Next.js App Deployment on Vercel

I need an experienced independent developer to deploy an existing Next.js web app on Vercel and resolve a critical AWS credential issue affecting database access. The app is feature-complete for a soft launch and has already passed security and accessibility audits. The work includes diagnosing the credential problem, verifying key production flows, resolving any deployment blockers, and documenting the final setup without rewriting or redesigning the existing application.