Automating Client Onboarding with Supabase Edge Functions and Webhooks

Every time I signed a new client, I did the same 15-20 minutes of busywork. Create a record. Set up their folder structure. Provision portal access. Send a welcome email. Log everything. Five steps, every single time, all manual. I run Syntora, a small automation consultancy. The irony of manually onboarding clients at an automation company was not lost on me. So I built a system where signing a proposal triggers all five steps automatically, with zero clicks after the signature. This article walks through the full build: the database schema, the Edge Function that orchestrates everything, the webhook trigger, error handling for partial failures, and RLS policies for client isolation. If you run any kind of agency or SaaS and onboard clients regularly, this pattern will save you serious time. The Architecture The flow is simple: Client signs a proposal (hosted on an external platform). The signing platform fires a webhook to a Supabase Edge Function. The Edge Function orchestrates five