The sentence is long and convoluted (though not incomprehensible), thus it could do with a few commas here and there so as to make it clearer. Plus, since it's definitely formal writing, it could be a tad bit more polite: Before I confirm (my attendance at) the interview, would you please be so kind as to send me a description of the job, so that I could determine whether it is in keeping with my qualifications and expectations.
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