Where does Regina Lin work?

Regina Lin is Founder/CEO of Thirdlayer.

Where did Regina Lin go to school?

Regina Lin studied at Y Combinator (W25); Harvard University (BA, Mathematics & Concurrent Master's in CSE); Massachusetts Institute of Technology (Cross-Registered (3 courses)).

Regina Lin

Founder

Founder/CEO at Thirdlayer

San Francisco, California, United States

FoundedThirdlayer · YC

Find your path to Regina

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

HemamunlockedRegina: together at Stealth Startup (2023–2024)

×6Regina: together at Stealth Startup

×5Regina: together at Harvard University

About

Regina Lin is CEO and co-founder of Dex. She studied mathematics and computational science at Harvard, and previously co-founded Contour AI, an LLM evaluation devOps platform, while also contributing to e-commerce marketplace development and working in technology investment roles.

Founder/CEO at Thirdlayer YC W25

Intro paths

Regina went through Y Combinator (Winter 2025) — any YC alum in your network can reach them through the YC community.

→

In turn, Regina can intro founders to Thirdlayer's investors below.

Thirdlayer's investors · 5

A16Z SpeedrunSan Francisco · $1M checks · since 2026 Concept VenturesLondon · $1.5M checks · since 2026 Notion CapitalLondon · $1M – $100M checks · since 2026 Theory VenturesSan Francisco · $1M – $40M checks Y CombinatorSan Francisco · $500K checks · since 2025

Co-founders at Thirdlayer

Kevin GuFounder

Experience

ThirdLayer (YC W25)Co-Founder, CEOcurrent2025 — present
various financial firmstech investing2023 — 2024
Stealth Startupcofounder2023 — 2024
Harvard UniversityMath 152 (discrete mathematics)2022 — 2024Cambridge, Massachusetts, United States
BazarProduct2022 — 2023
Epoch Performing ArtsFounder2017 — 2022

Skills & more

Leveraged Buyouts (LBO)14Data Analysis4Management6

Languages Python · Spanish

From Regina's professional profile.

Frequently asked questions

Who is Regina Lin?: Regina Lin is CEO and co-founder of Dex. She studied mathematics and computational science at Harvard, and previously co-founded Contour AI, an LLM evaluation devOps platform, while also contributing to e-commerce marketplace development and working in technology investment roles.
Where does Regina Lin work?: Regina Lin is Founder/CEO of Thirdlayer.
What companies did Regina Lin found?: Regina Lin founded Thirdlayer.
Where did Regina Lin go to school?: Regina Lin studied at Y Combinator (W25); Harvard University (BA, Mathematics & Concurrent Master's in CSE); Massachusetts Institute of Technology (Cross-Registered (3 courses)).

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

Massachusetts Institute of Technology mafia1,221

Also came through, then founded or led a company.

Elad GilPhDFounded Brain Co. +1 Hemant TanejaMinorFounded Hippocratic AI Nat FriedmanBachelor of ScienceFounded Xamarin Brad FeldS.B.Founded Techstars Matt HuangB.S.Founded Paradigm +1 Delian AsparouhovDropoutFounded Nightingale +1

+ 1,214 more

Prod mafia17

Also came through, then founded or led a company.

Robbie KhazanFounded Payvment Devi JhaFounded Cardinal Maggie ZhangCohort 2Founded Read Bean Anna SunCohort 2.0Founded Nowadays Jonas NelleFounded Autotab Anna MonacoCohort 3 ++Founded Paradigm

+ 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 Harvard University2,000

Ron ConwayFounder of SV Angel Alfred LinPartner at Sequoia Capital Chris DixonFounder & Managing Partner of a16z crypto at Andreessen Horowitz Sarah TavelVenture Partner at Benchmark Danny RimerPartner at Index Ventures Laela SturdyManaging Partner at CapitalG

+ 1,994 more

Also attended Massachusetts Institute of Technology2,000

Hemant TanejaCEO & Managing Director of General Catalyst Nat FriedmanCo-lead of Meta Superintelligence Labs; co-founder of NFDG Brad FeldCo-founder of Foundry and Techstars Matt HuangCo-founder and Managing Partner at Paradigm Delian AsparouhovPartner at Founders Fund and co-founder of Varda Drew HoustonCo-founder & CEO of Dropbox

+ 1,994 more

Also attended Prod16

Robbie KhazanInvestor at Tq Ventures Llc Devi JhaFounder at Cardinal Maggie ZhangFounder at Read Bean Anna SunFounder at Nowadays Jonas NelleFounder at Autotab Anna MonacoFounder at Paradigm

+ 10 more

Shared employers

Also worked at ThirdLayer (YC W25)3

Calvin ChinManaging Partner at E14 Fund Kevin GuFounder at Dex Calvin ChinGeneral Partner at E14 Limited Partnership

Also worked at Stealth Startup485

Andrew ChenGeneral Partner at Andreessen Horowitz Gabriel PereyraCo-founder & President of Harvey Erica VanInvestment Director at Intel Capital HemamAdvisor at Clear Ventures Arhaan A.Deeptech Fellow at Clear Ventures Hamish GarnettAssociate at Manta Ray Ventures

+ 479 more

Also worked at Harvard University488

Nathan BlecharczykCo-founder & CSO of Airbnb Ryan SheaCo-founder of Blockstack (Stacks)Rachel HansenInvestor at Index Ventures Dave MunichielloInvestor at GV (Google Ventures)Nicole GaudelliEntrepreneur in Residence at GV (Google Ventures)Logan HilleLife Sciences Analyst at CincyTech

+ 482 more

Find your path to Regina

About

Founder/CEO at ThirdlayerYC W25

Intro paths

Thirdlayer's investors · 5

Co-founders at Thirdlayer

Experience

Skills & more

Frequently asked questions

Founder mafias

Y Combinator mafia10,230

Massachusetts Institute of Technology mafia1,221

Prod mafia17

Same school

Also attended Y Combinator2,000

Also attended Harvard University2,000

Also attended Massachusetts Institute of Technology2,000

Also attended Prod16

Shared employers

Also worked at ThirdLayer (YC W25)3

Also worked at Stealth Startup485

Also worked at Harvard University488

Founder/CEO at Thirdlayer YC W25