Fundraising Fox

Zi Zhang

Founder

Co-Founder & CTO at Proximitty

United States

FoundedProximitty · YC

About

Zi Zhang previously led security infrastructure at Bloomberg and served as Head of Engineering at ACI.dev. He is currently Co-founder and CTO at Proximitty.

Co-Founder & CTO at ProximittyYC W26

Intro paths

YC

Zi 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 Diana Hu, General Partner at Y Combinator — the partner who ran Proximitty's batch and knows the company first-hand. YC profile ↗

→

In turn, Zi can intro founders to Proximitty's investors below.

Proximitty's investors · 3

Cohen CircleNew YorkSterling RoadSan Francisco · $50K – $150K checksY CombinatorSan Francisco · $500K checks · since 2026

Co-founders at Proximitty

WYWye Yew Ho
Wye Yew HoCo-Founder & CEO

Experience

  1. ProximittyCo-Founder and CTOcurrent2025 — presentSan Francisco Bay Area
  2. BloombergPlatform Security Tech Lead2023 — 2025Greater London, England, United Kingdom
  3. BloombergDerivatives2021 — 2023New York, United States
  4. ACI.devHead of Engineering2025Greater London, England, United Kingdom
  5. C.H. RobinsonCapstone Project2020Minnesota, United States
  6. SPS CommerceSoftware Engineer Intern2020Minneapolis, Minnesota, United States
  7. University of MinnesotaStudent Technology Help Specialist2019 — 2020Greater Minneapolis-St. Paul Area
  8. Huazhong University of Science and TechnologyResearch Assistant2018 — 2019Wuhan, Hubei, China

Skills & more

Java25Python (Programming Language)25Go (Programming Language)22iOS Development2Flask2Django3Spring1C++1Amazon Web Services (AWS)2MySQL1Swift2MongoDB2
+1 moreExpress.js
  • Triplebyte Certified Generalist Software Engineer — Triplebyte
  • Concurrency in Go — Coursera
  • AWS Fundamentals: Going Cloud-Native — Coursera

From Zi's professional profile.

Frequently asked questions

Who is Zi Zhang?
Zi Zhang previously led security infrastructure at Bloomberg and served as Head of Engineering at ACI.dev. He is currently Co-founder and CTO at Proximitty.
Where does Zi Zhang work?
Zi Zhang is Co-Founder & CTO of Proximitty.
What companies did Zi Zhang found?
Zi Zhang founded Proximitty.
Where did Zi Zhang go to school?
Zi Zhang studied at Y Combinator (W26); University of Minnesota (Bachelor of Science - BS, Computer Science); National University of Singapore (Summer School, Civil Engineering).

Founder mafias

Y Combinator mafia8,773

Also came through, then founded or led a company.

Sam AltmanPresidentFounded Tools for Humanity +3Jessica LivingstonCo-founderFounded Y CombinatorAlexis OhanianYC Summer 2005Founded RedditFred EhrsamYC Summer 2012Founded Nudge +1Matt HuangYC Winter 2011Founded HotspotsTrae StephensYC Winter 2022Founded Pursuit +1

+ 8,766 more

Y Combinator mafia4,716

Also came through, then founded or led a company.

Ryan SheaEntrepreneurshipFounded StacksTarek MansourFounded KalshiSuhail DoshiEating beans & riceFounded Playground +1Subomi OluwalanaW22Founded ConvoyDarius "Bubs" MonsefS19Founded Sightbox +3Matthew ScholzFounded Oisin Biotechnologies +3

+ 4,709 more

National University of Singapore mafia88

Also came through, then founded or led a company.

Aihui OngB.Sc.Founded Love With Food +2Mike MoradiLeadershipFounded Southwest Nanotechnologies +1Lloyd LeeExchange StudentFounded Hyperithm +1Sivamani VarunBachelor of Engineering - BEFounded Keygraph +1Victor Liew Jia HaoBachelor of Computing (Honours)Founded StraitsX +1Kushal PillayMaster's degreeFounded Powerhouse Ai +1

+ 81 more

University of Minnesota mafia33

Also came through, then founded or led a company.

Richard HeymanPhDFounded Architect Therapeutics +1Ruban KanapathippillaiBSFounded Iterate AI +1Michael HoeyPhD workFounded Uptake Medical +1Leah CulverB.S.Founded Breaker +1Pouyan SalehiBMEFounded Scratchpad +1Max MinskerBachelor’s DegreeFounded Cranston AI +1

+ 26 more

Huazhong University of Science and Technology mafia3

Also came through, then founded or led a company.

Chengjun YuanBachelor’s DegreeFounded SugerJiaxin LinElectrical and Information TechnologyFounded Promi

Same school

Also attended Y Combinator2,000

Tarek MansourCo-founder & CEO of KalshiSuhail DoshiFounder of Mixpanel; founder of ParticleSubomi OluwalanaCo-founder & CEO of ConvoyMaroof AhmedFounder at Octopus VenturesJustin SwartPartner at Bitkraft Esports VenturesCollin WallaceGeneral Partner at Lobby Capital

+ 1,994 more

Also attended University of Minnesota119

Madeline PopeSenior Associate, Platform & Marketing at March Capital PartnersNate LeeFounder and Chief Information Security Officer at Scale Venture PartnersIsaac ZikeManaging Director at RiverVest Venture PartnersRichard HeymanVenture Partner at ARCH Venture PartnersJohn BergstromInvestor at Mairs & Power VCMark GorenbergInvestor at Zetta Venture Partners

+ 113 more

Also attended National University of Singapore332

Justin HallPartner at Golden Gate VenturesMahati SridharPartner, Rise of the Rest at RevolutionCeline XiaoInvestor at DN CapitalSofia DahouneInvestor at DaphniYi Min LohInvestment Associate at Burda Principal InvestmentsSean LooInvestment Analyst at Burda Principal Investments

+ 326 more

Also attended Huazhong University of Science and Technology13

Raymond LiaoManaging Director at Samsung NextXiang GaoFounding Partner at Gaorong CapitalHan LiuMentor at Lair East LabsBo DuManaging Director at WestSummit CapitalSimona XuSenior Research & Strategy Associate at Prosperity7 VenturesJack YangFounder & CEO at LTP (LiquidityTech Protocol)

+ 7 more

Shared employers

Also worked at Proximitty1

Wye Yew HoFounder at Proximitty

Also worked at Bloomberg154

Reed HastingsCo-founder of NetflixEric WagnerVP of Research and Data at Redpoint VenturesVivek GopalanInvestment Team at 8VCAndrea GurnariInvestor at Moonfire VenturesAllison PavlickInvestor Relations Principal at S32Adriana RocheHead of Talent at Uncork Capital

+ 148 more

Also worked at C.H. Robinson4

Theodore AllingManaging Partner at Dynamo VenturesChristian MillerPrincipal at Poplar VenturesMark BrooksInvestor at Syngenta Group VenturesKatherine SizovExecutive Officer, Director at Strella Biotechnology

Also worked at University of Minnesota23

Jessica A. Zeaske, PhD, MBAManaging Partner, Strategic Investment at Echo Health VenturesBrett BrohlManaging Partner at Bread And Butter Ventures, LlcWill MorrisonPrincipal at DFJWilliam Tunstall-PedoeInvestor at Cambridge Innovation CapitalNicholas TanAssociate Director at Aura GroupKatherine M. BryanInvestor at Madison Dearborn Partners

+ 17 more