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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.
CTO at LunaBillYC F25
Intro paths
David went through Y Combinator (Fall 2025) — any YC alum in your network can reach them through the YC community.
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 ↗
In turn, David can intro founders to LunaBill's investors below.
LunaBill's investors · 16
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Co-founders at LunaBill
Investments
Investor
Per curated public sources.
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 CTO of LunaBill.
- What companies did David Day found?
- David Day founded LunaBill.
- What companies has David Day invested in?
- Investments tracked here include Opalite Health, Parse.
Founder mafias
Y Combinator mafia10,594
Also came through, then founded or led a company.
University of California, San Francisco mafia97
Also came through, then founded or led a company.
Founders mafia28
Also came through, then founded or led a company.
National Central University mafia5
Also came through, then founded or led a company.
About this profile. Compiled from public sources — LunaBill's own website and public professional profiles — and summarised by Fundraising Fox; every fact is kept with where it came from. Spotted an error, or would rather not be listed? Email privacy@fundraisingfox.com · How we build profiles · Your rights