Retell AI Voice Agent Developer — Build Our Voice AI Booking Agent

We're a US-focused martial arts client acquisition agency. We need an expert who has shipped real, human-sounding voice agents on Retell AI to build us a lead-qualifying, appointment-booking voice agent for our clients. That sounds HUMAN LIKE. This is a one-off build to start. If it performs, there's a strong chance it becomes an ongoing retainer building and maintaining voice agents across our client base. We're looking for a real expert, not the cheapest bid. What you'll build: A Retell AI agent that qualifies leads (e.g. by age) and books a trial into the correct calendar via function calling A genuinely human-sounding voice using ElevenLabs / Cartesia — not platform-default voices Write-back into GoHighLevel: bookings and caller details land in our CRM automatically Required: Proven Retell AI builds you can DEMO with live call recordings — not screenshots, not 'I can build it' Hands-on ElevenLabs/Cartesia voice configuration for phone calls GoHighLevel integration experience (calendars, custom fields, write-back) Clear English and strong async communication Shortlisted candidates complete a short PAID test build before we award the project. Start your proposal with the numbers 88 so we know you read this — proposals without it are skipped.