Authentic Stamping for California Contracts

I'm seeking a professional with the authority to authenticate STRUCTURAL ENGINEERING DOCUMENT, specifically contracts, in the State of California. This individual must have a valid stamp and license, and they must be the stakeholder of the stamping.

Ideal Skills and Experience:
- Legal expertise in contract law
- Authenticating and stamping authority
- Stakeholder of the stamping and license
- Based in or able to authenticate in California
- Trustworthy and able to handle sensitive legal documents