Dear Sir/Madam,
I have been experienced in programming including Visual Basic and .NET (code behind C# and VB.NET both my experienced area) for over 15 years. Developed many featured projects using .NET such as Human Resource management system, Time attendance system, Risk Management system and B2B marketplace.. etc.
I can develop your project using ASP.NET code behind VB.NET or C# (which one you prefer) and with database MS SQL or MySQL which one you prefer. But in my experience, using MS SQL is better. Since its the multi-user system, its better be developed in ASP.NET.
From your general declaration I understand that there should be 2 main section where Admin able to manage all the customer, and the Customers able to manage their clients. Also I assume, the Admin will create customers and will give them login info and Customers create their clients, create team for maintenance and schedule. I already have great experience for developing multi-user system in ASP.NET, I can help you to have best solution.
After you share your detail requirements with me, I will start immediately and can complete it within your requested time frame.
I strongly believe you will be satisfied with my performance.
Hope to hear from you back,
Regards, Alta