It's easy to find them (e.g. LinkedIn, Google etc.) but, just like I advise clients that are looking for development partners to do projects, you should really take the time to work out your criteria for selecting the right partner and the questions you want to ask them before approaching them.
Also, in your case, you should be clear on the benefits to them of partnering with you. There will be a cost, in time at least, so they need to see a clear benefit.
Happy to discuss further on a call.