Solidworks Addin c#

I'm looking for a developer to create a custom Solidworks addin in c#. It should feature a UI interface, The end result should be a high quality and professional-grade piece of software, designed to meet my specific needs and requirements. If you are interested i'll give you more details, to evaluate price, time and other needed.
Unfortunately I am forced to write a price, but I would prefer to agree it with the customer