About
Jibril Moinuddin is CEO of Rational and previously founded STEMplicity Education. He attended the University of Michigan.
Founder at RationalYC S26
Intro paths
YC
Jibril went through Y Combinator (Summer 2026) β 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 β the partner who ran Rational's batch and knows the company first-hand. YC profile β
β
In turn, Jibril can intro founders to Rational's investors below.
Rational's investors Β· 1
Co-founders at Rational
CX
Christ XuFounder
Experience
- Rational (YC S26)Co-Foundercurrent2026 β present
- Buckeye AIMember of Technical Staff2026
- STEMplicity EducationFounder2023 β 2026Mountain House, CA
- Non-TrivialFellow2024
- Non-TrivialFinalist2024
- TrueFoundrySoftware Engineer Intern2024San Francisco, California, United States
Frequently asked questions
- Who is Jibril Moinuddin?
- Jibril Moinuddin is CEO of Rational and previously founded STEMplicity Education. He attended the University of Michigan.
- Where does Jibril Moinuddin work?
- Jibril Moinuddin is Founder of Rational.
- What companies did Jibril Moinuddin found?
- Jibril Moinuddin founded Rational.
- Where did Jibril Moinuddin go to school?
- Jibril Moinuddin studied at Y Combinator; University of Michigan College of Engineering (Bachelor of Science, Computer Science); Mountain House High School.
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
+ 4,709 more
University of Michigan College of Engineering mafia23
Also came through, then founded or led a company.
Milan RayBachelor's degreeFounded ParkerTom GellatlyFounded CentaurGarrison BellackB.S.E.Founded DreamWorldBrandon BusuitoBSE - Biomedical EngineeringFounded CoVerifiedCameron TaylorBachelor of Engineering (B.E.)Founded Entelexo BiotherapeuticsAdithya RamanathanMinorFounded Buzzle
+ 16 more
Milpitas High School mafia3
Also came through, then founded or led a company.
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 University of Michigan College of Engineering34
Bob StefanskiManaging Director at eLab VenturesRama SomayajulaHead of Trading at ParadigmBlaine RileyInvestor at Side Door VenturesNate RedmondPartner at Alpha EdisonHaley ProutInvestor at Gigascale CapitalJoe TouGeneral Partner at Triptyq Capital
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+ 28 more
Also attended Milpitas High School3
Shared employers
Also worked at Rational (YC S26)2
Also worked at Buckeye AI2
Also worked at Non-Trivial1
Also worked at TrueFoundry6
Avi BharadwajInvestment Director at Intel CapitalPeter BordesManaging Partner at Trajectory VenturesAabhas KhannaGeneral Partner at MyAsiaVCAnandamoy RoychowdharyManaging Director, India & APAC at Crane Venture PartnersPushpak KediaVice President at Peak XV PartnersSaurabh SharmaPartner - Head of Venture Investments at Jump Crypto
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