About
Joshua Ibrahim holds a PhD in Applied Mathematics from Caltech and previously interned as a software engineer at Facebook on Messenger and Instagram systems. He also earned MS and BS degrees in Electrical and Systems Engineering from Penn.
Founder at ManifoldYC S26
Intro paths
YC
Joshua went through Y Combinator (Summer 2026) — any YC alum in your network can reach them through the YC community.
GP
Their group partner at YC was Jon Xu, General Partner at Y Combinator — the partner who ran Manifold's batch and knows the company first-hand. YC profile ↗
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In turn, Joshua can intro founders to Manifold's investors below.
Manifold's investors · 9
Calibrate VenturesPasadena · $5M checksCherry VenturesBerlin · $2.2M – $7.7M checks · since 2026Costanoa VenturesSan Francisco · $500K – $8M checks · since 2026Industry VenturesSan Francisco · $250K – $50M checksModern TechnicalSan Francisco · $500K – $1M checks · since 2026Rain CapitalBellevue · since 2026Reach CapitalSan Francisco · $100K – $12M checksTq Ventures LlcNew YorkY CombinatorSan Francisco · $500K checks · since 2026
Co-founders at Manifold
NY
Nicolas YehFounder
Experience
- ManifoldCo-Foundercurrent2026 — presentLos Angeles, California, United States
- CaltechGraduate Student Researchercurrent2021 — presentPasadena, CA
- Courant Institute of Mathematical SciencesUndergraduate Researcher2021New York City Metropolitan Area
- University of PennsylvaniaUndergraduate Researcher2020 — 2021Greater Philadelphia Area
- University of PennsylvaniaESE 210 Dynamical Systems Teaching Assistant2020 — 2021
- University of PennsylvaniaESE 112 Engineering Electromagnetism Teaching Assistant2020
- Goldman SachsEngineering Essentials Program2020New York, United States
- Morgan StanleyEarly Insights Program2020New York, United States
- FacebookSoftware Engineering Intern2020New York City Metropolitan Area
- FacebookSoftware Engineering Intern (FBU)2019 — 2020Greater Seattle Area
- Jane StreetSpring Education Event2019Greater New York City Area
- Two SigmaNew Seekers Summit2019Greater New York City Area
- 3700 Industries LLCCo-Founder and CTO of 3700 Industries2018 — 2019Greater Philadelphia Area
- Carnegie Mellon UniversityCarnegie Mellon SAMS2017
Skills & more
Microsoft PowerPoint5Microsoft Excel5Leadership16Research16Public Speaking17Teamwork11English5
From Joshua's professional profile.
Frequently asked questions
- Who is Joshua Ibrahim?
- Joshua Ibrahim holds a PhD in Applied Mathematics from Caltech and previously interned as a software engineer at Facebook on Messenger and Instagram systems. He also earned MS and BS degrees in Electrical and Systems Engineering from Penn.
- Where does Joshua Ibrahim work?
- Joshua Ibrahim is Founder of Manifold.
- What companies did Joshua Ibrahim found?
- Joshua Ibrahim founded Manifold.
- Where did Joshua Ibrahim go to school?
- Joshua Ibrahim studied at Caltech (Doctor of Philosophy - PhD, Applied Mathematics); University of Pennsylvania (Bachelor's degree, Systems Engineering); Half Hollow Hills High School East.
Founder mafias
Y Combinator mafia8,773
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Goldman Sachs mafia249
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Carnegie Mellon University mafia231
Also came through, then founded or led a company.
Kai-Fu LeeResearch Computer Scientist / Assistant ProfessorFounded 01Lucy GuoComputer ScienceFounded Passes +1Joshua XuMaster's degreeFounded HeyGenWilliam GuttmanDistinguished Service Professor of Economics & Special Advisor to ProvostFounded CurvePoint +3Dr. Manu KumarBSFounded K9 Ventures +2Rodney BrooksResearch ScientistFounded Rethink Robotics +2
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University of Pennsylvania mafia201
Also came through, then founded or led a company.
Kunal BahlSystems EngineeringFounded SnapdealScott Wolf, MDBAFounded Cardiac Dimensions +3Ben LererBSFounded Thrillist +1Eric HeilBSEFounded Ladderbio +1Trevor PriceB.A.Founded Quilted Health +1Lyle BerkowitzBSEFounded Apollo Health +1
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Caltech mafia66
Also came through, then founded or led a company.
Dario AmodeiProgress towards BSFounded AnthropicFei-Fei LiDoctor of Philosophy - PhDFounded World LabsBill GrossBachelor of Science (B.S.)Founded X1 +5Chris VoigtPhDFounded Asimov +2Seth LieblichDoctor of Philosophy - PhDFounded Protomer +1Gil ElbazBSFounded TenOneTen Ventures +1
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Same school
Also attended Caltech144
Shaun MaguirePartner at Sequoia CapitalDario AmodeiCo-founder & CEO of AnthropicFei-Fei LiCo-founder & CEO of World Labs; Sequoia Professor of Computer Science at StanfordScott BillerInvestor at GV (Google Ventures)Seth LieblichInvestment Team at 8VCMarkus EnzelbergerPartner at Versant Ventures
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Also attended University of Pennsylvania824
Brian ActonCo-founder of WhatsApp; co-founder of Signal FoundationKunal BahlCo-founder of Snapdeal; co-founder of Titan CapitalDasha MaggioPartner at Felicis Ventures, writer on venture capital and founder psychologyNancy WangInvestor at Felicis VenturesLeah von SiemensPartner at Manta Ray VenturesEghosa OmoiguiFounder and Managing General Partner at EchoVC Partners
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Also attended Half Hollow Hills High School East2
Shared employers
Also worked at Manifold1
Also worked at University of Pennsylvania122
Wesley BarrowPartner at Correlation VenturesDavid MagermanManaging Partner at Differential VenturesNuan ZhangInvestor at Episode1Vyas RamananVenture Partner at Third Rock VenturesLouis BernemanFounding Partner at Osage University PartnersBrian HalakManaging Partner at Medical Excellence Capital
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Also worked at Goldman Sachs1,505
Josh KushnerFounder & CEO of Thrive CapitalSarah GuoFounder & General Partner of ConvictionFred EhrsamCo-founder and Senior Advisor at Paradigm; founder of NudgeMatt HuangCo-founder and Managing Partner at ParadigmDavid VélezFounder & CEO of NubankTarek MansourCo-founder & CEO of Kalshi
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