Developer Avoids Wasted Work After Old Docs Hid a Already-Failed Trading Strategy

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A Tokyo-based software engineer who builds AI-driven trading bots in his spare time nearly spent hours re-implementing a strategy he had already tested and rejected. While reviewing his personal documentation file, he found a 10xATR trailing exit strategy marked as promising and not yet implemented, prompting him to start coding. A nagging sense of déjà vu led him to search his old validation logs, where he discovered the strategy had previously produced a near-breakeven profit factor of 0.97–0.99, making it a net loser over many trades. The problem stemmed from a failure to update his idea-tracking document after backtesting, leaving stale, misleadingly positive notes in place. The incident highlighted how solo developers, lacking peer reviews, are especially vulnerable to documentation inconsistencies that can go undetected for weeks or months.

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