The backend is the server-side part of an application that users do not see. It holds business logic, data storage, integrations and security, and serves the front end and other systems through APIs.
An API (application programming interface) is a defined contract that lets one piece of software request data or actions from another. It hides internal details behind agreed operations, inputs and responses.
A backend developer builds the server-side systems that store data, apply business rules and serve applications through APIs. Hiring one is how a team secures correctness, security and room to grow in the layer users never see.
A REST API is a web interface that exposes resources at URLs and uses standard HTTP methods to read and change them. GET, POST, PUT and DELETE map to reading, creating, replacing and removing data.
SQL (Structured Query Language) is the standard language for defining, querying and changing data in relational databases. It is used to filter, join, aggregate and update rows stored in tables.
Caching stores copies of frequently used data in a faster location so future requests can be served without repeating slow work. That slow work might be a database query, a computation or a network call.
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