We are an Enterprise software company in the electronic payments space. We have an open-source library and some not open-source products around it. We are growing a lot and have all resources coping with inbound leads and requests for work. Don't plan to raise funding so I won't build an in-house marketing team.
I've seen many specialized boutique firm in the PR area, with a nice pricing model, etc. I need to improve white papers, products PDF sheets, automatic emails design and flow, website, Powerpoint/Keynote presentations, etc.
Any suggestions? Best if it's USA located.