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01 /HERO

Leandro
Duarte

Portuguese founder. Builder. From selling vegetables to shipping AI.

5 ventures
1 exit at 20
600k views
3:34 marathon

Featured Projects

Tenho Média Pa'Isto

Built Portugal's leading education podcast — 600k+ views helping a generation choose their future.

Tenho Média Pa'Isto studio
600k+ views
12.3k subscribers
67 episodes
4.98 Spotify

Created and led a 5-person team for 2.5 years.

View project

Sonant AI

2nd engineer at an AI startup. Raised ~$5M. Moved to San Francisco. Built the product from zero.

Sonant AI team in San Francisco
Role

5th person in. Full codebase ownership: Python, FastAPI, LLM logic, TTS/STT, agent workflows.

Silicon Valley

Lived at Stanford campus. Worked from Pear VC office. Company raised ~$5M.

Impact

43% staff productivity gain. 8X ROI in 30 days. Featured in Forbes.

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Centro de Explicações Online

Spotted a gap during COVID. Built an online tutoring platform. Sold it within a year.

20+ tutors
100+ students
<1yr to exit
20 years old

COVID lockdown hit. Every tutoring center in Portugal had a terrible website and suddenly needed to be online. The podcast started as marketing for this business — a hack that became its own thing. Now operates as Portal da Sabedoria.

View project

Now

Bootstrap & sell Early stage & scale Series A & learn Found my own thing

Mimo

AI Engineer · Series A · Stockholm

AI Engineer at a Series A fintech that raised €18M+. Building AI workflows for accounting automation in Go, Node.js, and Python. 30-person team across Stockholm and London.

MSc Data Science

KTH Stockholm + UPM Madrid · EIT Digital

Double degree. GPA 4.6/5 at KTH, 8.8/10 at UPM. Innovation & Entrepreneurship minor. GenAI for Startups summer school at University of Glasgow.

Ithaca

Legal Tech AI · Founded 2025 · EIT Digital Venture

Next: founder.

Leandro in Stockholm

I grew up selling fruits and vegetables at village markets since I was eight. No one dragged me to tech. I wanted to lead and be the best at something. So I built five ventures, sold one at twenty, went to Silicon Valley at twenty-four, and I'm not done.

Questions I Get Asked

What have you actually built?

Online tutoring platform — built, scaled, sold at 20.

Educational podcast — 600k+ views, led 5-person team for 2.5 years.

Web3 gaming startup — Web Summit 2022, Draper University, full MVP.

Legal tech AI platform — EIT Digital Venture Programme.

AI voice product at Sonant — full-stack from zero, company raised $5M.

Hash Game Store at Web Summit 2022

What makes you different as a founder?

Not a typical tech background. Came from selling vegetables, earned every step.

The progression: bootstrap and sell, then early stage and scale, then Series A and learn. Ready to found.

Strong friendships are the asset. I already have a shortlist of people to build with — co-founders, growth, sales, design.

Marathon finish — Seville 2024, 3h34m

What was your hardest period?

Three years ago. Finishing a mathematics bachelor at IST, selling the tutoring center, 42 School, running the podcast, starting Hash Game Store, helping the family business. Five or six things at once with no safety net. It kind of went well.

Competitions and awards?

JUNITEC: Junior Enterprise of the Year — European Excellence Awards 2024 and 2025.

Web Summit 2022 Alpha Startup.

Draper University Silicon Valley programme.

Portuguese Youth Parliament Finalist (2015, 2018).

Football District Champion (2015, 2018). KTH captain, Rome 2024.

KTH football team captain, Rome 2024

Education

All done in parallel with ventures and full-time work.

2024 — now

MSc Data Science

Double degree: KTH Stockholm + UPM Madrid. EIT Digital programme. GPA 4.6/5 (KTH), 8.8/10 (UPM). Innovation & Entrepreneurship minor.

2019 — 2023

BSc Mathematics & Computation

IST, University of Lisbon — the hardest maths programme in Portugal. GPA 15/20.

2021 — 2023

42 Network School

Lisbon. Selected 50 out of 150 applicants. Peer-to-peer coding. Done alongside bachelor.

2023

Deep Learning & MLOps

DeepLearning.AI + Google. 160 hours. Andrew Ng.

2022 — 2023

Azure AI + Data Scientist

Microsoft Certified. 120 hours.

2018 — 2019

BSc Applied Mathematics

FCUL, Lisbon. GPA 18/20, top student. Transferred to IST for a harder programme.

Timeline

2005

Started working in family business, age 8

2015

Football District Champion

2015

Youth Parliament Finalist

2018

Started BSc Mathematics at FCUL — GPA 18/20

2019

Transferred to IST — hardest maths in Portugal

2020

COVID → Founded Centro de Explicações Online

2021

Sold tutoring center — first exit at 20

2021

Created Tenho Média Pa'Isto podcast

2021

Entered 42 School — selected 50/150

2022

Founded Hash Game Store

2022

Web Summit 2022 — Alpha Startup

2022

Joined JUNITEC — Junior Enterprise

2023

Graduated BSc from IST

2023

Podcast ends — 600k+ views

2024

Master's at KTH Stockholm

2024

Joined Sonant AI — 5th member

2024

Seville Marathon — 3h 34m

2025

San Francisco — Stanford + Pear VC

2025

Founded Ithaca

2026

Joined Mimo — Series A

Let's build
something.

If you're a founder, investor, or builder — I'd love to hear what you're working on.

© 2026 Leandro Duarte Built from scratch