AI & Automation guide

Retell AI Development Services — Voice Agents Built for You

I offer complete Retell AI development services — designing, building, integrating and launching AI voice agents that answer calls, book appointments and qualify leads for your business. Here's exactly what I can build for you.

By Arslan AyoubUpdated July 2026AI & Automation guide

✓ Top Rated Plus  ·  ✓ 100% Job Success  ·  ✓ 9+ years experience  ·  ✓ US · UK · EU clients

What I build with Retell AI

End-to-end voice agents for every use case — inbound and outbound.

  • AI receptionists that answer every call 24/7
  • Appointment-booking agents (calendar-integrated)
  • Lead qualification & routing agents
  • Outbound call campaigns
  • Customer support & FAQ agents
  • After-hours & overflow answering

Want this done for you? I'm a Top Rated Plus AI & Automation expert with 100% job success. Get a quote →

The full development service

I handle every step so you get a production-ready agent, not a demo.

  • Use-case & call-flow design
  • Prompt engineering & LLM selection
  • Function setup (booking, transfer, custom webhooks)
  • Knowledge base (RAG) for accurate answers
  • Calendar, CRM & automation integration
  • Testing, deployment & monitoring

Integrations I set up

Your agent wired into the tools you already use.

  • Google Calendar / Cal.com for real bookings
  • HubSpot, GoHighLevel & other CRMs
  • n8n / Make.com for follow-up automation
  • Twilio & telephony
  • Custom APIs via webhooks

Why work with me

A developer who builds reliable, integrated agents — not just a prompt someone pasted in.

  • Production-focused, tested builds
  • Full business-tool integration
  • Guardrails & human handoff
  • Documentation & ongoing support
  • Top Rated Plus, 100% Job Success

Official resources

For primary documentation, see: Make.com · n8n · Zapier.

FAQ

Retell AI Development Services — Voice Agents Built for You — FAQ

What Retell AI services do you offer?

Full Retell AI development: receptionist agents, appointment booking, lead qualification, outbound campaigns, support agents and after-hours answering — designed, built, integrated with your tools, tested and deployed.

How much do Retell AI development services cost?

It depends on complexity — a single-purpose agent is a small fixed project; a fully-integrated, multi-function agent is a larger build. I give a clear quote up front after understanding your use case.

What clients say

Trusted by clients worldwide

★★★★★
Arslan delivered exactly what we needed, on time and with great communication. He understood the requirements quickly and the code quality was excellent.
Upwork Client, Verified Upwork review
★★★★★
Highly skilled developer. He built our automation in Make.com and saved our team hours every single week. Will definitely hire again.
Upwork Client, Verified Upwork review
★★★★★
Excellent Laravel and React work. Professional, responsive and genuinely cared about getting the details right. A pleasure to work with.
Upwork Client, Verified Upwork review
Get in touch

Hire a AI & Automation expert

Tell me about your project and I'll get back to you within 24 hours. Prefer to chat? Message me on WhatsApp.