I have done the test, It's pretty straight forward. My recommendations are:
1- I believe the solution can be improved to be used by Institutions such as Universities to store hash of the student's certificates for validation purposes and when someone go to the Stellar blockchain and verify the transaction code that is printed in the certificate he can see: The Institution issuer, the student name and a screenshot of the document.
2- Once the hash is created it should not be public on the application dashboard only the owner of the document can see it.
3- I hope the UI/UX gets improved once it goes live
Overall is a good experience I wish you all the best. For any XLM rewards my wallet is:
Looking forward to see the solution in production.