FireHydrant interview questions

Had an initial chat with the VP of engineering who sent through a coding test with instructions to deliver a brand new feature using the FireHydrant API. After spending most of the weekend on the exercise, I received a generic rejection and was ghosted when asking for feedback. It seems like this scenario has been quite common with other candidates which is honestly pretty scummy. I would avoid this company 🚩

After initial recruiter screen, they send a git repo and a developer API key with nebulous instructions to create a new feature for the product. You're instructed to read two sites' worth of documentation, get their application running locally, design and implement a new feature, and submit a pull request--complete with tests and documentation--within 72 hours. Essentially: onboard yourself to the company, make guesses at what their data model actually looks like (because the developer API data is incredibly scarce), design and code an entire feature with minimal guidance on direction or scope, and then get a form letter rejection with zero feedback... after giving over a week's worth of work.