Build me a Algorithmic Trading Software for Day Trading

The software will be tracking the major indexes like NASDAQ, S&P 500, Dow Jones Industrial Average, etc along with numerous stocks. The main task of the software will be to track the upward movement of stocks and make the buy decisions on its own when certain parameters have been met. The software will allow the stocks to move higher until they start dropping when it will instantly sell them. The software needs to only track intraday price movements and it doesn’t need to bother about any predictions regarding long-term price movements of any stock.