The Founder's Notebook

The Founder's Notebook

Home
Archive
About
How do massive unicorns really get built? How to Build the Next 10-Person Unicorn in the AI era?
You can spend 10 years executing the perfect GTM flawlessly and building with passion, and still get no further than 1 month spent with the right…
 • 
Eduardo Ortiz de Lanzagorta
📖 Playbook: Raising a Seed Round 101 (in 2025)
A battle-tested playbook shaped by lessons we learned at YC & Speedrun (A16z), inspired by Paul Graham’s (PG) wisdom, and written with the scar tissue…
 • 
Eduardo Ortiz de Lanzagorta
4
📖 Playbook: How to sell your Startup? (M&A)
Our startup was acquired by a unicorn in 2023. Looking back, there are so many lessons I wish I’d known earlier—so I decided to write them all down.
 • 
Eduardo Ortiz de Lanzagorta
🧰Toolkit: 20+ Real Seed and Series A Decks From Startups That Raised Billions
Decks from successful YC, A16z, etc. startups like Airbnb, Dropbox, Brex, Lago, Apriora, and more. All vetted and seed-stage.
 • 
Eduardo Ortiz de Lanzagorta
💪 Mindset: Stop Trying to Get It Right. Fail on Purpose Instead
“Failing on Purpose” is powerful because it transforms the fear of failure into intentional action. It reframes failure as a necessary part of growth…
 • 
Eduardo Ortiz de Lanzagorta
Most Popular
View all
📖 Playbook: Raising a Seed Round 101 (in 2025)
 • Eduardo Ortiz de Lanzagorta
4
🧰 Toolkit: The Ultimate List of Investors For Your Startup (Lists)
 • Eduardo Ortiz de Lanzagorta
1
📖 Playbook: How to sell your Startup? (M&A)
 • Eduardo Ortiz de Lanzagorta
💪 Mindset: Stop Trying to Get It Right. Fail on Purpose Instead
 • Eduardo Ortiz de Lanzagorta
© 2025 Just do it
Privacy ∙ Terms ∙ Collection notice
Start writingGet the app
Substack is the home for great culture