About
Toni Lopez previously worked at IBM Research and founded Stack AI (part of Y Combinator's Winter 2023 cohort). He is currently building Karumi.
Founder at KarumiYC F25
Intro paths
YC
Toni went through Y Combinator (Fall 2025) — any YC alum in your network can reach them through the YC community.
GP
Their group partner at YC was Nicolas Dessaigne, General Partner at Y Combinator — the partner who ran Karumi's batch and knows the company first-hand. YC profile ↗
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In turn, Toni can intro founders to Karumi's investors below.
Karumi's investors · 2
Co-founders at Karumi
PO
Pablo OmenacaFounder
Experience
- Karumi (YC F25)Co-Foundercurrent2025 — presentSan Francisco, California, United States
- StackAIFounding Engineer2024 — 2025San Francisco y alrededores
- Cactus AICo-Founder2023 — 2024San Francisco Bay Area
- Seaplane IOFounding Dev Experience Engineer2021 — 2023Mountain View, California, United States
- Sparta CommoditiesFounding Engineer - Technical Lead2020 — 2021Geneva, Switzerland
- IBMSenior Applied AI Engineer2018 — 2020Nueva York, Estados Unidos
- PleasoundFounding Engineer2016 — 2018London, United Kingdom
- COME - Reinventing your mealsCTO and Co-founder2014 — 2016Valencia, Spain
- MeetizerAndroid Software Engineer2013 — 2014Valencia, España
- DIGIO Soluciones DigitalesJunior Sofware Developer2012 — 2013
Skills & more
AI5Functional Programming6Data Scraping2Data Engineering1Open-Source Development1Architectural Design1User Acceptance Testing1SDK development1Android Development14SOLID Principles4Refactoring3Unit Testing2
+12 more
Dependency InjectionContinuous IntegrationElectronicsBack-End Web DevelopmentWeb DevelopmentEngineering ManagementTeam LeadershipRust (Programming Language)iOSAndroidSpring BootReact.jsLanguages Español · Ingles
- DAY[EMPRENDE] — Universitat Politècnica de València (UPV)
- Student tutor program certification — Universitat Politècnica de València (UPV)
From Toni's professional profile.
Frequently asked questions
- Who is Toni Lopez?
- Toni Lopez previously worked at IBM Research and founded Stack AI (part of Y Combinator's Winter 2023 cohort). He is currently building Karumi.
- Where does Toni Lopez work?
- Toni Lopez is Founder of Karumi.
- What companies did Toni Lopez found?
- Toni Lopez founded Karumi.
- Where did Toni Lopez go to school?
- Toni Lopez studied at Universitat Politècnica de València (UPV) (Computer Science); IES Ginés Pérez Chirinos (Senior technician Multiplatform Application Development, Software 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
Universitat Politècnica de València (UPV) mafia6
Also came through, then founded or led a company.
StackAI mafia5
Also came through, then founded or led a company.
Same school
Also attended Universitat Politècnica de València (UPV)23
Daniela CoutinhoPrincipal, Cyber at Bright Pixel CapitalEnrique PenichetFounding Partner at Draper B1Raquel BernalManaging Partner Investment Director at Draper B1Cecilia UllmannBack office at Draper B1Maximilian StadlerJunior Finance Manager at BONVENTUREHenric SuuronenFounding Partner at Play Ventures
+ 17 more
Shared employers
Also worked at Karumi (YC F25)1
Also worked at IBM710
Brian ArmstrongCo-founder & CEO of CoinbaseOlivier PomelCo-founder & CEO of DatadogAlexis Le-QuocCo-founder & CTO of DatadogKen ChenaultInvestment Team at General CatalystRoger KrakoffGeneral Partner at Monta Vista CapitalAvi BharadwajInvestment Director at Intel Capital
+ 704 more