In Brazil, there are many titles used for the person responsible for a certificate but they are generally a 'clerk'.

also used

I'm almost sure the title refers to a clerk, sometimes called "escrivão" or "oficial" in Brazil's bureaucracy. The other term is worthy of some further consideration:

titular: (adj.) Que ocupa um cargo efetivo (professor titular).
https://www.aulete.com.br/titular

This concept translates into English as "tenured". Tenured professor, for example.

Example Sentences

"As initially drafted, subsection d.(1) in the Appendix, below, addressed the situation in
Given, in which a tenured clerk voluntarily transferred to a new tenurable position, but was involuntarily returned to her original position before she could obtain tenure..." https://static1.squarespace.com/static/596f60f4ebbd1a322db09...

"At issue here is the Appellant‟s employment termination following what appears to be a series of events, including her reinstatement after a lay off and provisional promotions in which the Appellant went from being a tenured Clerk and Typist to Acting Personnel Director. " https://www.mass.gov/doc/berrios-jeannette-v-city-of-holyoke...

Other examples: https://www.google.com/search?q="tenured clerk"

Just because a Justices' Clerk in England and Wales serves first-instance Magistrates-only doesn't mean Justices cannot reflect a higher-level of Justiça.

As nominally a UK civil servant, whether a Justices' Clerk is tenured or stipendiary, so paid, need not come into the equation.