QuantConnect And Cloud Backtesting Lab

You have written strategy scripts before, maybe in TradingView or a pandas notebook where you loop over a DataFrame of bars. QuantConnect breaks that habit on purpose. Under the hood it runs LEAN, an event-driven engine that owns the clock and calls your code one data slice at a time, so you cannot peek ahead even by accident. This course takes the discretionary system you built earlier and re-expresses it as an algorithm the cloud runs for you, then puts that algorithm through the same interrogation an institutional desk uses: honest fills, honest costs, a point-in-time universe, robustness testing, walk-forward, paper trading, live constraints, and a review board. You end with one deliverable — a validated research packet whose verdict, promising or abandoned, survives scrutiny.