The marketplace for this, as compared with generic software developers, would be so small and infrequently used as to be basically nonfunctional. I would recom

The marketplace for this, as compared with generic software developers, would be so small and infrequently used as to be basically nonfunctional. I would recommend searching for terms of art such as vhdl and verilog in normal freelancer sites. Most embedded folks don’t do FPGAs, the subset that do is mostly employed in situations that don’t permit freelancing.