Well, if you hire cheaply, you also get cheap.
The app looks technically outdated through and through, not native to iOS.
Submission of receipts: no photo upload, not even after user feedback here. Standard English answer only but feature does not appear.
Entering the accounting data is very annoying because there is a lot of information. With a modern app it could be read out and pre-filled (treatment date, etc.) using image recognition.
Weak, Barmenia can do better.