Crypto currency exchange

I'm looking to build a centralize crypto currency exchange and need help to make it a reality. I have a clear vision of what I want, as I require API integration, need the exchange to be built on multiple chain platforms such as Bitcoin, Ethereum, and Ripple, and need the project completed within 1-3 months. I'm looking for a web developer or programer who has the expertise to help me achieve my goal of completing this crypto currency exchange.