SBT mods must be very strutured and must follow the stringent standards in SBT. this is you major concern first. Even though SBT is in VFP6, it is not very objhect orientatad and does not use the features in the newer foxpro/ it is really just an update of the foxpro 2.6 code that has not changed much. So a programmer that knows accounting, VFP, Foxpro 2.6 and especially mods in SBT is what you need. Look for someone that comments code very well and knows how to use standards and naming conventions set forth by SBT.
If you can use an offsite consultant, I can handle your needs remotely. I have worked with SBT for 10 years now and VFP since 3.0 beta. See my resume posted on my site http://www.cwcconsulting.com