I ran into three pitfalls while building my first quantitative system.

Pitfall 1: Overfitting
The backtest looked unbelievably good, but the system fell apart as soon as it went live.
The reason: the parameters were tuned too closely to historical data.

Pitfall 2: Ignoring fees
Each trade made $50 in the backtest, but after fees, only $15 was left in live trading.
Returns were cut by 70% outright.

Pitfall 3: No stop-loss logic
“The quantitative system won’t make reckless trades.”
Then one market move wiped out 20%, and I learned that quant strategies can get liquidated too.

The SYS series was built gradually, after running into these three pitfalls.
Without pitfalls, there would be no system.

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