HFT or High-Frequency Trading method
A human can't handle HFT without any EAs or High-speed internet connection. Even if you are a super expert in trading, you won't be able to manage it because it takes less than a second between opening to closing order. Only Expert Advisors or artificial intelligence robots can do it within a microsecond.
HFT or High-Frequency Trading Software can be brought from various people. Although one needs to have some prerequisites to be able to make the most of your purchase. Firstly, you should know a programming language. You should be well versed with its usage and how to apply it in stock markets. Second, you should have a few strategies in the pipeline before you finalize a setup that you wish to trade upon. Thirdly, you should have a strong internet connection and probably be set up closer to the stock exchange. The reason for that is that for HFTs and UHFTs speed of data is key and is located at a remote location might put you behind others on receiving this data. All in all, getting into HFT is an expensive affair and should only be done when you think you have all the resources in the right places.
The primary strategies used by HFT shops are Statistical Arbitrage and Market-Making. Stat-Arb traders model complex relationships between large numbers of securities, and when those relationships make slight divergences from their historical averages the trader bets on a return to normalcy. Stat-Arb can be considered a subset of mean reversion and grew out of Pairs Trading. One popular measure of dependence between securities is cointegration (for example using the Augmented Dickey-Fuller test). And linear regression is often used to model the security relationships.
Market-Making is the practice of quoting both bid and offer prices and capturing the spread between them. The market-maker must model the volatility of the markets he quotes, the arrival rate of new information to the market, and the arrival rate of aggressive orders.
A smaller number of firms specialize in latency arbitrage, but due to the winner-take-all nature of the strategy, all of the profits accrue to a handful of top-tier firms.
You can buy high-frequency trading software and even if you want any modification or you want to make your own application according to your need then also it is possible eg. if you have your strategy and you want to execute that strategy by multiple accounts, in this case, it is possible for you to do this thing.
So, you may contact Sri Technocrat for this, It is an organization that helps individuals and corporate to make their own app/application according to their needs.