We have a lot of knowledgeable users in our community, but with the transition to this new forum, there isn't a central place to find developers interested in freelance work for OJS / OMP / OCS. PKP Services offers Sponsored Development, but I'm sure there are others on this forum available for custom programming projects. If you are, reply to this post with your experience and interest. With a few replies we can probably get a good list of offerings which will be easily searched on this site.
Bonus points to developers and clients who are mutually interested in contributing enhancements back to the core products.
(Note: I personally am not available for freelance work.)