William Barthell

William Barthell: Email & Phone Number

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Co-Founder & CTO at Janet AI (YC S25)|San Francisco, California, United States

Position:

Co-Founder & CTO at Janet AI (YC S25)

Location:

San Francisco, California, United States

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Last updated: 2025-11-14
Updated: 2025-11-14

Found email addresses for William Barthell:

Business emails:
Personal emails:
b***@yahoo.com,
w***@aol.com,
w***@gmail.com

Found phones for William Barthell:

+1-909-***-**11,
+1-205-***-**31
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Work Experience 2 years

Co-Founder & CTO at Janet AI (YC S25)

May 2025 - Current

Founding Engineer at Stealth Startup

Mar 2024 - Sep 2024

William Barthell started working in 2024, then the employee has changed 1 company and 1 job. On average, William Barthell works for one company for 9 months.

Education

S25 at Y Combinator

Bachelor's degree at University of Wisconsin-Madison

Saratoga High School

Frequently Asked Questions

What is William Barthell's email address?

SignalHire found verified email addresses for William Barthell, both business and personal. Their business email is w***@hotmail.com, and personal emails include w***@hotmail.com, b***@yahoo.com, and w***@aol.com.

What is William Barthell's phone number?

SignalHire found multiple verified phone numbers for William Barthell: +1-909-***-**65, +1-909-***-**11, and +1-205-***-**31.

How do I contact William Barthell at Janet AI (YC S25)?

You can reach William Barthell 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 William Barthell's professional background?

William Barthell has 2 years of professional experience. They have held roles including Founding Engineer at companies such as Stealth Startup. Their education includes S25 from Y Combinator, and Bachelor's degree from University of Wisconsin-Madison.

Is William Barthell's contact information up to date?

Yes. William Barthell's SignalHire profile was last updated on 14 November 2025, reflecting their current position as Co-Founder & CTO at Janet AI (YC S25).

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