Paul Klein IV, founder & CEO of Browserbase, announces their $40M Series B at a $300M valuation led by Notable Capital. Browserbase has raised $67.5M in total funding in just 15 months (!!) since founding the company. Existing investors include big Silicon Valley funds like Kleiner Perkins, CRV, Basecase, and more. Paul shares how Browserbase is powering the next generation of AI agents and “vibe coders” by providing programmable, cloud-hosted browser infrastructure—what he calls “Twilio for headless browsers.” Special thank you to John at Strike Capital for the introduction, as well as Bucky Moore and Turner Novak for some incredible questions. This is an awesome interview. We cover: * How Browserbase works and real-world automation use cases * Round dynamics, fundraising strategy & investor support * Their all-star angel network: Jeff Lawson (Twilio), Patrick Collison (Stripe), Guillermo Rauch (Vercel), founders of Okta, Stitch, WorkOS, and more * The evolution of their brand (emoji story) * Go-to-market strategy and scaling past 1,000 customers * Launching Director.ai for “vibe coders” * The future of AI agents, authentication, and automation * Paul’s solo founder journey and team culture in SF Whether you’re building an agent, automating legacy workflows, or just curious how infra startups are scaling fast in AI, this one’s for you. Check out Browserbase: https://www.browserbase.com/ Molly on X: https://x.com/MollySOShea Paul on X: https://x.com/pk_iv Brought to you by: Brex—The modern finance platform, combining the world’s smartest corporate card with integrated expense management, banking, bill pay, and travel. As a Sourcery listener, you can unlock up to $500 toward Brex travel or $300 in cash back, plus exclusive perks to help you move even faster: https://brex.com/sourcery Kalshi—The largest prediction market and the only legal platform in the US where people can trade directly on the outcomes of future events: https://kalshi.com/sourcery Fourthwall—The #1 way to sell merch online — Fourthwall is the easiest way to launch a fully branded merch store—used by big brands like MKBHD, Acquired, & even the Smithsonian. 100+ products. No upfront cost. Visit Fourthwall to start today: https://fourthwall.com/ Follow Sourcery for the latest updates! https://www.sourcery.vc/ TIMESTAMPS: 00:00 - Series B Fundraise Announcement 02:21 - Introduction to Browserbase 04:04 - Use Cases & Applications 07:56 - Customer Growth & Product Development 10:48 - GTM & Branding Strategies 22:53 - AI Agent Ecosystem & Authentication 28:08 - AI Regulation & Deep Fakes 30:07 - Launching Director AI 30:54 - Empowering Vibe Coders 33:52 - Customer Service & Team Composition 41:28 - Why Founding a Startup Should Be Last Resort 44:38 - Managing Performance As A Solo Founder 48:38 - Future Outlook & Kalshi Predictions #Browserbase #AIInfrastructure #PaulKlein #Startups #Automation #SeriesB #AIagents #DeveloperTools #VibeCoders #podcast #investing #technology #venturecapital #entrepreneur #startup #siliconvalley
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