Fundraising Fox

Joseph McAllister

Founder

Co-Founder & CTO at MouseCat

New York, New York, United States

FoundedMouseCat · YC

About

Joseph McAllister is co-founder and CTO of MouseCat. Previously, he spent four years at Coinbase working on risk decision systems, including streaming data pipelines and fraud detection models. He studied computer science at Cornell University and founded Roo Storage, acquired by Handled in 2020.

Co-Founder & CTO at MouseCatYC W26

Intro paths

YC

Joseph went through Y Combinator (Winter 2026) — 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 MouseCat's batch and knows the company first-hand. YC profile ↗

→

In turn, Joseph can intro founders to MouseCat's investors below.

MouseCat's investors · 2

Imagination CapitalNew York · $100K – $150K checksY CombinatorSan Francisco · $500K checks · since 2026

Co-founders at MouseCat

NANicholas Aldridge
Nicholas AldridgeCo-Founder & CEO

Experience

  1. MouseCat (YC W26)Co-Founder & CTOcurrent2026 — presentSan Francisco, California, United States
  2. CoinbaseTech Lead - Feature Platform - Risk & ML2023 — 2026New York, United States
  3. CoinbaseSoftware Engineer - ML Platform2022 — 2023New York, New York, United States
  4. MicrosoftSoftware Engineer2021 — 2022Seattle, Washington, United States
  5. HandledTechnical Product Manager2020
  6. RooCo-Founder2017 — 2020
  7. MicrosoftSoftware Engineer Intern2019Greater Seattle Area
  8. Cornell University College of EngineeringUndergraduate Teaching Assistant2019
  9. World Wide TechnologySoftware Development Intern2018Greater St. Louis
  10. World Wide TechnologySoftware Development Intern2017Greater St. Louis Area

Skills & more

Python10Public Speaking8Team Leadership6Web Development5Backend Web Development4TypeScript1Node.js1Angular1GraphQL1

From Joseph's professional profile.

Frequently asked questions

Who is Joseph McAllister?
Joseph McAllister is co-founder and CTO of MouseCat. Previously, he spent four years at Coinbase working on risk decision systems, including streaming data pipelines and fraud detection models. He studied computer science at Cornell University and founded Roo Storage, acquired by Handled in 2020.
Where does Joseph McAllister work?
Joseph McAllister is Co-Founder & CTO of MouseCat.
What companies did Joseph McAllister found?
Joseph McAllister founded MouseCat.
Where did Joseph McAllister go to school?
Joseph McAllister studied at Cornell University (Bachelor's degree, Computer Science); Mary Institute and St. Louis Country Day School (MICDS) (High School).

Founder mafias

Y Combinator mafia9,496

Also came through, then founded or led a company.

Sam AltmanPresidentFounded Tools for Humanity +3Garry TanPresident & CEOFounded Y Combinator +1Jessica LivingstonCo-founderFounded Y CombinatorAlexis OhanianYC Summer 2005Founded RedditFred EhrsamYC Summer 2012Founded Nudge +1Matt HuangYC Winter 2011Founded Hotspots

+ 9,489 more

Cornell University mafia326

Also came through, then founded or led a company.

John ZimmerBSFounded Lyft +1Hanson S. Gifford, IIIBSMEFounded Miramar Labs +2Ian JanickiBachelors of ArchitectureFounded Outfit +2Ryan XueBachelor of Science (B.Sc.)Founded Andco +2Don MuirDyson School of BusinessFounded Arc +2Uri LopatinBAFounded Pardes Biosciences +1

+ 319 more

Coinbase mafia76

Also came through, then founded or led a company.

Balaji SrinivasanCTOFounded Counsyl +1Fred EhrsamCo-founderFounded NudgeBrian ArmstrongCo-founder & CEOFounded NewLimitKuberan MarimuthuEngineeringFounded Hashcube +2Surojit ChatterjeeChief Product OfficerFounded Ema +1Rob WitoffChief ArchitectFounded Chalktalk +1

+ 69 more

Handled mafia2

Also came through, then founded or led a company.

Chandler RogersGTM AnalystFounded Relay Health

Mary Institute and St. Louis Country Day School (MICDS) mafia2

Also came through, then founded or led a company.

Ryan MaherFounded BizzyCar

Same school

Also attended Cornell University1,007

Doug LeonePartner at Sequoia Capital; former Global Managing PartnerJenny LeeSenior Managing Partner at Granite AsiaNeeraj AgrawalGeneral Partner at Battery VenturesJohn ZimmerCo-founder of LyftMichelle FernandesInvestor at Index VenturesMike ZakInvestor at CRV (Charles River Ventures)

+ 1,001 more

Also attended Mary Institute and St. Louis Country Day School (MICDS)7

Daniel KennedyPartner at Akkadian VenturesArjun DundooInvestor at FirstMarkThomas MilitelloPrincipal at World Innovation LabMichael BrodskyPresident at Era VenturesJT WilliamsonAssociate at ElmTree FundsMax GoldenbergAssociate at RFE Investment Partners

+ 1 more

Shared employers

Also worked at MouseCat (YC W26)1

Nicholas AldridgeCo-Founder & CEO at MouseCat

Also worked at Coinbase169

Balaji SrinivasanAngel investor and founder of The Network SchoolFred EhrsamCo-founder and Senior Advisor at Paradigm; founder of NudgeBrian ArmstrongCo-founder & CEO of CoinbaseKatrina PagliaChief Legal Officer at Pantera CapitalSimon CantInvestor at Reinventure GroupDanny GilliganInvestor at Reinventure Group

+ 163 more

Also worked at Microsoft1,496

Reid HoffmanCo-founder of LinkedIn; Partner at GreylockGarry TanPresident & CEO of Y CombinatorNat FriedmanCo-lead of Meta Superintelligence Labs; co-founder of NFDGKai-Fu LeeChairman of Sinovation Ventures and CEO of 01.AIBill GatesCo-founder of Microsoft; Chair of the Gates FoundationMike KriegerCo-founder of Instagram; Chief Product Officer at Anthropic

+ 1,490 more

Also worked at Handled1

Chandler RogersFounder at Relay Health