David Hartmann

Verified people and dated competition rosters. Observations do not establish joining dates or credit for particular submissions.

ARC Prize 2025 runner-up · the ARChitects

The ARChitects’ own 2025 solution write-up credits David Hartmann under the Kaggle handle dvhrtm, alongside Jan Disselhoff (insanitycheck) and Daniel Franzen (dfranzen). The ARChitects — 2025 team solution

The team’s 2025 technical report lists David Hartmann at Lambda, Inc. The ARChitects — 2025 technical report

Observed teams

David Hartmann (ARC-AGI-3, 2026) · dvhrtm · observed October 9, 2026–October 10, 2026 Roster source

Public accounts

dvhrtm · Identity source

The ARChitects team card from the ARC Explainer Hall of Fame, featuring Franzen, Disselhoff and Hartmann — Historical ARC Hall of Fame artwork.

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