1 Anonymous since I have been treasurer for this company five or so years ago. Since I became treasurer for this company five or so years ago. (since you dated the sentence [five or so years ago], you are fixing this part of the sentence in the past, so you must use a past simple and not a present perfect.
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Anonymoussince I have been treasurer for this company five or so years ago.Since I became treasurer for this company five or so years ago. (since you dated the sentence [five or so years ago], you are fixing this part of the sentence in the past, so you must use a past simple and not a present perfect.