Hi. You mentioned ZeroMQ. What transport mechanism are you using (IPC, TCP, etc.)? And what is the distribution pattern (publish-subscribe / request-reply / etc.)?
The systems you are trying to integrate ... Are they open-source projects that I can study myself or inhouse/proprietary packages? Has any work begun on the messaging functionality already?
I have been writing software on Linux, intermittently, for about 10 years - comfortable with gcc / g++ / gdb, Berkeley sockets, etc..
If you think I can help feel free to send me more details. I may need to revise my bid (price and/or duration) based on the further info you provide.
I am based in Ireland - so operate in GMT time - Mon - Sat regular hours.