Thank you for posting such a clear and detailed project description, it was really helpful. Read you project description thoroughly and understand that you are looking for experienced developers with design sensibilities to build a SaaS web app to host applications and make them available to customers over internet. Our team of experts will focus on finding the right architecture for your organization, relating with your vision and understanding the problem you are solving, to provide optimal solutions suited to your needs. We will incorporate all the features listed in your requirements such as ability to assign transactions to users, create tasks etc. Furthermore, we have no problem in communicating over phone or email, however we stick to payments over freelancer :) Please ping us so that we can discuss further details. Also, share the half completed version so that we can get a better idea?