Write optimized EA based on custom indicatior code I have

I have an indicator already in MT5 that signals buy and sell based on ATR 9-period and Stochastic 14-period.  I can share the code and mql5 file with you and I want to automate it. I am used to Futures markets, ideally it is optimized for NQ futures, although I may need to start and stop it manually each day to avoid having open positions past the evening maintenance break close (requires much higher margin for open contracts and positions with broker in this case). But perhaps it can work with XAUUSD also, open to discussing. 

I will backtest the code, it must be reliable in backtesting with impressive profit factor and Sharpe ratio, etc. It is very important that it backtests well.