Paul Klein IV applied to 500 internships and got rejected from 498. Now he's the solo founder of Browserbase – a headless browser infrastructure company for AI agents – valued at $300M in under 14 months. He didn't choose to be a solo founder. He tried to find a co-founder and couldn't. In this conversation, he explains why that turned out to be the right thing.

Topics covered:

• Why Paul thinks first-time founders should not be solo founders
• The five-tool founder concept: product, sales, fundraising, hiring, and operations
• StreamClub founding story and lessons from having co-founders
• How a 3,000-word memo validated the Browserbase idea
• Solo founder by circumstance: trying and failing to find a co-founder
• Hiring philosophy: contractors as work trials, DM recruiting on Twitter
• Fundraising as relationship building, not a tight process
• Company culture: emotional vulnerability, second chances, non-traditional backgrounds
• The quarterback to head coach to GM evolution of a solo founder CEO
• Operating cadence: daily standups, weekly syncs, monthly all-hands, quarterly board meetings
• Brand building through word of mouth
• The honest case for and against solo founding

Guest: Paul Klein IV, Solo founder and CEO of Browserbase. Former CTO/co-founder of StreamClub (acquired by Mux). Former software engineer at Twilio.

Notes & more from this episode: https://solofounders.com/blog/from-500-rejections-to-a-300m-company-paul-klein-iv-on-solo-founding-browserbase/

Apply to Solo Founders Program: https://solofounders.com/program