Hi uktous, If there is only one opening for a trainee accountant, then it would make perfect sense to say: In response to your job posting for a trainee accountant, I have attached my resume. But if there were two or more openings, then I think it would be better to use the word 'positions': In response to your job posting for the trainee accountant positions... However, it would not be wrong to omit the word 'positions' in the second version and just say: In response to your job posting for trainee accountants, I...
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