I have a doubt: should I write:
- I worked as a teacher, as housekeeper manager, as a Rep, etc.
- I worked as a teacher, housekeeper manager, Rep, etc.
Both versions are syntactically fine, but idiomatically native speakers would tend to "delete" all "highly predictable" repetitions of as a in such contexts (or at the very least, delete repeated as).
There's a slightly greater chance that the more verbose version would be understood as meaning I've had several different jobs - for example [blah blah], where the shorter version could be interpreted as My job involved covering several different roles - for example [blah blah]. But that might be because we always tend to look for a more "unusual" interpretation if someone uses less common phrasing, not because of anything inherent in the words themselves.
Per the comment to the question (OP's current text omits a from the second item in the list, in case that gets edited out later), I should point out that it's very unusual (some might say "invalid") to delete any repeated element from such a "list" and then re-introduce it in a subsequent element. You should probably assume you never want to do that.