Ask HN: Is halontax trustworthy for preparing/filing business tax?

This year I'm planning to file Business tax myself. Found halontax.com online. Website looks good, but they are using letsencrypt certificate. Nothing wrong with the letsencrypt, but it would be more assuring if it was using a commercial cert, for a business dealing with a lot of sensitive data. Also, is there any other online tax site that you would recommend? Apologies for the double question.