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 · 8
Bessemer Venture PartnersRedwood City · $5M – $100M checks · since 2026BoxGroupNew York · $1M checks · since 2026ConvictionSan Francisco · $1M – $25M checks · since 2026Inflection.xyzBoston · $500K – $2M checksRadical VenturesToronto · $1M – $25M checks · since 2026Scout VenturesAustin · $2M – $5M checksScout VenturesAustin · $2M – $5M checksY CombinatorSan Francisco · $500K checks · since 2023
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Co-founders at Radical
JT
James ThomasFounder
Experience
- RadicalCo-Founder & CTOcurrent2022 — presentSeattle, Washington, United States
- AmazonSenior Hardware Development Engineer2020 — 2022Seattle, Washington, United States
- AmazonHardware Development Engineer II2017 — 2020Seattle, Washington, United States
- AmazonHardware Development Engineer I2016 — 2017Cambridge, England, United Kingdom
- AmazonHardware Development Engineer2015Cambridge, England, United Kingdom
- KU LeuvenResearch Scientist2014Leuven, Flemish Region, Belgium
Skills & more
Drone Piloting1Aerospace Structures1Finite Element Analysis (FEA)1Computer-Aided Design (CAD)1Laser Cutting13D Printing1Ansys Mechanical1FEMAP1Mechanical Engineering10Aerospace Engineering9Product Design6Project Management4
+8 more
SOLIDWORKSCATIAJulia (Programming Language)Python (Programming Language)Multi-Disciplinary OptimizationMatlabSolid EdgeSimulinkLanguages Dutch · English · French · German
- Part 107 Remote Pilot Certificate — Federal Aviation Administration
- Level 1 Avalanche Certification — American Avalanche Institute
From Cyriel's professional profile.
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.
- Where did Cyriel Notteboom go to school?
- Cyriel Notteboom studied at Y Combinator (W23); KU Leuven (Master after Master, Management); KU Leuven (Master of Science - MS, Mechanical & Aerospace Engineering).
Founder mafias
Y Combinator mafia8,773
Also came through, then founded or led a company.
Sam AltmanPresidentFounded Tools for Humanity +3Jessica LivingstonCo-founderFounded Y CombinatorAlexis OhanianYC Summer 2005Founded RedditFred EhrsamYC Summer 2012Founded Nudge +1Matt HuangYC Winter 2011Founded HotspotsTrae StephensYC Winter 2022Founded Pursuit +1
+ 8,766 more
Y Combinator mafia4,716
Also came through, then founded or led a company.
Ryan SheaEntrepreneurshipFounded StacksTarek MansourFounded KalshiSuhail DoshiEating beans & riceFounded Playground +1Subomi OluwalanaW22Founded ConvoyDarius "Bubs" MonsefS19Founded Sightbox +3Matthew ScholzFounded Oisin Biotechnologies +3
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KU Leuven mafia24
Also came through, then founded or led a company.
Pieter AbbeelBS/MSFounded Gradescope +1Peter VanbekbergenFounded Imec Xpand +1Dieter De MesmaekerMaster in Industrial SciencesFounded DataCamp +1Herman VerrelstMaster in EngineeringFounded BiocartisChiara BagainiBachelor of Business Administration - BBAFounded RepathLaurens De PoorterBachelor (BSc) & Master of Science (MSc)Founded Belfort
+ 17 more
Same school
Also attended Y Combinator2,000
Tarek MansourCo-founder & CEO of KalshiSuhail DoshiFounder of Mixpanel; founder of ParticleSubomi OluwalanaCo-founder & CEO of ConvoyMaroof AhmedFounder at Octopus VenturesJustin SwartPartner at Bitkraft Esports VenturesCollin WallaceGeneral Partner at Lobby Capital
+ 1,994 more
Also attended KU Leuven176
Katrin GeyskensExecutive Director at Capricorn Venture PartnersSimon WoutersInvestment Manager at Capricorn Venture PartnersSteven LambertInvestment Partner Digital at Capricorn Venture PartnersAntoine D'HollanderInvestment Director at Capricorn Venture PartnersWouter Van de PutteInvestment Director at Capricorn Venture PartnersFilip PintelonInvestment Partner Health at Capricorn Venture Partners
+ 170 more
Also attended Technical University of Munich283
Daan BoekhoudtInvestment Analyst at Cottonwood Technology FundJulian von EckartsbergManaging Director Europe at Burda Principal InvestmentsHannes Voucko-GlocknerInvestment Analyst at Burda Principal InvestmentsThomas MeierPartner, Head of Resilience in Energy & Resources Investments at Verve VenturesNiklas Born de AndrésInvestment & Product Intern at Kibo VenturesItziar EstevezPartner - Growth at Iris Capital
+ 277 more
Also attended Creative Destruction Lab16
Sahaj KumarInvestment Manager at Counteract OneSophie HughesInvestment Analyst at Seroba Life SciencesChristy LaneVenture Partner at IA Capital GroupFaye PuAssociate at Clairvest Group IncGreg HannaDirector at Interactive Niagara Media Cluster o/a Innovate NiagaraJoyce Zhang GrayGlobal Expansion at Aurelia Ventures
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+ 10 more
Shared employers
Also worked at Radical2
Also worked at Amazon645
Apoorva MehtaFounder of Instacart; founder of Cloud Health SystemsBinny BansalCo-founder of Flipkart; co-founder of PhonePe and OppDoorBrad PorterFounder & CEO of Collaborative RoboticsJane MooneyCo-founder & VP, Strategy and Finance at Collaborative RoboticsNick FrosstCo-founder of CohereDave MunichielloInvestor at GV (Google Ventures)
+ 639 more
Also worked at KU Leuven39
Katrin GeyskensExecutive Director at Capricorn Venture PartnersWouter Van de PutteInvestment Director at Capricorn Venture PartnersKobeFinance Director at Hummingbird VenturesPieter AbbeelAlumni at HouseKatleen VandersmissenManaging Partner at Heran PartnersHerman VerrelstFounding Partner & Senior Advisor at Heran Partners
+ 33 more