Fundraising Fox

Joshua Ibrahim

Founder

Founder at Manifold

Los Angeles Metropolitan Area

FoundedManifold · YC

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.

LinkedIn ↗

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 · 1

Y Combinator

Co-founders at Manifold

NYNicolas Yeh
Nicolas YehFounder

Experience

  1. ManifoldCo-Foundercurrent2026 — presentLos Angeles, California, United States
  2. CaltechGraduate Student Researchercurrent2021 — presentPasadena, CA
  3. Courant Institute of Mathematical SciencesUndergraduate Researcher2021New York City Metropolitan Area
  4. University of PennsylvaniaUndergraduate Researcher2020 — 2021Greater Philadelphia Area
  5. University of PennsylvaniaESE 210 Dynamical Systems Teaching Assistant2020 — 2021
  6. University of PennsylvaniaESE 112 Engineering Electromagnetism Teaching Assistant2020
  7. Goldman SachsEngineering Essentials Program2020New York, United States
  8. Morgan StanleyEarly Insights Program2020New York, United States
  9. FacebookSoftware Engineering Intern2020New York City Metropolitan Area
  10. FacebookSoftware Engineering Intern (FBU)2019 — 2020Greater Seattle Area
  11. Jane StreetSpring Education Event2019Greater New York City Area
  12. Two SigmaNew Seekers Summit2019Greater New York City Area
  13. 3700 Industries LLCCo-Founder and CTO of 3700 Industries2018 — 2019Greater Philadelphia Area
  14. Carnegie Mellon UniversityCarnegie Mellon SAMS2017

Education

  1. CaltechDoctor of Philosophy - PhD, Applied Mathematics2022 — 2027
  2. University of PennsylvaniaBachelor's degree, Systems Engineering2018 — 2022
  3. Half Hollow Hills High School East2014 — 2018

Skills & more

Microsoft PowerPoint5Microsoft Excel5Leadership16Research16Public Speaking17Teamwork11English5

From Joshua's professional profile.

Founder mafias

Y Combinator mafia8,668

Also came through, then founded or led a company.

Sam AltmanPresidentFounded LooptFred EhrsamYC Summer 2012Founded CoinbaseMatt HuangYC Winter 2011Founded HotspotsTrae StephensYC Winter 2022Founded PursuitDelian AsparouhovYC Summer 2014Founded Nightingale +1Justin KanYC Winter 2018Founded Rye +3

+ 8,661 more

Goldman Sachs mafia180

Also came through, then founded or led a company.

Fred EhrsamTraderFounded CoinbaseMatt HuangSummer AnalystFounded HotspotsAndrew JonesTechnology AnalystFounded Adaptive Security +1Spencer RascoffInvestment BankerFounded House Whisper +1Gordon WintrobSummer Analyst, Investment BankingFounded Newfront +1Sheridan ClayborneSpecial Situations Group AnalystFounded Lendtable +1

+ 173 more

University of Pennsylvania mafia157

Also came through, then founded or led a company.

Eric HeilBSEFounded Ladderbio +1Scott Wolf, MDBAFounded Aerin Medical +1Abhijeet DwivediMastersFounded Central +1Ross ChaninB.A.Founded Reputation Com +1Alexander BelangerBachelor's degreeFounded Hatchet +1Brianna LinMathematics and Computer ScienceFounded Copperlane +1

+ 150 more

Caltech mafia53

Also came through, then founded or led a company.

Chris VoigtPhDFounded Asimov +2Bill GrossBachelor of Science (B.S.)Founded X1 +2Seth LieblichDoctor of Philosophy - PhDFounded Protomer +1Shyam SrinivasanBSFounded Zitara +1Evan MurphyBSFounded Zitara +1Ayan BandyopadhyayBachelor’s DegreeFounded Finic +1

+ 46 more

Same school

Also attended Caltech133

Shaun MaguirePartner at Sequoia CapitalScott BillerInvestor at GV (Google Ventures)Seth LieblichInvestment Team at 8VCMarkus EnzelbergerPartner at Versant VenturesWen HsiehFounding Managing Partner at Matter Venture PartnersHaomiao HuangFounding Partner at Matter Venture Partners

+ 127 more

Also attended University of Pennsylvania764

Dasha MaggioPartner at Felicis Ventures, writer on venture capital and founder psychologyNancy WangInvestor at Felicis VenturesEghosa OmoiguiFounder and Managing General Partner at EchoVC PartnersAkshat GoenkaInvestor at Moonfire VenturesJames KuklinskiInvestor at Spark CapitalKerry KilleenAssociate General Counsel at Revolution

+ 758 more

Also attended Half Hollow Hills High School East2

Jonathan BavaroAccounting Manager at Founder CollectiveJessica DeVillaInvestor at Alix Ventures

Shared employers

Also worked at Manifold1

Nicolas YehFounder at Manifold

Also worked at University of Pennsylvania112

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

+ 106 more

Also worked at Goldman Sachs1,429

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 ParadigmNiki PezeshkiGeneral Partner at Felicis VenturesChris BischoffInvestment Team at General Catalyst

+ 1,423 more

Also worked at Jane Street53

Leigh Marie BraswellPartner at KPCBIvory TangInvestor at ChemistryChang XuPartner at Basis Set VenturesAlexander GuInvestor at E14 FundChris ClarkInvestor at FalconX Credit / Pareto VaultMina NguyenInvestor at FalconX Credit / Pareto Vault

+ 47 more