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Paul Klein IV
founder of @browserbasehq
Startups like Prime are a great reminder that ANYONE can disrupt a space with innovative thought and great execution.

Prime IntellectNov 27, 2025
Introducing INTELLECT-3: Scaling RL to a 100B+ MoE model on our end-to-end stack
Achieving state-of-the-art performance for its size across math, code and reasoning
Built using the same tools we put in your hands, from environments & evals, RL frameworks, sandboxes & more
18.02K
> be me
> 17 year old CS major at a non-target school in 2016
> apply to 500 internships, get rejected from 500
> rejected from KP fellows
> miraculously get an offer at twilio
> it's time to cook
> twilio IPOs during internship, no equity b/c intern
> grind internship to get return offer.
> working on 500k RPS authentication system in the critical path
> senior engineers regularly destroying me in code review
> iron sharpens iron
> get return offer
> jobs not finished
> continue grinding at twilio
> make senior swe in 1.5 years (youngest ever)
> make tech lead 1.5 years after that (youngest ever)
> mfw the hedonistic treadmill of promotions isn't hitting
> global pandemic hits
> locked in a room for 3 weeks
> enter introspection arc
> start virtual events startup in early 2020 (rip)
> raise a $2m preseed
> insanely competitive and fast moving market
> now THIS is pod racing
> can't win enough market share
> pivot to prosumer live streaming software
> it's like canva, but for live streaming
> too lazy to build composition engine
> so we run the entire app inside a headless browser and livestream the browser window
> video infra devs look at me like i'm insane
> notbad.jpg
> headless browsers take up basically all my time as CTO
> now mid 2021
> can't find PMF within prosumer live streaming
> probably spending too much time working on the headless browser infra
> pitch an acquisition to our biggest supplier
> our tech would be a great sdk for building live streaming apps
> it works
> now 2022
> working on headless browsers for live streaming at mux, series D video infra company
> meet some of the best engineers ever
> everyone agrees headless browser infra sucks and nobody except me wants to touch it
> realize developer tools companies are my thing
> start a blog about infrastructure and dev tools (hawk hill ventures)
> get rejected from susa fellows, become an a16z scout instead
> invest in a new dev tools start up every month
> study their investor updates, be helpful, learn
> 2023 - chatgpt launches
> immediately using it every day
> build side project that enables airbnb hosts to let AI respond to guest messages
> name it guestguru
> airbnb integration works using a headless browser b/c no messaging APIs
> mfw headless browser enters my life AGAIN
> hits $5k mrr, sell it to one of our customers
> november 2023 - where it all comes together
> see karpathy's LLM OS tweet.
> the goat says that the browser is going to be an important tool for AI
> he doesn't even know how hard browser infrastructure is!
> write about the state of browser infrastructure and what's going to change for my weekly blog post (
> same day i write that, i hit a 8 leg parlay and win $2k on football
> must be a sign
> share my blog post with the smartest people i know, expecting them to find some major flaw in the busines
> nobody can find any holes in it
> i can't find any holes in it
> realize that everything i've done up until this point has lead to me being prepared to build a company in this space
> worked with headless browsers at scale almost daily for the last 4 years
> saw infra greatness firsthand at twilio and mux
> spent all my free time studying writing about dev tools
> realize all my story arcs converge on headless browsers
> start browserbase
> mfw everything in my life is secretly a forced tutorial for browserbase

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