SAML2 API Integration Expert Needed - node js

I'm looking for a professional to integrate the SPID API into my partially existing system (node js). The primary goal of this integration is user authentication.

Key Requirements:
- Prior experience with SAML2 protocols is a must.
- Proven track record in handling x509 certificates is essential.
- Familiarity with the SPID API is highly preferred.

Current System Features:
- The system already has a user interface for login in place.
- The other components of the system are still under development.

Ideal Skills:
- API setup and integration.
- User authentication systems.
- x509 certificate management.
- SAML2 protocol expertise.
- SPID API knowledge.