You need to have a designated SQF Practitioner (SQFP) and a designated back up. Both need to have completed 2 day accredited HACCP course. This is to oversee the SQF implementation and maintenance. Outside of that the SQFP can be any number of varying roles. I am at a smaller company and my title is QA Manager, I am the SQFP, PCQI (FDA-FSMA), R&D, HACCP Team Leader, Food Defense Coordinator, just to name a few. It is nice to have designated folks covering each role, however not always practical from a business standpoint as we have to wear many hats. You can define the roles however you like to fit your needs you just have to have an SQFP and B/U SQFP.
2.1.1.4 code reference......
2.1.1.4
Senior site management shall designate a primary and substitute SQF practitioner for each site with responsibility and authority to:
i. Oversee the development, implementation, review, and maintenance of the SQF System;
ii. Take appropriate action to ensure the integrity of the SQF System; and
iii. Communicate to relevant personnel all information essential to ensure the effective implementation and maintenance of the SQF System.