App for hiring workers

My company is looking to hire Freelancers for an upcoming project. We need to set up a payment system for our workers, as well as a way to track their performance. The payment system should be secure, reliable, and easy to use. Additionally, our tracking system needs to be detailed and comprehensive, so that we can get accurate and up-to-date information about how our Freelancers are performing. We need someone with experience in setting up and managing these types of systems to help us.