I applied online.

• Step 0: The recruiter sends you an email for scheduling a call with them, plus technical topics to be covered by three short questions asked by the hiring team.
• Step 1: HR call describing the role and team, and asking three technical questions.
• Step 2: Coding interview with one of the engineers in the team. The live coding takes place in HackerRank with LeetCode questions. Make sure you are familiar with the platform.

There are no examples in the interview itself. Unfortunately, my interviewer confused me with the examples, and I couldn't really understand which rate limiter implementation was required (fixed window, sliding window, token bucket, etc.).

What is a WebSocket, when do you use it, and how is it different from an HTTP call?

In DB, what is the ACID principle?

What are the RESTful API actions?

Coding. Implement a rate limiter. The interviewer gives you the method signatures.