Development Partner - approaches people have used

Over the last few months we have created a solution that has developed very well. We are now getting some traction with this but I am finding myself more split between technical, selling, supporting trials etc. Two clients are looking at doing trials so my time will be split further in the future.

I am considering looking at setting something up with someone or an organisation to help with the technical side as the solution is becoming quite advanced and I need someone to focus on that.

Before I get 300 messages offering to help I am more interested in solutions other people have taken before I make any decision.