Student or Learner
Is the sentence mentioned below is correct?
I have to post a job on the job site as we need some people for marketing.
As there is more than one job available you could say 'I have to post some jobs on the job site as we need a few people for marketing'.
I changed your 'some' to 'a few' to avoid repetition of 'some'.
Better still - specify the actual number of jobs on offer.