Fullstack Developer: Central DB Setup & Clerk Cross-Domain SSO (Strictly Replit)

We have an ecosystem of live web tools hosted on about 10 subdomains, currently relying on localStorage. We need an experienced Fullstack Developer to build a centralized database on our main dashboard and connect all tools via Clerk Cross-Domain SSO. This includes input/output from DB to satellite tools (subdomains). 🚨 STRICTLY REPLIT: All our infrastructure runs on Replit and will stay there for now. At later stages we might consider migrating to another hosting solution. Do not apply if you intend to suggest migrating to Vercel, AWS, etc. You must be comfortable building and debugging entirely within the Replit ecosystem. Key Responsibilities: Central DB & API: Set up a database (e.g., Replit Postgres) on the main dashboard to store unified user profiles, and build secure REST endpoints. Clerk SSO: Configure subdomains as Clerk "Satellite Applications" for seamless cross-domain sessions and redirects. State Refactoring: Replace existing localStorage logic in the frontend tools with API calls to the new central DB, ensuring Clerk Bearer tokens are passed correctly. Requirements: Strong Fullstack experience (Node.js, React/Next.js/Vue, PostgreSQL). Proven experience with Clerk Auth, specifically multi-domain / satellite setups. Hands-on experience managing and deploying projects directly on Replit. Additional information will be provided to selected freelancers.