Most SaaS APIs are multi-tenant: the same infrastructure serves many customers, each operating in isolation from the others. A user of Tenant A should never see, modify, or even know about the data of Tenant B. This isolation is the foundational guarantee of a multi-tenant system, and it must hold at every layer of the stack — not just at the query level, but at the API design level, the authentication level, and the operational level.

Documentation is the first thing a developer encounters and the last thing most teams prioritize. The result is a familiar pattern: the API is built, the launch deadline approaches, documentation gets written in a hurry by someone who did not build the API and does not fully understand it, and integrators spend the next six months filing support tickets that could have been answered by better documentation. OpenAPI exists to break that cycle by making documentation a first-class artifact of the API itself.

Rate limiting is one of those features that looks optional until the moment it becomes mandatory. Without it, a single misbehaving client — a misconfigured retry loop, a runaway script, a bad actor — can degrade or take down your API for every other consumer. With it, you define the boundaries of acceptable usage and enforce them automatically. For any API exposed to more than one consumer, rate limiting is infrastructure, not a feature.

Standard HTTP is a request-response protocol: the client sends a request, the server sends a response, the connection closes or is returned to a pool. This model is efficient for most API use cases. It is the wrong model when the server needs to push data to the client without waiting for a client request — live dashboards, chat applications, collaborative editing, real-time notifications, trading feeds. Three patterns exist to bridge this gap, each with a different complexity profile and a different set of constraints.

REST APIs organize their surface around resources — the nouns of your domain. How you identify, name, and structure those resources determines whether your API feels intuitive or requires constant documentation reference. Good URL design is not aesthetic preference. It is communication: URLs tell developers what the API contains, how it is organized, and how to navigate it. Done well, a developer can infer what endpoints exist from the ones they already know.

Every API starts with a choice that will shape every decision that follows: what protocol are you building on? REST, GraphQL, and gRPC are the three dominant options in modern API development, and none of them is universally correct. Each reflects a different set of assumptions about who is calling the API, how often, and what they need back.

Understanding the tradeoffs is not optional knowledge for serious API developers. It is the foundation.

Every integration eventually confronts the same question: how does my system learn that something changed in someone else’s system? The two answers are polling and webhooks. Polling asks the question repeatedly. Webhooks get notified when the answer changes. Understanding which approach fits a given situation — and why — shapes everything from latency and cost to reliability and operational complexity.

Polling: The Default That Mostly Works

Polling is the simpler mental model. Your application sends requests to an API on a schedule — every 30 seconds, every minute, every hour — and checks whether anything has changed since the last check. If yes, process the changes. If no, wait for the next interval.