Senior Next.js / Supabase Developer for AI SMS Booking SaaS

I’m looking for a strong full-stack TypeScript developer to help stabilize and improve a live AI booking SaaS for tattoo artists. This is not a basic website. It is a multi-tenant SaaS with SMS automation, AI replies, owner approval, deposits, appointment creation, Google Calendar sync, and tenant-specific settings. Stack: * Next.js App Router * TypeScript * Supabase / Postgres * Inngest background workflows * SendBlue SMS/iMessage webhooks * Anthropic Claude API * Google Calendar API * Stripe webhooks * Netlify What I need help with: * Auditing backend workflows * Fixing bugs without breaking tenant isolation * Supabase schema/migration cleanup * Webhook debugging * AI workflow safety * Calendar availability logic * Owner approval flow * Deposit and appointment state logic * Dashboard performance and reliability * Running typecheck/lint/build before commits First paid test task: Help stabilize one full booking flow: Client SMS → AI reply → owner approval → deposit → appointment → Google Calendar → dashboard booked state. Requirements: * Strong Next.js + TypeScript experience * Strong Supabase/Postgres experience * Experience with webhooks and API integrations * Comfortable working in an existing codebase * Can read logs and debug production issues * Good communication * Clean commits and clear reports Bonus: * Inngest * Stripe webhooks * Google Calendar API * AI/LLM workflow experience * SMS/Twilio/SendBlue experience * Multi-tenant SaaS experience Budget: $25–$45/hr depending on skill. Starting with a 5–10 hour paid trial. If it goes well, this can turn into ongoing weekly work.