Show HN: A free ESG stock screener that publishes its losses and methodology
4 by irldexter | 2 comments on Hacker News.
Hey HN, JSS(JumpstartSignal) is a free, ESG-filtered daily stock screener. I built it after some really badly-timed quantum computing stock buys, so I felt I needed to learn more about systematic, longer-horizon approaches and the underlying technicals instead of chasing themes. Three things about it that might be of interest: 1. Methodology is fully documented at https://ift.tt/fwRBPpW 5-stage pipeline, 54 signals tested individually plus 1,836 combinations evaluated, walk-forward validation across 25 hold periods. Nothing hand-tuned to a single backtest window. 2. Many wins, misses, and losses are published as case studies e.g. https://ift.tt/706jY8G walks through the 32 times the system flagged NVDA starting at $5.44 in 2018. https://ift.tt/w32EjHM shows a -49% loss, and https://ift.tt/dPbGSZM explains why the system never flagged Tesla (it passed Stages 1 and 2 on 207 days but only peaked at 20/100 in scoring vs the 70 needed for OPPORTUNITY tier). https://ift.tt/k4hGwcE also shows the 10 best entries alongside the 10 worst. 3. A genetic algorithm picked the signal weights, but constrained to maintain alpha across multiple market regimes (otherwise it overfits to a single bull market). The constraint dropped some "best in backtest" configurations that only worked 2018-2021. Topline: 2012-2025 backtest at SPOTLIGHT + OPPORTUNITY tier produced +163% alpha vs SPY (results page has the per-trade breakdown). Daily watchlist emailed free; reports + results + case studies are publicly browsable without signup. Happy to take questions about methodology, what the system gets wrong, or why specific tickers landed where they did.
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