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 load balancer is a network component that spreads incoming requests across several servers or containers. It keeps any single instance from being overloaded and steers traffic away from unhealthy ones.
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.
Stream processing is computing on data continuously as each event arrives, so results update within seconds. It is the engine behind real-time data streaming, replacing waits for scheduled batch runs.
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.
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