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Cyriel Notteboom

Founder

Founder at Radical

Seattle, Washington, United States

FoundedRadical · YC

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About

Cyriel Notteboom is CTO at Radical, a company developing high-altitude solar-powered aircraft. He previously spent six years at Amazon Prime Air working on mechanical design and structural analysis for delivery drones.

Founder at RadicalYC W23

Intro paths

YC

Cyriel went through Y Combinator (Winter 2023) — any YC alum in your network can reach them through the YC community.

GP

Their group partner at YC was Jared Friedman, YC Group Partner — the partner who ran Radical's batch and knows the company first-hand. YC profile ↗

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In turn, Cyriel can intro founders to Radical's investors below.

Radical's investors · 11

Andreessen HorowitzMenlo Park · $500K – $50M checksBessemer Venture PartnersSan Francisco · $50K – $100M checks · since 2026BoxGroupNew York · $250K – $1M checks · since 2026ConvictionSan Francisco · $1M – $25M checks · since 2026Entrepreneur FirstBengaluru · $1M – $7M checksInflection.xyzBoston · $500K – $2M checksRadical VenturesToronto · $1M – $25M checks · since 2026Scout VenturesAustin · $2M – $5M checksScout VenturesAustin · $2M – $5M checksVertis SGRNaplesY CombinatorSan Francisco · $500K checks · since 2023

Co-founders at Radical

JTJames Thomas
James ThomasFounder
SJ
Simone JensenFounder

Frequently asked questions

Who is Cyriel Notteboom?
Cyriel Notteboom is CTO at Radical, a company developing high-altitude solar-powered aircraft. He previously spent six years at Amazon Prime Air working on mechanical design and structural analysis for delivery drones.
Where does Cyriel Notteboom work?
Cyriel Notteboom is Founder of Radical.
What companies did Cyriel Notteboom found?
Cyriel Notteboom founded Radical.

Founder mafias

About this profile. Compiled from public sources — Radical's own website and public professional profiles — and summarised by Fundraising Fox; every fact is kept with where it came from. Spotted an error, or would rather not be listed? Email privacy@fundraisingfox.com · How we build profiles · Your rights