Where does Christ Xu work?

Christ Xu is Founder of Rational.

Where did Christ Xu go to school?

Christ Xu studied at Y Combinator; University of Michigan (Bachelor of Science - BS, Honors Mathematics); University of Michigan (Masters of Science, Applied Statistics).

Christ Xu

Founder

Founder at Rational

United States

FoundedRational · YC

Find your path to Christ

348 people in our graph share verified history with Christ — schools, employers, funds. One of them is your warm intro.

Paul BrownunlockedChrist: together at University of Michigan (2025–2026)

×7Christ: together at OpenAI

×4Christ: together at Tencent

About

Christ Xu is a CTO at Rational who previously served as a Senior Software Engineer at Tencent and held roles as an ML Engineer at Jane Street and Software Engineer intern at OpenAI. He has a background in competitive mathematics and algorithm research.

Founder at Rational YC S26

Intro paths

Christ went through Y Combinator (Summer 2026) — any YC alum in your network can reach them through the YC community.

Their group partner at YC was Jared Friedman, YC Group Partner — the partner who ran Rational's batch and knows the company first-hand. YC profile ↗

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In turn, Christ can intro founders to Rational's investors below.

Rational's investors · 2

Vela PartnersSan Francisco · $100K – $500K checks Y CombinatorSan Francisco · $500K checks · since 2026

Co-founders at Rational

Jibril MoinuddinFounder

Experience

RationalCo-Foundercurrent2026 — present
OpenAISoftware Engineering Interncurrent2026 — presentSan Francisco Bay Area
TencentSoftware Engineer2026
TencentSoftware Engineer2026
Jane StreetIN:FOCUS 20262026New York, United States
University of MichiganResearch Assistant2025

Skills & more

MATLAB1Python (Programming Language)1C#1PHPMySQL1JS1Adobe Acrobat1IT-Betrieb1Amazon Web Services (AWS)2DaVinci Resolve1Adobe Photoshop1Microsoft Office1

Languages Chinese · English · German

Introduction to Bio-Inspired Robotics — University of Cambridge

From Christ's professional profile.

Frequently asked questions

Who is Christ Xu?: Christ Xu is a CTO at Rational who previously served as a Senior Software Engineer at Tencent and held roles as an ML Engineer at Jane Street and Software Engineer intern at OpenAI. He has a background in competitive mathematics and algorithm research.
Where does Christ Xu work?: Christ Xu is Founder of Rational.
What companies did Christ Xu found?: Christ Xu founded Rational.
Where did Christ Xu go to school?: Christ Xu studied at Y Combinator; University of Michigan (Bachelor of Science - BS, Honors Mathematics); University of Michigan (Masters of Science, Applied Statistics).

Founder mafias

Y Combinator mafia10,230

Also came through, then founded or led a company.

Sam AltmanPresidentFounded Tools for Humanity +3 Garry TanPresident & CEOFounded Y Combinator +1 Jessica LivingstonCo-founderFounded Y Combinator Alexis OhanianPartnerFounded Reddit Fred EhrsamYC Summer 2012Founded Nudge +1 Matt HuangYC Winter 2011Founded Paradigm +1

+ 10,223 more

University of Michigan mafia339

Also came through, then founded or led a company.

Erik TorenbergBachelor of Arts (B.A.)Founded Villageglobal David R. WaltBachelor of Science - BSFounded Sherlock Biosciences +4 Eric LefkofskyFounded InnerWorkings +2 Chris VoigtBSEFounded Asimov +2 Val AgostinoB.S.E.Founded Monarch +2 Dillon ErbMaster of Architecture (M.Arch.)Founded Paperspace +2

+ 332 more

OpenAI mafia103

Also came through, then founded or led a company.

Reid HoffmanBoard MemberFounded LinkedIn +2 Sam AltmanCo-founder & CEOFounded Tools for Humanity +2 Elon MuskCo-founder & former Co-chair / board memberFounded PayPal +5 Ilya SutskeverCo-founder & Chief ScientistFounded Safe Superintelligence Aravind SrinivasResearch ScientistFounded Perplexity Dario AmodeiVP of ResearchFounded Anthropic

+ 96 more

Humboldt-Universität zu Berlin mafia25

Also came through, then founded or led a company.

Matti NiebelschuetzDiplomFounded Rocket Internet +1 Frederik MerzBachelor of ScienceFounded Ampere +1 Christian BeedgenAssociate’s DegreeFounded Perpetualsystems +1 Daniel HöpfnerBusiness Administration / EconomicsFounded pressmatrix Fritz SeidelBetriebswirtschaftFounded Boomerang Ideas Marcus FosterSociology and AnthropologyFounded Klarismo

+ 18 more

Tencent mafia17

Also came through, then founded or led a company.

Ziarekenya SmithVisual DesignerFounded Techstars +1 Leo LuProduct ManagerFounded Brewit Muzzammil (MZ) ZaveriProduct + StrategyFounded Proxino Chao LuoTencent InvestmentFounded Laiye Chenny (Qianyi) DengMachine Learning InternFounded Piggy Robotics Han XiaoDirector of EngineeringFounded Jina

+ 10 more

Same school

Also attended Y Combinator2,000

Tarek MansourCo-founder & CEO of Kalshi Suhail DoshiFounder of Mixpanel; founder of Particle Subomi OluwalanaCo-founder & CEO of Convoy Arhaan A.Deeptech Fellow at Clear Ventures Collin WallaceGeneral Partner at Lobby Capital Victor SantosVictor Scout at One Way Ventures

+ 1,994 more

Also attended University of Michigan1,046

Erik TorenbergGeneral Partner at Andreessen Horowitz; founder of Turpentine Glen AndersonPartner at Monta Vista Capital Alexandra FarmerPrincipal at Intel Capital, North America Scott ShawChief of Staff at Intel Capital Zach PoleyPartner and Chief Technology Officer at Clear Ventures Tom DanilekPartner, Rise of the Rest Real Estate at Revolution

+ 1,040 more

Also attended BBIS Berlin Brandenburg International School GmbH1

Orkhan AbdullayevFounder at Payrails

Also attended Humboldt-Universität zu Berlin99

Theresa TongOperations Manager at Fusion EvaLegal at NAP Susanna SzwajaWorkplace Managerin & Event Support at Redstone Jana GranigSenior Finance Manager at FoodLabs Isabelle ThierfelderSenior Investment Manager at Seed+Speed Nelly KarschAssociate at Seed+Speed

+ 93 more

Shared employers

Also worked at Rational3

Jim WalshAdvisor at Stage 1 Ventures Jibril MoinuddinFounder at Rational Darrel RaderVice President of Engineering Services at Clear Object

Also worked at OpenAI191

Reid HoffmanCo-founder of LinkedIn; Partner at Greylock Pat GradyPartner at Sequoia Capital Greg BrockmanCo-founder & President of OpenAI Ilya SutskeverCo-founder of OpenAI; co-founder & CEO of Safe Superintelligence Aravind SrinivasCo-founder & CEO of Perplexity AI Dario AmodeiCo-founder & CEO of Anthropic

+ 185 more

Also worked at Tencent58

Leo LuInvestor at Foundation Capital Michael CheungInvestment at Makers Fund Cami KatzInvestor at Notable Capital Yong LimDirector / CRIT Ventures USA at Crit Ventures Muzzammil (MZ) ZaveriPartner at Audacious Ventures backing ambitious early-stage founders Kate WangAssociate at FinTech Collective

+ 52 more

Also worked at Jane Street60

Guillaume LampleCo-founder & Chief Scientist of Mistral AI Arvid LunnemarkFounder of Integrous Research; co-founder of Cursor Olaoluwa OguneyeInvestor at Dorm Room Leigh Marie BraswellPartner at KPCB Sophia LuoPartner at Greylock Partners Chang XuPartner at Basis Set Ventures

+ 54 more

Find your path to Christ

About

Founder at RationalYC S26

Intro paths

Rational's investors · 2

Co-founders at Rational

Experience

Skills & more

Frequently asked questions

Founder mafias

Y Combinator mafia10,230

University of Michigan mafia339

OpenAI mafia103

Humboldt-Universität zu Berlin mafia25

Tencent mafia17

Same school

Also attended Y Combinator2,000

Also attended University of Michigan1,046

Also attended BBIS Berlin Brandenburg International School GmbH1

Also attended Humboldt-Universität zu Berlin99

Shared employers

Also worked at Rational3

Also worked at OpenAI191

Also worked at Tencent58

Also worked at Jane Street60

Founder at Rational YC S26