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Short biography
De’Mondre Zimmerman, also known as DJ, is a San Antonio software founder and independent quantitative researcher. He builds StopHarbor and Global Ticket Pay, and publishes research on systematic trading, execution, and result measurement through Zimmër Trading.
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Extended biography
De’Mondre Zimmerman (DJ) is a software founder and independent quantitative researcher based in San Antonio, Texas. He founded StopHarbor, a route-planning workspace for small field teams, and Global Ticket Pay, a traffic-citation lookup and payment service. Both are operated by GTP Systems Inc. His software work focuses on connecting product design and engineering to the practical steps people need to complete.
Through Zimmër Trading, Zimmerman develops trading infrastructure and publishes independent working papers on prediction markets, execution, position sizing, and accounting. His recent work reconstructs a small live-trading sample and examines how observed results change under different sizing and measurement conventions. The papers distinguish live records, simulations, and retrospective comparisons, and explain the limits of the available evidence. His latest working paper includes a public market-level ledger and code for reproducing its published calculations.
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Businesses and research
StopHarbor: route planning for small field teams.
Global Ticket Pay: traffic-citation lookup and payment assistance.
Zimmër Trading: independent systematic-trading research and software.
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Selected working papers
Ten Minutes to Give It Back · November 2, 2026. Includes a public ledger and replication package.
How an 88% Win Rate Lost Money · November 2, 2026.
Building a Research Process for Energy Markets · September 21, 2026.
These are independent working papers. Their methods, evidence, and limitations are described in each paper. Browse all writing.
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Interviews and professional enquiries
For introductions, interviews, software projects, or research collaborations, contact dj@globalticketpay.com.
LinkedIn · GitHub · Full biography
Updated .