# David Cramer David Cramer is the co-founder of [[Sentry]], the error tracking and observability platform. He started Sentry as an open-source project to fix his own production debugging problems, then helped grow it into the dominant error tracking platform with 4M+ developers and 150,000+ organizations across 146 countries. He blogs at [cra.mr](https://cra.mr/) on technical topics — recent posts include the launch of [[Warden]] ("Finding Vulnerabilities with Warden"), infrastructure tracing problems, and AI content optimization. He is a core voice in the [[Functional Source License (FSL)|Fair Source]] licensing movement, which Sentry pioneered as a middle path between permissive open source and proprietary licensing. ## Notable Work - **[[Sentry]]** — co-founder; the platform began as a Django error reporting tool he built circa 2010 - **[[Warden]]** — Sentry's AI-agent code review tool, released as a successor pattern to traditional SAST - **[[Functional Source License (FSL)]]** — public advocate for the FSL model used by Sentry projects ## Quotes <!-- QueryToSerialize: LIST FROM #type/quote AND [[David Cramer]] WHERE public_note = true SORT file.name ASC --> ## Books <!-- QueryToSerialize: LIST FROM #type/book AND [[David Cramer]] WHERE public_note = true SORT file.name ASC --> ## Related - [[Sentry]] - [[Warden]] - [[Functional Source License (FSL)]] ## References - https://cra.mr/ - https://github.com/dcramer - https://sentry.io/about/