Drupal developer | Functionality Improvement

Hello, i'm basically looking for some freelance work by a drupal developer happy to jump into a pre-existing drupal site and improve functionality.

Basically I'm looking to build a site like crowdspring.com - Which involves a user posting a 'project request' as a node. Other users can view this and then submit a 'project proposal' (or a solution) related directly to that node. So in other words is it possible to link nodes together into groups where the initial project request is a parent node and then replies or proposals for that project can be added, from either an existing node or created specifically for that project.

I have a set budget, and I want to get started ASAP. Site, Hosting, and design are already in place. I only really want to work on improving the functionality and my existing drupal skills can't help me solve this functionality problem.

If you are interested feel free to contact me and ask any further questions.