Hello
I have intermediate to expert knowledge on MWS. I have been working on it past 4 years with .NET platform.
Here are some aspects i worked before.
Downloading reports, uploading feeds, SQS notifications, throttling limits, FBA reports, creating shipmentplans using API, printing FBA labels, repricing.
If required i can research and solve your problems. I have my own Amazon Selling business have access to MWS as professional plan. I got many questions answered by MWS team.
So, i am comfortable to say i can provide my inputs to make your development fast and go in right direction.
Let me know.