João Santiago-Sagi יוחנן סנטיאגו-שגיא
Founder and Software Engineer
Hey there 👋, I'm João (b. 2001, Brazil), a software engineer with 6+ years of experience building efficient, scalable solutions.
I started coding at 13, earned a Computer Science degree, and have spent 6+ years building products end-to-end: from the first whiteboard sketch through system design, backend architecture, frontend, CI/CD, and the observability layer that tells you what's actually happening in production. I've taken products from zero to hundreds of thousands of users while staying close to the code the entire time.
Your business, answering itself. D3 Labs builds AI agents that chat on WhatsApp, reply to Instagram DMs and pick up the phone — closing sales and support tickets while you sleep.
Open-source interactive quiz funnel builder for entrepreneurs and marketers. Build high-converting quizzes without writing a single line of code.
Open-source alternative to Typeform. Build high-converting forms and surveys, free and self-hostable.
If you have any questions or if you want to just chat, feel free to drop me a line at joao@joaosantiago.com.br.