Structure a 5-minute video script demonstrating a new API endpoint

What's really being asked

Interviewers want to know if you understand developer ergonomics and attention economics. Senior engineers do not just build APIs; they drive adoption. This question reveals whether you can invert an engineering mindset into an audience-first narrative, choosing sequence and depth appropriate for a busy peer who can switch tabs in ten seconds.

The full answer

A good answer hits four things in order. First, a ten to fifteen second hook that names the problem the endpoint solves and who it is for. Second, a live request and response cycle shown in a terminal or IDE within the first ninety seconds, because developers trust code more than slides. Third, a brief coverage of authentication, a single realistic error example such as a 400 bad request with a clear message, and a mention of rate limits if they exist. Fourth, a closing with a copy-pasteable curl command, a link to OpenAPI or Postman collection, and a single sentence on where to ask questions. The pacing should respect the five minute hard stop.

The mistakes people make

Red flags include opening with architecture diagrams or sprint context that delays the working example, reading aloud from a PRD or release notes, skipping error handling because the happy path is cleaner, or treating the video like a marketing demo by using buzzwords instead of concrete payload fields. Another red flag is failing to mention how a developer gets credentials or tokens, since that is the actual friction point.

What usually comes next

An interviewer might ask how you would adapt the same content into a written quickstart, how you would measure whether the video actually reduced support tickets, or what you would cut if the runtime had to shrink to sixty seconds. They may also ask how you would handle a multi-step flow that cannot fit into five minutes.

A concrete example

Imagine launching a refund endpoint for a payment API. The script opens with the sentence, You currently email support for refunds; here is how to do it in code. At thirty seconds the viewer sees a curl request with the order ID and amount. At ninety seconds the JSON response appears with the refund ID and status. At two minutes the presenter deliberately sends a string for amount, shows the 422 error with a clear message, then fixes it. At four minutes the presenter copies the working command into a pinned comment and links to the reference docs. The video ends at four forty five.