Looking to build custom indiactor/ algo

Im looking to develop an indicator that can monitor 3-4 charts. Comparing’s the OHLC in each chart’s candlestick. Looking for specific signals between the candle sticks OHLC (in each chart will look at OHLC of current and previous 2 candles) Once a specific signature betwen all the charts combined a trade is alerted on one of the 3-4 charts.