About
David Day founded Skiesoft, an AI transcription company based in Taiwan, and previously worked as a data scientist at UCSF developing models for medical coding validation.
Founder at LunaBillYC F25
Intro paths
YC
David 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 Aaron Epstein, General Partner at Y Combinator — the partner who ran LunaBill's batch and knows the company first-hand. YC profile ↗
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In turn, David can intro founders to LunaBill's investors below.
LunaBill's investors · 5
Co-founders at LunaBill
SP
Suhail ParryFounder
Experience
- LunaBill (YC F25)Co-Foundercurrent2025 — presentSan Francisco, California, United States
- Healthcare Financial Management Association (HFMA)Membercurrent2025 — presentCalifornia, United States
- Founders, Inc.Fellowcurrent2024 — presentSan Francisco, California, United States
- University of California, San FranciscoData Scientist2023 — 2024San Francisco, California, United States
- Google Developer Student ClubsFounder2023 — 2024San Francisco, California, United States
- Skiesoft Corporation LimitedFounder2021 — 2023Taipei City, Taiwan
Skills & more
React Native1MATLAB1Health InformaticsTinyMLReal-time MonitoringSignal ProcessingEmbedded SystemsComputer VisionRoboticsPHPTypeScriptNode.js
+12 more
Python (Programming Language)Natural Language Processing (NLP)Machine LearningStatisticsR (Programming Language)Deep LearningData VisualizationArtificial Intelligence (AI)SoftwareSoftware ArchitectureWeb DevelopmentData Science- CITI Good Clinical Practice Course — CITI Program
- Social and Behavioral Responsible Conduct of Research Course — CITI Program
- Human Subjects Protection Training — CITI Program
- Biomedical Responsible Conduct of Research Course 1. — CITI Program
From David's professional profile.
Frequently asked questions
- Who is David Day?
- David Day founded Skiesoft, an AI transcription company based in Taiwan, and previously worked as a data scientist at UCSF developing models for medical coding validation.
- Where does David Day work?
- David Day is Founder of LunaBill.
- What companies did David Day found?
- David Day founded LunaBill.
- Where did David Day go to school?
- David Day studied at Y Combinator; University of California, San Francisco (Master of Science - MS, Health Data Science); National Central University (Bachelor of Science - BS, Computer Science).
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
University of California, San Francisco mafia28
Also came through, then founded or led a company.
Geoffrey von MaltzahnMSFounded Sienna Biopharmaceuticals +5Dino Di CarloPh.D.Founded Partillion +2Luke EvninPhDFounded Mpmcapital +1Alec NielsenBiophysicsFounded Asimov +1William GreeneMDFounded Pear Therapeutics +1Reinhard MeierPostdoctoral Research FellowshipFounded TeleClinic +1
+ 21 more
Founders mafia19
Also came through, then founded or led a company.
Huzaifa AhmadStudio Software EngineerFounded Parameter +1Furqan RydhanFounderFounded ThirdwebCG ChenFounder in ResidenceFounded Ruta HealthOscar RojasStudio FounderFounded NaraIan LaffeyStudio EngineerFounded TheseusSky YangFounder @Founded Imagine AI
+ 12 more
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 California, San Francisco67
Douglas CrawfordManaging General Partner at Mission BiocapitalLuke EvninAdvisor at MPM BioImpactCharles White, Ph.D.Principal at Illumina VenturesMatt MaurerInvestor at WVV CapitalAlec NielsenFounder & CEO, Asimov & Venture Partner at Pillar VCYvanka de SoysaAssociate at Foreground Capital
+ 61 more
Also attended National Central University7
Kris PengPresident at UMC CapitalAlex ShenAdvisor at UMC CapitalJonas MalmInvestment Associate at node.vcHoward ChenRecruiting Master at AppWorks VenturesBerlin ChenSenior Manager, Ecosystem at Gobi PartnersKen HuangProgram Director at Mosaic Venture Lab
+ 1 more
Shared employers
Also worked at LunaBill (YC F25)1
Also worked at University of California, San Francisco84
Logan HilleLife Sciences Analyst at CincyTechPaul JennyBoard Chair at CincyTechDavid KaufmanInvestor at Third Rock VenturesFrancisco GimenezInvestment Team at 8VCHani GoodarziFounder, Tahoe Therapeutics at Amplify PartnersCharles White, Ph.D.Principal at Illumina Ventures
+ 78 more