You need to build an cryptocurrency exchanges similar to functionality of bitfinex (poloniex/bittrex/hitbtc)
An exchange should have an websockets API and REST API ( with very good documentation )
Also should have
Fill or Kill
Supported trading cryptopairs:
BTC, ETH, XRP, BCH, LTC, DSH, NEM, XMR, BCC, NEO, IOTA, ETC, OMG, QTUM, ZEC, LISK, WAVES, ARK, STRATIS, EOS, TENX, DCR, KNC, CVC, BNT, ZRX
No margin trading for now
An exchange should meet the latest safety standards, also it should carry out security audit.
More info im pm.
Bid only if you had similar experience in this field for at least 5++ years
3 freelancers are bidding on average $17124 for this job
I will build the need to build an cryptocurrency exchanges similar to functionality of bitfinex Relevant Skills and Experience c++ , C , php Proposed Milestones $21764 USD - milestone