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Tag: backtesting

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Top 3 backtest engines for 2026: VectorBT, NautilusTrader, and LEAN

After-work architecture choice: VectorBT for research sweeps, NautilusTrader 2.0 for live-aligned fills, LEAN for cloud multi-asset. Not a remake of the five-tool stack or the look-ahead article.

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Why AI-written backtests leak look-ahead — and why that equity curve is not a strategy

Generated backtests often fill at a price you already knew, or use tomorrow's close. QuantConnect closed a stale-price loophole on daily and hourly data for that reason. After work, the skill is point-in-time Python — a pretty curve is not a strategy.