David Day: Email & Phone Number

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Co-Founder at LunaBill (YC F25)|San Francisco, California, United States

Position:

Co-Founder at LunaBill (YC F25)

Location:

San Francisco, California, United States

View David Day's Email

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Last updated: 2026-07-09

Updated: 2026-07-09

Found email addresses for David Day:

Business emails:

*o*@davidday.tw,

d***d@lunabill.com

Personal emails:

d*******y@ucsf.edu,

d***********0@juno.com

Found phones for David Day:

+1-205-***-**28,

+1-323-***-**04,

+1-520-***-**60,

+1-323-***-**09

A different David Day?

Work Experience 5 years

Co-Founder at LunaBill (YC F25)

Jan 2025 - Current

Member at Healthcare Financial Management Association (HFMA)

Jan 2025 - Current

Fellow at Founders, Inc.

Oct 2024 - Current

Data Scientist at University of California, San Francisco

Oct 2023 - Dec 2024

Founder at Google Developer Student Clubs

Aug 2023 - Jan 2024

Founder at Skiesoft Corporation Limited

Oct 2021 - Jul 2023

David Day started working in 2021, then the employee has changed 5 companies and 4 jobs. On average, David Day works for one company for 1 year 4 months.

Their professional focus is Artificial Intelligence (AI), Computer Science, and Computer Vision across 3 core areas.

David holds Biomedical Responsible Conduct of Research Course 1., CITI Good Clinical Practice Course, and Social and Behavioral Responsible Conduct of Research Course certifications.

Education

Y Combinator

Master of Science - MS at University of California, San Francisco

Bachelor of Science - BS at National Central University

Frequently Asked Questions

What is David Day's email address?

SignalHire found verified email addresses for David Day, both business and personal. Their business email is *o*@davidday.tw, and personal emails include d*******y@ucsf.edu, and d***********0@juno.com.

What is David Day's phone number?

SignalHire found multiple verified phone numbers for David Day: +1-205-***-**28, +1-323-***-**04, and +1-520-***-**60.

How do I contact David Day at LunaBill (YC F25)?

You can reach David Day through SignalHire by unlocking their verified email and direct phone number (free signup, no credit card needed). SignalHire is the fastest route if you need their contact details immediately.

What is David Day's professional background?

David Day has 5 years of professional experience. They have held roles including Member, Fellow, and Data Scientist at companies such as Healthcare Financial Management Association (HFMA), Founders, Inc., and University of California, San Francisco. Their education includes Y Combinator, and Master of Science - MS from University of California, San Francisco.

Is David Day's contact information up to date?

Yes. David Day's SignalHire profile was last updated on 9 July 2026, reflecting their current position as Co-Founder at LunaBill (YC F25).

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