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We need an experienced full-stack developer to urgently fix a broken client portal integration on Vercel using Memberstack for authentication, Airtable for CRM sync, and BoldSign for document workflows. This is a high-priority, mission-critical project that requires someone who can start immediately and resolve all issues within hours. The portal is hosted on Vercel on a subdomain for the frontend site. The core problems include: Authentication popups not closing after Memberstack login/signup Failed Airtable sync on new signups Improper approval workflow for new users Console errors related to inline scripts and CSP violations We have the base HTML/CSS/JS built but are experiencing critical integration issues between all moving parts. We also need the system to ensure that only pre-approved emails can gain dashboard access after signing up. Skills Required Proficiency with Memberstack (v1 DOM API) Strong knowledge of Content Security Policy (CSP) setup for Vercel/Next.js environments Experience with Airtable API integration (auth + record creation) Hands-on use of tools like BoldSign API Understanding of web security, cookies, CORS, and redirects Ability to debug complex async flows involving modals, auth state, and data sync