Hi,
I can show you my previous works on Bitcoin platforms and Payment concept.
I have already worked on a website similar to poloniex that is exchange website and i can show you demo.
I have also completed many application based on Bitcoin wallet and Bitcoin payment tracking systems.
I am familiar with many popular api's of blockchain, bitgo, blockcypher and blocktrail.
let us chat if you want good quality works.
Thank you,
Rohan