If I had a trading idea that I knew actually worked and could be programmed in Tradestation, I would try to make a deal with another trader who is also a good programmer. I would tell them, they can share the idea if they'll program it for free. Any programmer, paid or unpaid, is going to have access to your trading method anyway.
However if I was able to develop a trading idea that actually works I'm sure I would be just as able to learn to program it myself in Tradestation. I would think that it would be easier and less work to learn to program Tradestation than it is to develop a trading method that works.