Fundraising Fox

David Winer

Founder

Founder at Ciro

San Francisco, California, United States

FoundedCiro · YC

About

David Winer is Chief Technology Officer at Ciro. He previously served as a product manager for Kotlin at Google, held engineering and product roles at multiple startups, and worked as a management consultant at Bain & Company. He holds a bachelor's degree in Applied Mathematics from Brown University, a master's degree in Electrical Engineering and Computer Science from UC Berkeley, and an MBA from Stanford University.

LinkedIn ↗X / Twitter ↗
Latest on 𝕏

David Winer @davidjwiner

it's crazy how Zelle auto-enrolled everyone with a US bank account and still no one uses it when was the last time someone asked you to Zelle them for dinner, concert tickets, etc.

Aug 2, 2026 · ♥ 3

David Winer @davidjwiner

personal software is pretty sweet our group chat was trying to coordinate which artists to see at Outside Lands my enterprising friend @sjfinegold vibe coded an app so each person in the chat could vote on their preferred artists for each time slot https://t.co/OjU1sVmDCw

Aug 2, 2026 · ♥ 7

David Winer @davidjwiner

calling it now Kimi will be a top five baby girl name for 2026

Jul 23, 2026 · ♥ 2

Founder at CiroYC S22

Intro paths

YC

David went through Y Combinator (Summer 2022) — any YC alum in your network can reach them through the YC community.

GP

Their group partner at YC was Brad Flora, General Partner at Y Combinator — the partner who ran Ciro's batch and knows the company first-hand. YC profile ↗

→

In turn, David can intro founders to Ciro's investors below.

Ciro's investors · 2

CRV (Charles River Ventures)Y Combinator

Co-founders at Ciro

RGRoss Geiger
Ross GeigerFounder
RLRichard Lee
Richard LeeFounder

Experience

  1. CiroCo-Founder and CTOcurrent2022 — presentSan Francisco Bay Area
  2. GoogleKotlin Product Manager2019 — 2022San Francisco Bay Area
  3. WageCo-Founder and CTO2017 — 2019
  4. Pure StorageData Scientist2017Mountain View, CA
  5. Bain & CompanySenior Associate Consultant2013 — 2016Boston, MA

Education

  1. Y Combinator2022
  2. Stanford UniversityMaster's Degree2017 — 2019
  3. University of California, BerkeleyMaster’s Degree, Electrical Engineering and Computer Science2016 — 2017
  4. Brown UniversityBachelor’s Degree, Applied Mathematics2009 — 2013

Skills & more

Python9Matlab6Java1Microsoft Excel1JavaScript1HTMLRuby on RailsCSSDatabasesMicrosoft OfficeKotlinMachine Learning6
+12 moreTeachingResearchCoffeeScriptMergers & AcquisitionsGo-to-market StrategyAgile Web DevelopmentNonprofit ConsultingAnalyticsConsultingComputer ScienceUser ExperienceAndroid Development

Languages English · Spanish

From David's professional profile.

Same school

Also attended Y Combinator1,463

Akshat GoenkaInvestor at Moonfire VenturesJon XuGeneral Partner at Y CombinatorTed ChaiAssociate at Scale Venture PartnersLeo LuInvestor at Foundation CapitalMaroof AhmedFounder at Octopus VenturesYusuf SherwaniCo-Founder and CEO at Pelago; a Londoner living in New York City

+ 1,457 more

Also attended Stanford University1,726

Peter ThielCo-founder & Partner at Founders FundReid HoffmanCo-founder of LinkedIn; Partner at GreylockDavid SacksCo-founder & General Partner at Craft Ventures; former White House AI & Crypto CzarKeith RaboisManaging Director at Khosla VenturesGarry TanPresident & CEO of Y CombinatorAlfred LinPartner at Sequoia Capital

+ 1,720 more

Also attended University of California, Berkeley987

Byron DeeterPartner at Bessemer Venture PartnersTrevor OelschigInvestment Team at General CatalystBrendan Bulik-SullivanInvestor at GV (Google Ventures)Glen AndersonPartner at Monta Vista CapitalAnthony LinHead of Intel Capital, Corporate Vice President at Intel CapitalScott ShawChief of Staff at Intel Capital

+ 981 more

Also attended Brown University327

Theresia GouwFounding Partner at Acrew CapitalAlexis AbramsPartner, General Counsel at Felicis VenturesJohn KimInvestor Relations at General CatalystAli Fisher SweetInvestor at Index VenturesMark GoldbergInvestor at Index VenturesKarim FarisInvestor at GV (Google Ventures)

+ 321 more

Shared employers

Also worked at Ciro3

Anna KhanGeneral Partner at CRV (Charles River Ventures)Ross GeigerFounder at CiroRichard LeeFounder at Ciro

Also worked at Google1,078

Ron ConwayFounder of SV AngelBrian SingermanCo-founder of GPx; Partner Emeritus at Founders FundJess LeePartner and Chief Product Officer at Sequoia CapitalTomasz TunguzFounder & General Partner at Theory VenturesHunter WalkCo-founder & Partner at HomebrewAydin SenkutFounder & Managing Partner at Felicis

+ 1,072 more

Also worked at Pure Storage16

Mike SpeiserManaging Director at Sutter Hill VenturesMike VolpiInvestor at Index VenturesCameron BaharVenture Partner at Think+ Ventures Management, LlcJoe PintoChief Customer Experience Officer, Pure Storage at Two Bear CapitalMallun YenFounder & Managing Partner at Operator CollectiveJay ChongManaging Partner at Millennium New Horizons

+ 10 more

Also worked at Bain & Company619

Steve JurvetsonCo-founder of Future VenturesLaela SturdyManaging Partner at CapitalGTheresia GouwFounding Partner at Acrew CapitalJulie YangVice President at InvestcorpZach PoleyPartner and Chief Technology Officer at Clear VenturesIan MarshInvestor at DN Capital

+ 613 more