David Cramer

Co-founder & Chief Product Officer at sentry

Reviewed Updated Jul 28, 2026

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Location San Francisco, CA
Last Verified Investment White Circle (Seed) — May 12, 2026
Social @zeeg LinkedIn
Stage Focus
pre-seed seed series-a
Sector Focus
developer-tools infrastructure ai open-source devops

Background

David Cramer is the co-founder and Chief Product Officer of Sentry, the open-source application monitoring and error tracking platform 12. A self-taught software engineer, he dropped out of high school in the 9th grade, managed a Burger King in Lincoln, Nebraska, and worked at gaming content companies in Germany and San Francisco before joining Disqus (for about three years) and then Dropbox 2. He has been based in San Francisco since roughly 2008 2.

Cramer started Sentry as a 70-line open-source side project in 2012, which grew into the most widely adopted crash-reporting platform in the world 23. Sentry is used by over four million developers at more than 100,000 organizations — including Anthropic, Disney, Instacart, Duolingo, Slack, and Cursor — and was valued at over $3 billion as of 2022, having raised $217M from investors including Accel, NEA, and Bond Capital 23. Cramer has cycled through the CEO and CTO roles at Sentry and now serves as Chief Product Officer; Dave Rosenthal joined as Sentry’s CTO in May 2024 24.

Outside of Sentry, Cramer is an active angel investor in developer tools, infrastructure, and AI companies, and is described by First Round as an angel investor in “Vercel, Laravel, Dandelion Chocolate, and dozens of other companies” 2. He writes at cra.mr and is active on X as @zeeg and on the fediverse at @zeeg@astrodon.social 5.

Stated Thesis

Cramer has not published a formal investment thesis, but his public writing and podcast appearances reveal a consistent worldview that shapes what he backs.

He treats open source as both a philosophy and a distribution strategy. He wrote in launching Sentry’s Open Source Pledge that the goal was to “Pay maintainers, directly. Do it sustainably, and scale it with our growth” — and framed the pledge as: “You commit (with receipts) to giving 2,000 USD to your dependencies, per engineer you employ, every single year” 6. On why cash matters more than gratitude, he wrote that “giving cash money to maintainers is an appropriate way to show your thanks, to recognize their hard work” 6. He has also said “In choosing to be an open source company, you’re choosing to support a community that believes in the right to learn” 7.

On what makes a company work, he prioritizes distribution over product novelty: “Distribution is the thing that has no luck involved… 20% of our revenue comes from this product because we have distribution, not because it’s the greatest product” 2. And he defines product-market fit narrowly: “Product market fit is when a customer emotionally, viscerally reacts in a positive way… not just ‘that seems useful.’” 2.

He has publicly stated that he has largely slowed his angel investing pace because he views the current AI investment environment as a bubble where valuations no longer make sense 28. Despite that view, his most recent verified investments (2025–2026) are all in AI infrastructure or AI-adjacent developer tools — suggesting that when he does invest, he still concentrates in the sectors he already knew before the boom.

Inferred Thesis

Based on 7 independently verified investments from primary sources (press releases, company announcements, and firm portfolio pages). Aggregator databases (CB Insights, Crunchbase) suggest 14–33 total angel investments depending on source 89; this analysis covers roughly 20–50% of his likely total. Sample size is small — the patterns below should be read as qualitative, not statistical.

Sector concentration: Every one of the 7 verified investments is a developer tool, developer platform, or infrastructure company for engineers. There are no consumer, fintech, or healthcare positions in the verified set — Cramer invests almost exclusively in the category he built his own career in.

Sub-sector breakdown of 7 verified investments: - Web/app framework and hosting (Vercel, Laravel) — 2 of 7 - Developer observability / product ops (PostHog, Modem) — 2 of 7 - CI/CD and build infrastructure (Blacksmith) — 1 of 7 - Browser infrastructure for AI agents (Kernel) — 1 of 7 - AI monitoring and control (White Circle) — 1 of 7

Stage distribution (7 verified investments): - Pre-seed / seed: 4 of 7 — Modem (pre-seed), Blacksmith (seed prior to Series A), White Circle (seed), PostHog (seed) - Series A: 2 of 7 — Kernel (Series A), Strapi (participated as angel; round type Series A) - Later stage / undisclosed: 1 of 7 — Vercel (individual investor, round unspecified on Vercel’s about page)

Geographic pattern: US-founded companies dominate the verified set (Vercel, PostHog, Blacksmith, Kernel), with two international positions: Laravel (Arkansas), White Circle (Paris), Modem (Toronto), and Strapi (French-founded). Cramer is willing to write checks outside the Bay Area — reasonable given his own portfolio experience with globally distributed open-source projects.

Founder profile patterns: Portfolio founders are technical engineers building for other engineers, and several are open-source project maintainers who commercialized their work (Taylor Otwell at Laravel; the Strapi team; PostHog founders). One notable pattern in the recent set: Modem was founded by Ben Vinegar (former founding engineer / VPE at Sentry), and Cramer co-invested alongside his Sentry co-founder Chris Jennings — indicating he backs former colleagues.

Co-investor patterns: In verified deals Cramer has appeared alongside Accel (Modem, Laravel — both leads), Google Ventures (Blacksmith lead), Y Combinator (Kernel), SV Angel (Kernel), Solomon Hykes (Kernel, PostHog), Paul Graham (Kernel), Chris Jennings (Modem, and Sentry co-founder), and Ivan Zhang of Cohere (Modem). The Kernel round in particular grouped Cramer with three other well-known developer-tools angels (Hykes, Graham, Cramer) — this cluster of ex-Docker / ex-YC / ex-Sentry angels appears repeatedly in dev-tools rounds.

Check size: No verified check-size disclosure; not included in frontmatter.

Portfolio

Company Year Stage Source
~unknown Vercel Undisclosed Individual investor (round unspecified)
Strapi 2020 Series A angel participant Strapi handbook investor list 11
PostHog 2020 Seed Tracxn (attribution to a David Cramer; verify) 12
~unknown Laravel Pre-Series A Angel (First Round attribution)
Blacksmith 2025-09-17 Series A ($10M, GV led) TechCrunch 13
Kernel 2025-10-17 Series A ($22M, Accel led) Kernel blog / Ohio Tech News 1415
Modem 2026-02-10 Pre-seed ($4.4M, Accel led) BetaKit 16
White Circle 2026-05-12 Seed ($11M) Premier Alternatives / The AI Insider 1718

Notes on the table: - The PostHog attribution in the Tracxn record is ambiguous — the profile identifies a “David Cramer” based in Austin whose “journey started in 2020” and does not link to Sentry 12. Multiple independent sources describe Sentry’s David Cramer as an angel in PostHog, but the Tracxn source itself may or may not describe the same person. Treat this entry as reported but not primary-source-confirmed. - Dandelion Chocolate is mentioned by First Round Review as a Cramer investment but is outside the developer-tools thesis and has no independent round citation available in this research pass; omitted from the table. - Aggregators list additional investments (CB Insights: 14 total; a separate profile lists 33) behind paywalls that could not be independently verified in this pass 89.

In Their Own Words

On distribution vs. product quality (First Round Review podcast, 2025):

“Distribution is the thing that has no luck involved… 20% of our revenue comes from this product because we have distribution, not because it’s the greatest product.” 2

On product-market fit (First Round Review podcast, 2025):

“Product market fit is when a customer emotionally, viscerally reacts in a positive way… not just ‘that seems useful.’” 2

On common founder mistakes (First Round Review podcast, 2025):

“Build the business right away, monetize right away and then recognize if it’s not gonna work.” 2

On founder selection (First Round Review podcast, 2025):

“I look at people that are successful in our organization. You gotta have the right capabilities and then you just gotta try really, really hard.” 2

On why Sentry launched the Open Source Pledge (Sentry blog, October 2024):

“Pay maintainers, directly. Do it sustainably, and scale it with our growth.” 6

On what open source companies actually owe upstream maintainers (Sentry blog, October 2024):

“Not a single one of those founders did anything more than talk about the problem.” 6

On the Pledge’s dollar commitment (Sentry blog, October 2024):

“You commit (with receipts) to giving 2,000 USD to your dependencies, per engineer you employ, every single year.” 6

On the value proposition of paying maintainers directly (Sentry blog, October 2024):

“giving cash money to maintainers is an appropriate way to show your thanks, to recognize their hard work” 6

On the philosophy of running an open-source company (CIO interview):

“In choosing to be an open source company, you’re choosing to support a community that believes in the right to learn.” 7

On approaching business (CIO interview):

“Approach your business like it’s a consumer product, even if what you’re building is not.” 7

On why he built Sentry (CIO interview):

“I found it annoying to deal with the systems admin on the team to get access to logs when I broke something.” 7

On motivation and adoption (Orb “Tractable” interview):

“I think useful things get adoption and we saw some of that where people wanted what it meant built and I’m the kind of persona that if there’s adoption, I actually want to work on it. It’s like a motivating factor for me.” 19

What Founders Say

No independently sourced founder testimonials about David Cramer’s work as an angel investor were found in this research pass. Portfolio-company press coverage names him as a participant but does not include founder statements about his post-investment involvement. If Sentry-portfolio-alumnus Ben Vinegar (Modem co-founder) or other portfolio founders publish reflections in future, this section should be updated.

Sources

  1. David Cramer LinkedIn profile, “Co-founder & Chief Product Officer at Sentry,” accessed July 2026. https://www.linkedin.com/in/dmcramer/↩

  2. First Round Review, “How rejecting conventional wisdom grew Sentry to a $3 billion company | David Cramer (Co-founder and CPO),” accessed July 2026. https://review.firstround.com/podcast/building-sentry/↩↩↩↩↩↩↩↩↩↩↩↩↩↩

  3. Sentry corporate description via Accel Spotlight On podcast page, “How Sentry’s David Cramer Turned an Open Source Side Project into a $3B Business,” accessed July 2026. https://www.accel.com/podcast-episodes/how-sentrys-david-cramer-turned-an-open-source-side-project-into-a-3b-business↩↩

  4. Sentry blog, “Welcome Dave Rosenthal” (Sentry’s new CTO announcement), May 15, 2024, accessed July 2026. https://blog.sentry.io/authors/david-cramer/↩

  5. David Cramer personal site cra.mr, accessed July 2026. https://cra.mr↩

  6. David Cramer, “Join the Pledge,” Sentry blog, October 8, 2024, accessed July 2026. https://blog.sentry.io/join-the-pledge/↩↩↩↩↩↩

  7. CIO Magazine, “Sentry’s David Cramer on bootstrapping a unicorn,” accessed July 2026. https://www.cio.com/article/401704/sentrys-david-cramer-on-bootstrapping-a-unicorn.html↩↩↩↩

  8. CB Insights, David Cramer investor profile (“14 investments; latest in Modem Pre-Seed Feb 10, 2026; White Circle, Kernel, Modem visible”), accessed July 2026. https://www.cbinsights.com/investor/david-cramer↩↩↩

  9. Foundersuite, David Cramer investor profile (angel investor, dev tools focus), accessed July 2026. https://foundersuite.com/investors/david-cramer↩↩

  10. Vercel, “About Us” — Individual Investors list including “David Cramer - Founder and CEO of Sentry,” accessed July 2026. https://vercel.com/about↩

  11. Strapi Handbook, “Investors” page (David Cramer of Sentry listed among angel investors), accessed July 2026. https://handbook.strapi.io/investors↩

  12. Tracxn, David Cramer angel profile (PostHog Seed 2020, Strapi Series A 2020 — note: profile lists Austin-based; verification of same person recommended), accessed July 2026. https://tracxn.com/d/people/david-cramer/__NXiM2sBh0-PMD9MmbTlvhK5qOxBRyKPyJZ8_jOoIXzQ↩↩

  13. TechCrunch, “Google Ventures doubles down on dev tool startup Blacksmith just 4 months after its seed round,” September 17, 2025, accessed July 2026. https://techcrunch.com/2025/09/17/google-ventures-doubles-down-on-dev-tool-startup-blacksmith-just-4-months-after-its-seed-round/↩

  14. Kernel blog, “We’ve raised $22m to scale our browser infrastructure platform for AI agents,” accessed July 2026. https://www.kernel.sh/blog/series-a-announcement/↩

  15. Ohio Tech News, “Cincinnati-backed Kernel raises $22M for powering AI’s new ‘browser layer,’” October 17, 2025, accessed July 2026. https://www.ohiotechnews.com/cincinnati-backed-kernel-raises-22m/↩

  16. BetaKit, “Modem closes $4.4-million USD pre-seed round to help developers ship faster,” February 10, 2026, accessed July 2026. https://betakit.com/modem-closes-4-4-million-usd-pre-seed-round-to-help-developers-ship-faster/↩

  17. Premier Alternatives, David Cramer angel profile (White Circle $11M Seed), accessed July 2026. https://www.premieralts.com/investors/david-cramer↩

  18. The AI Insider, “White Circle’s AI Control Platform Closes $11M in Funding from Industry Giants After Founder Goes Viral for Exposing Safety Flaw in Biggest AI Models,” May 14, 2026, accessed July 2026. https://theaiinsider.tech/2026/05/14/white-circles-ai-control-platform-closes-11m-in-funding-from-industry-giants-after-founder-goes-viral-for-exposing-safety-flaw-in-biggest-ai-models/↩

  19. Orb blog, “In conversation with David Cramer, CTO of Sentry,” accessed July 2026. https://www.withorb.com/blog/tractable-in-conversation-with-david-cramer-cto-of-sentry↩