William Barthell: Email & Phone Number

Opt-Out

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

View William Barthell's Email

Up to 10 free lookups. No credit card required.

Last updated: 2025-11-14

Updated: 2025-11-14

Found email addresses for William Barthell:

Business emails:

w***@hotmail.com

Personal emails:

w***@hotmail.com,

b***@yahoo.com,

w***@aol.com,

w***@gmail.com

Found phones for William Barthell:

+1-909-***-**65,

+1-909-***-**11,

+1-205-***-**31

A different William Barthell?

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 10 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).

Similar profiles

Name

Company

Position

Yuan Zhou

Doctor Scrap

Co-Founder & CTO

Get contacts

Brandon LaRue

SipSync

Co-Founder & CTO

Get contacts

Rajeev Kamble

Razonica

Co-Founder & CTO

Get contacts

Artemiy Malyshau

Gecko Security

Co-Founder & CTO

Get contacts

Aman Malviya

ID2(Intelligent Digital Device)

Co-Founder & CTO

Get contacts

Jatin Galdhariya

Task Troopers

Co-Founder & CTO

Get contacts

See more profiles

Data Privacy

GDPR COMPLIANT

SignalHire complies with the General Data Protection Regulation (GDPR). SignalHire follows GDPR requirements, including but not limited to rights of data subjects to access, correct, or delete their personal information and supports the right to be forgotten.

CCPA COMPLIANT

SignalHire is CCPA-compliant and provides California residents the right to know, access, opt out, and request deletion of their personal data.