Neither OFCCP nor the regulations it enforces prescribe a certain minimum number of candidates to be interviewed for each position, or a minimum number of applicants, for that matter. That said, if you are a federal contractor, you are required to undertake outreach to certain demographic groups - minorities, women, veterans, and individuals with disabilities - depending on your coverage under EO 11246, VEVRAA, and Sec. 503, to meet your affirmative action goals. When there is a 1:1 applicant to hire ratio for a position, it tends to raise a red flag and begs the question - was outreach undertaken? Was the position listed? What is the actual applicant source pool? Situations where there is a 1:1 ratio can certainly happen. Federal contractor employers just need to make sure that they can adequately explain and support how they came about.
You can use this OFCCP audit checklist to ensure you're doing what is required to maintain OFCCP's regulations including VEVRAA, Section 503, and EO 11246. Or request a demo to streamline your compliance and recruiting efforts.