That is the course.

You have run the whole arc: discovery, an integration that survives a real environment, a deployment somebody else has to operate, and the conversation where you defend the trade-offs. That is the job.

Nothing here is a certificate, because a certificate from us would not mean anything. What you have instead is the vocabulary to follow a real deployment conversation, and the judgment to know which question the room is actually asking. Go use it on the question bank, then go use it on a loop.

If it was useful, send it to the person you know who is interviewing. That is the whole marketing budget.