To Build an exchange one should have follwoing skills.
1. Strong knowledge in full stack development. I am a full stack developer having 16 years of experience in building enterprise level scalable applications by using React, Angular. Node and .Net Platforms
2. Strong knowledge in Creating and maintaining the wallets for various cryptos like BTC, ETH, LTC etc. Where i have already worked on all these and the exchange made by me is in live.
3. Strong in the Cloud based Architectures. I have worked with ELB on AWS and implemented the complete exchange on the AWS ennviroment.
4. Understanding of crypto trading principles like Stop Orders, Sell Orders, Limit orders etc. We already implemented those features.
Apart from all those we have good commitment towards to work with high professional approach which makes me best for your requirement.
Awaiting for your response.