I moved your topic to the "OTRS Marketplace" which is better suited for your topic. The "OTRS Developers" forum is for people who work on the code or would liek to learn this. sorry, I know this difference is not obvious.
Regardings your question I would recommend to give at least some details like the OTRS version you use, what kind of development you need, how to contact you (via forum ?) and perhaps in which country. This also ensures that you really need development, perhaps users will tell you this can be done via customization.
To find a company you can :
- ask the OTRS company group (http://www.otrs.com/solutions/services/development
- look for other companies (Google for "OTRS development")
- wait for companies or developers to answer your offering in this forum
- look in the forum for companies and developers