In this story, the writer is still waiting the response from the interviewers, thus I would assume he is still working. Hence shouldn't we use Je travaille tellement dur depuis quelques années ? I assume he is still working hard.... :)
Freeform Writing Exercise B2
He is talking about a period in the past 'ces dernières années'.
So this action is definitely finished. It doesn't mean that he is not still working hard but implies that the work carried out in the past years should result in him getting this job.
Bonne Continuation !
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