I need a RFP Writer

I work for a company that outsources software engineers and we source the engineers out of Mexico. I have a large pharma company who needs a lot of engineers. As part of that, they are asking for a proposal from us. I need a third party to help us with this.

I need someone who has some background writing proposals for large pharma companies and understands enough about IT and software engineering that they can handle formulating value proposition and identifying pain points, etc.