A Node.js developer builds server-side applications in JavaScript or TypeScript on the Node.js runtime, such as APIs, real-time services and integrations. For a team, hiring one often means a single language across frontend and backend.
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.
Microservices is an architectural style in which an application is built as a set of small, independently deployable services. Each owns a specific business capability and its own data, and talks to the others over the network.
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.
WebSockets is a protocol that keeps a single, long-lived, two-way connection open between a client and server. Either side can send messages at any time, which suits real-time features.
A Java developer builds software in Java, a mature, strongly typed language used for enterprise backends, financial systems and large web services. Organisations usually hire one to extend or modernise core systems that run on the JVM.
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