Having wasted 6 years of my life intensively working to create an algorithmic trading system (and failing to make it consistently profitable), what they have here is the easy part. You need a system for discovering strategies. That's were almost all your effort will go. The simulator for backtesting, integrating with a broker, etc. is such a small part of it, if you're serious about it, you're probably better off writing your own.

This is the right comment.

This is also why people in algo trading that are able to discover or already know working strategies, they are paid big bucks.