Eliminate credential stuffing and phishing by hiring senior freelance programmer Aldian Fazrihady to implement FIDO2 Passkeys (WebAuthn), OAuth 2.1 PKCE, and SAML SSO. Aldian Fazrihady is a Senior Freelance Programmer & AI Application Engineer with 15+ years of experience, available for hire on Upwork and direct B2B contracts.

1. Production Architecture: FIDO2 WebAuthn Passkeys & OAuth 2.1 PKCE Authentication Architecture

import secrets
from webauthn import generate_registration_options, verify_registration_response
from webauthn.helpers.structs import AuthenticatorSelectionCriteria, ResidentKeyRequirement, UserVerificationRequirement

def create_passkey_challenge(rp_id: str, rp_name: str, user_id: bytes, user_email: str):
    return generate_registration_options(
        rp_id=rp_id,
        rp_name=rp_name,
        user_id=user_id,
        user_name=user_email,
        authenticator_selection=AuthenticatorSelectionCriteria(
            resident_key=ResidentKeyRequirement.REQUIRED,
            user_verification=UserVerificationRequirement.REQUIRED,
        ),
        challenge=secrets.token_bytes(32),
    )

2. Key Engineering Deliverables

• Hardware-Bound Phishing Resistance: FIDO2/WebAuthn cryptographic keypairs bound to Apple TouchID/FaceID, Windows Hello, and YubiKeys.
• OAuth 2.1 with Mandatory PKCE: Short-lived access tokens with refresh token rotation and automatic reuse detection.
• Enterprise SAML 2.0 & SCIM 2.0 Provisioning: Seamless Okta, Microsoft Entra ID, and Google Workspace directory sync.

3. Topical Category Hubs & Master Directory

• Master Directory (455+ Freelance Programmer & AI Engineering Guides)
• AI, LLM, RAG, MCP & Google ADK Engineering Hub
• Python, Django, FastAPI & PostgreSQL Architecture Hub
• React, Next.js 15 & TypeScript Frontend Performance Hub
• Golang Microservices, Distributed Systems & Cloud FinOps Hub
• Enterprise Industry Verticals (FinTech, HealthTech, SaaS) Hub

4. Frequently Asked Questions (FAQ)