What are you offering in the way of compensation? Equity, standard contract rates? The people around here tend to be fairly ambitious self-starters, so you aren't going to find anyone brilliant who is going to agree to WFH without substantial pay.
Even equity wouldn't be enough, because in that case, they'd expect to be taken on as a co-founder.
This may not be the best place to look for a developer if you just want someone to work for wages. People don't come here for a J-O-B.
I'd look into dice, RAC, and domain specific forums (DSP, video processing, etc) if you want to hire somebody. They'd likely leap all over you.
Good luck.
Edit: Also, I don't think your word choices are suited to your audience either. Vague jargon like "execute" reeks of MBA and makes people not want to do business with you.
Use verbiage that is descriptive of what you're actually going t do. If you're a master wheeler-and-dealer, say so. Don't say "execute", say that, "I'm going to market the crap out of this and I need someone who is hardworking and ambitious enough to make a platform to match that."
Your use of the word 'engage' is also similarly MBA'ish. Try instead a word like, 'hire' or 'contract'.
2nd Edit: I just looked at the RFP. You're trying to hit a bear with a whiffle bat. Formalized documents are inappropriate and come off as stuffy in communities like this. Also, it lacked critical details that are relevant to the developer. Like compensation.
Don't force people to copy and paste a link just so that they can know the details or nitty-gritty of what it is you want. Instead, link to a blog post or include it in the thread post.