A person who carves personal or official seals (hanko/inban). This is a traditional craft occupation.
My grandfather, as a seal engraver, has carved many personal seals.
はんこ屋 is a more common, casual term for a seal shop or seal maker, whereas 印判師 sounds more traditional and craft-oriented.
Compound of 印判 (inban, 'seal' or 'stamp') and 師 (shi, 'master' or 'specialist').