SQL Server
NoSQL database non-relational, used for unstructured or semi-structured data
- MongoDB, DynamoDB

What is a Load Balancer?

Distributes incoming network traffic across multiple servers so that no single server has to handle entire workload