Spot Crypto Exchange Engine Build

I’m building a new crypto exchange and my number-one focus is the trading engine. The platform will launch with spot trading only, so the matching engine, order book management, and execution logic must be rock-solid and low-latency from day one... (Budget: $3000 - $5000 USD, Jobs: API Development, Blockchain, C++ Programming, Cryptocurrency, Docker, PostgreSQL, RESTful API, Software Architecture)