Rex Salisbury is a former Andreessen Horowitz partner who founded Cambrian Ventures after building one of the largest fintech founder communities in San Francisco, starting as grassroots meetups years before launching the fund. He combines early-stage fintech investing with a founder-community-first model, plugging portfolio companies into his curated network of fintech builders and operators while running his own podcast and YouTube channel to stay connected to the ecosystem.

• Focus on fintech infrastructure and payment dynamics. Closely follows industry shifts, such as analyzing the strategic rationale behind Capital One acquiring Brex and how Stripe's new managed payments feature removes administrative burdens like sales tax and fraud for merchants.
• Skepticism regarding software businesses built specifically for AI agents. Argues that selling to AI agents is a difficult business model because they are hyper-rational and drive competition to the point of zero margin, whereas selling to human consumers remains profitable because they are imperfect and irrational.
• Strong interest in housing supply and proptech. Frequently discusses the economics of real estate, suggesting that increasing supply is the only real solution to affordability and defending institutional investors who build new single-family rental homes rather than just buying existing ones.
• Support for solo founders, particularly in pre-seed fintech. Views being a solo founder as an advantage that allows for extreme speed and total accountability, while leaving more room on the cap table to attract top talent.
• Attention to practical AI applications in professional workflows. Highlights tangible use cases where AI outperforms humans in tedious tasks, such as Carta sending tax documents in January instead of August or Claude analyzing complex Excel files to determine retail expansion locations.
• Observations on public versus private market mechanics. Discusses how retail options trading impacts volatility and notes that fintech valuations can be counterintuitive, where companies with free products sometimes hold significantly higher valuations than those with paid products.