Where did Justin Ko go to school?

Justin Ko studied at Y Combinator (S21); University of Southern California (Bachelor's Degree).

Justin Ko

Founder

Founder at Opkit

New York City Metropolitan Area

FoundedOpkit · YC

Find your path to Justin

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

Damir BecirovicunlockedJustin: together at University of Southern California (2013)

×11Justin: together at Y Combinator

About

Justin Ko was an early engineer at Brex working on growth, card, and cash products, and previously co-founded SpeakGenius, an English learning application. He studied entrepreneurship at the University of Southern California.

Founder at Opkit YC S21

Intro paths

Justin went through Y Combinator (Summer 2021) — any YC alum in your network can reach them through the YC community.

→

In turn, Justin can intro founders to Opkit's investors below.

Opkit's investors · 4

Global Founders CapitalBerlin · $637K – $32M checks · since 2023 MischiefSan Francisco · $1M – $5M checks · since 2023 Socially FinancedChatham · $100K – $250K checks · since 2023 Y CombinatorSan Francisco · $500K checks · since 2021

Co-founders at Opkit

Sherwood CallawayCo-founder/CEO

Experience

SazabiFounding Engineercurrent2026 — present
11xLead Engineer2024 — 2025
OpkitCo-founder/CTO2021 — 2024
BrexSoftware Engineer2019 — 2021Greater New York City Area
Speak GeniusCo-Founder2017 — 2019Greater Los Angeles Area
SpaceXIntern2015 — 2017Los Angeles Metropolitan Area
AmazonIntern2016

Skills & more

Start-ups12Web Design19Product Management8Research24Data Analysis20Event Planning13Social Media13Marketing12Web Development23Customer Service12Express25WebRTC22

+12 more

LeadershipPublic SpeakingTeamworkJavaScriptNode.jsReact.jsC++SQLAngularJSPowerPointMicrosoft ExcelMicrosoft Office

Languages Korean

From Justin's professional profile.

Frequently asked questions

Who is Justin Ko?: Justin Ko was an early engineer at Brex working on growth, card, and cash products, and previously co-founded SpeakGenius, an English learning application. He studied entrepreneurship at the University of Southern California.
Where does Justin Ko work?: Justin Ko is Founder of Opkit.
What companies did Justin Ko found?: Justin Ko founded Opkit.
Where did Justin Ko go to school?: Justin Ko studied at Y Combinator (S21); University of Southern California (Bachelor's Degree).

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 Southern California mafia349

Also came through, then founded or led a company.

Marc BenioffB.S.B.A.Founded Salesforce Gabriel PereyraBachelor's degreeFounded Harvey Kent WakefordJuris Doctorate (J.D.)Founded Breaking +4 Brian CruverBAFounded Xenex +2 Francisco TolmaskyBachelorsFounded RunKit +2 Erica BresciaBSFounded Bitnami +1

+ 342 more

Brex mafia48

Also came through, then founded or led a company.

Henrique DubugrasCo-CEOFounded Stone Ritik MalhotraDirector, Product ManagementFounded Savvy +2 Tanooj LuthraSenior Engineering Manager, Foundation Platform + ObservabilityFounded Elph +1 Cullen WilsonProduct Design LeadFounded WP Engine +1 Keenan D. WilliamsRelationship ManagerFounded Rezi +1 Asa MillerDesign EngineerFounded Pre +1

+ 41 more

Sazabi mafia5

Also came through, then founded or led a company.

Shri GaneshramSeed InvestorFounded FlightCar Jeff TangAngel InvestorFounded Eat Blueprint Sherwood CallawayFounderFounded Opkit George Hurn-MaloneyInvestorFounded Fastino

11x mafia4

Also came through, then founded or led a company.

Sherwood CallawayTech Lead & Engineering Manager, AliceFounded Sazabi +1 Hemant PhalakProduct Lead, AliceFounded Entvin Prabhav JainChief Executive OfficerFounded EagerPanda

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 Southern California970

Shaun MaguirePartner at Sequoia Capital Marc BenioffCo-founder, Chair & CEO of Salesforce Gabriel PereyraCo-founder & President of Harvey Damir BecirovicInvestor at Index Ventures Vojtech HornaInvestor at Index Ventures Natalie VaisInvestor at Spark Capital

+ 964 more

Shared employers

+ 59 more

Also worked at SpaceX243

Roelof BothaAdvisor & former Steward at Sequoia Capital; SpaceX board member Steve JurvetsonCo-founder of Future Ventures Asanka JayasuriyaPortfolio Support at 8VC Justin RoseInvestment Team at 8VC Garry HillInvestment at Makers Fund Helen LiangFounder & General Partner at FoundersX Ventures

+ 237 more

Find your path to Justin

About

Founder at OpkitYC S21

Intro paths

Opkit's investors · 4

Co-founders at Opkit

Experience

Skills & more

Frequently asked questions

Founder mafias

Y Combinator mafia10,230

University of Southern California mafia349

Brex mafia48

Sazabi mafia5

11x mafia4

Same school

Also attended Y Combinator2,000

Also attended University of Southern California970

Shared employers

Also worked at Sazabi5

Also worked at Opkit1

Also worked at Brex65

Also worked at SpaceX243

Founder at Opkit YC S21