Present perfect vs simple past has nothing to do with duration, but with time. If an action or event is definitely completed in the past (that is, it is clearly finished and there is no need to explain to the reader that it is finished), then use simple past tense: your job is finished and your duties there are finished-- therefore, use simple past: 'I
worked' and 'my duties
included'.
Whether the event happened in 1955 or 1995 or 1905, the winning is long ago completed: use simple past tense: 'my project
won'.
That is all there is to it. The uses of present perfect ('has done') and past perfect ('had one') are beyond the range of resume discussion here. Have a look at
VERB TENSES