Here is one but not for equities https://tradinglite.com/. Source: almost 3 years ago

I saw some of the members of this community are using https://tradinglite.com/ to scan for sell walls, also in the past. Something called trading x-ray. Source: about 3 years ago

I use https://quantconnect.com/ to backtest new algos and discover new algos. They support C# and python. Source: over 1 year ago

Use quantconnect.com, their API forces you to use OOP there so it's a good practice. Source: almost 2 years ago

For stocks and crypto: QuantConnect and Backtrader For options: MesoSim and OptionNetExplorer. Source: almost 2 years ago

Only you can teach you how to do it. quantconnect.com has a lot of tutorials and other documentation that should be enough for you to learn from. I'm still learning the process of backtesting and I'm not aware of an "easy" way to perform this type of work. Source: almost 2 years ago

Thanks for the pointer. quantconnect.com and interactive brokers. I have a little fantasy that I'll do this once I retire and hand over 1% of my nest egg to it; see how it does... Hand over some more, etc... Source: over 2 years ago