MediaMarktSaturn Senior Fullstack Developer interview questions

A completely inadequate homework assignment from the company. I had 1 interview with a tech team after which they sent me a home task. In which I need to build two microservices with interaction between them. The first is an ordering system with all its operations and API's, and the second is an invoicing system with a file uploading and sending function. The task also includes some other requirements, details and as well as a list of technologies you should use with their versions. Not really clear what they want to test by this task and I don't think, that any serious developer will lose his time on building this project for a chance to have next technical interview in this company.