Please PM me if you have experience pen testing sites/exchanges/apis. This ought to be an easy job because you'll get the source code to the entire site.
Specifically looking for experience with BTC full-node wallets.
I have a bit of experience with this. What is the site coded in?
c#. Do you have any references for previous work in this field?
Personally I don't have references for work with C#, mainly PHP and other web languages such as Ruby on Rails. If you would like, I can still go over your code for free as I have a bit of spare time although C# is probably one of my less proficient languages.