I have been working with Traccar, and other open source GPS software for the last 4 years.
You mention in the project description that you need software developed, what exactly do you need developed?
If all you need for now is Traccar installed and configured, I can do that fairly quickly. The 3 day time frame is for testing.
This bid is to install, and configure Traccar on a CentOS 7 VPS only.