Find your path to Jae
389 people in our graph share verified history with Jae — schools, employers, funds. One of them is your warm intro.
Laura BuhlerunlockedJae: together at Stripe (2025)
Jae: together at Flexport
×9Jae: together at Stripe
Jae: together at IBM
About
Jae Choi is a co-founder at Sponge and previously worked on crypto initiatives at Stripe.
Founder at SpongeYC W26
Intro paths
YC
Jae 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 Brad Flora, Backing expeditions into the future — the partner who ran Sponge's batch and knows the company first-hand. YC profile ↗
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In turn, Jae can intro founders to Sponge's investors below.
Sponge's investors · 2
Co-founders at Sponge
EZ
Eric ZhangFounder
RL
Rishab LuthraFounder
Experience
- Sponge (YC W26)Co-Foundercurrent2026 — presentSan Francisco Bay Area
- StripeSoftware Engineer2019 — 2025New York, United States
- StripeSoftware Engineer2019San Francisco Bay Area
- FlexportSoftware Engineer2019San Francisco Bay Area
- Sumo LogicSoftware Engineer2018San Francisco Bay Area
- IBMSoftware Engineer2017Greater Toronto Area, Canada
- BlackBerrySoftware Engineer2016Waterloo, Canada
- IrdetoSoftware Engineer2016Ottawa, Canada
- Imagine CommunicationsSoftware Engineer2015Waterloo, Canada
Frequently asked questions
- Who is Jae Choi?
- Jae Choi is a co-founder at Sponge and previously worked on crypto initiatives at Stripe.
- Where does Jae Choi work?
- Jae Choi is Founder of Sponge.
- What companies did Jae Choi found?
- Jae Choi founded Sponge.
- Where did Jae Choi go to school?
- Jae Choi studied at University of Waterloo (Bachelor of Computer Science).
Founder mafias
Y Combinator mafia10,230
Also came through, then founded or led a company.
Sam AltmanPresidentFounded Tools for Humanity +3Garry TanPresident & CEOFounded Y Combinator +1Jessica LivingstonCo-founderFounded Y CombinatorAlexis OhanianPartnerFounded RedditFred EhrsamYC Summer 2012Founded Nudge +1Matt HuangYC Winter 2011Founded Paradigm +1
+ 10,223 more
University of Waterloo mafia346
Also came through, then founded or led a company.
Chamath PalihapitiyaB.A.Sc.Founded 8090Apoorva MehtaBAScFounded InstacartJon LernerBachelor of Applied ScienceFounded Textnow +2Michael LittBASc. Honours Systems Design EngineeringFounded Garage Capital +1Mike McCauleyBAScFounded Garage Capital +1Zach WaterfieldComputer EngineeringFounded Zettlor +1
+ 339 more
Stripe mafia152
Also came through, then founded or led a company.
Hemant TanejaInvestor (former Board Member)Founded Hippocratic AIMatt HuangBoard MemberFounded Paradigm +1Patrick CollisonCo-founder & CEOFounded AuctomaticGreg BrockmanFounding Engineer, then first CTOFounded OpenAIDaniela AmodeiEarly employee — Risk ManagerFounded AnthropicArvid LunnemarkSoftware EngineeringFounded Cursor
+ 145 more
Flexport mafia32
Also came through, then founded or led a company.
Ryan PetersenCEOFounded FlexportGeorge StrompolosAdvisorFounded Fullscreen +1David PetersenCo-FounderFounded BuildZoom +1Ned CartmellOperations ExcellenceFounded Docunlock +1Rob Schoder, Jr.General Manager, MidwestFounded Vinyl EquityHong HuSenior Engineering Manager & Site LeaderFounded 500Friends
+ 25 more
Flexport mafia31
Also came through, then founded or led a company.
George StrompolosInvestor and AdvisorFounded Fullscreen +1Trae StephensDirectorFounded Pursuit +1Rob Schoder, Jr.Director of Account Management & Operations, MidwestFounded Vinyl EquityDavid PetersenCo-FounderFounded BuildZoomHong HuSenior Engineering Manager & Site LeaderFounded 500FriendsAndrew CoyleProduct Design Lead (first designer)Founded Hey Healthcare
+ 24 more
Same school
Also attended University of Waterloo646
Chamath PalihapitiyaFounder & CEO of Social CapitalApoorva MehtaFounder of Instacart; founder of Cloud Health SystemsAchintya ChaudhariInvestor at LightbankKarim GillaniGeneral Partner at Luge CapitalRohan MongaInvestment Associate at Luge CapitalAndrew MiklasGeneral Partner at Y Combinator
+ 640 more
Shared employers
Also worked at Sponge (YC W26)2
Also worked at Stripe247
Hemant TanejaCEO & Managing Director of General CatalystMatt HuangCo-founder and Managing Partner at ParadigmLuciana LixandruPartner at Sequoia CapitalPatrick CollisonCo-founder & CEO of StripeJohn CollisonCo-founder & President of StripeGreg BrockmanCo-founder & President of OpenAI
+ 241 more
Also worked at Flexport58
Ryan PetersenFounder & CEO of FlexportWesley ChanInvestor at Felicis VenturesJessExecutive Assistant at Renegade PartnersRahul MehtaCo-founder at DST GlobalMatt MocharyInvestor at Fortius VenturesBrian FrankPartner at Permanent Capital Ventures
+ 52 more
Also worked at Sumo Logic42
Chiraag DeoraPrincipal at GreycroftSahir AzamInvestor at Index VenturesAhmed Al-BaharEntrepreneur in Residence at Storm VenturesZack IsaacsonVenture Partner at Rackhouse Venture Management LpKat CreamerOperations Manager at Red Cell IncubationRandy GleinFounder and Managing Partner at DFJ
+ 36 more