Design a rate limiter API

Overview

Design a rate limiter API makes more sense when you see where it fits in production engineering and real-world system design. The goal is not to memorise a definition. It is to understand what is happening and why it matters.

Use these projects to practise turning a product idea into a clear backend plan.

Build a fair request limit that still works when your app runs in more than one place.

How it works

Understand the moving parts.

Design a rate limiter API affects rate limiter. The system still does the main work, but this idea changes where that work happens and what you can notice about it.

In simple terms, pay attention to rate limiter, Redis, sliding window. These are the parts that shape speed, reliability, and the choices you make when something goes wrong.

It also connects to the bigger picture: put the earlier lessons together by designing products people use every day. Learning the surrounding topics makes this one easier to use in real work.

Common pitfalls

Watch for these assumptions.

• Learning the name without understanding what it changes in a real system.
• Skipping the question of what happens when traffic, delays, or failures increase.
• Thinking rate limiter, Redis, sliding window work separately when they usually affect one another.