I have been looking at job advertisements in many different places, amongst others on a website mainly dedicated to jobs in development.
Inevitably there are a lot of advertisements for English teachers. Though it is not the job I'm looking for I found the varying requirements interesting.
The first one I saw was everything wrong with the attitudes of language schools in China.
The two requirements were:
19 years
native speaker

An actual qualification in teaching English was not needed. Nor any understanding of the English language. Here is a good way to understand my frustration:
Grab a random college student and ask him/her to prepare a lesson about the difference between present perfect and simple past.
Or uses of the conditional tense. Or any other topic which might be of interest for English learners.
Now find a non native teacher with an English teaching degree and do the same.

The next advertisement actually had more sensible requirements, but the formulation of those were... unusual:

Native English speakers or close to

You had better have a degree (BA/MA) in English or Education.

You'd better have a TESOL / TEFL / CELTA certificate of be certified as a licensed teacher.

You'd better have some teaching experience.

Lastly there was an ad, which left all options open. Native speaker is desirable, but not required, teaching qualification are desirable, but not required, Chinese language skills are...

you get the idea.

It would be interesting to write 10 applications with different combinations of those requirements and see which get an answer.