business software ceation

I'm looking for a freelancer to create a business software for me according to my specific needs. The main purpose of the software is project management. I need the software to be highly customizable, with features that will meet all of my organization's needs. The estimated completion timeframe for this project is more than 3 months. I'm looking for a freelancer who can develop this software with an attention to detail and an understanding of the importance of this project for my business.
I need the software to be customizable, as every project has a different scope of works, and i require our staff be able to access on a laptop or tablet and have real time collaboration.