UX Microcopy Writer for Billing App

Looking for a UX writer to rewrite system-generated error messages in a dental billing portal. The current developer-written copy is confusing users. Task involves auditing 40 screens, rewriting approx. 150 elements (form validations, toasts, button labels), and creating a simple Voice and Tone Guide for future updates. Staging link and support logs available to pinpoint the most problematic flows.