I will build ai voice agents, retell ai, vapi, and twilio workflows


Level 1
About this gig
Are you looking to automate your inbound phone calls, customer support, or outbound sales outreach using ultra-realistic AI voice agents?
I am a Senior AI Systems Architect specializing in conversational AI engineering, voice pipeline integrations, and real-time LLM workflows. I help businesses build and deploy custom AI voice agents using Vapi AI, Retell AI, OpenAI Realtime API, and Twilio.
Services Offered:
- Custom Voice Agent Setup: Provisioning realistic voice models on Vapi.ai or Retell AI with tailored prompt engineering.
- Function Calling & Tools: Connecting voice bots to external APIs, Calendly booking, CRM systems, and custom database webhooks.
- Twilio & Phone Integration: Configuring inbound/outbound phone numbers, SIP trunking, and call routing workflows.
- Custom Python Backends: Asynchronous API servers to handle real-time tool calls, data processing, and call summaries.
- Analytics & Transcripts: Storing call logs, recordings, and structured extraction in PostgreSQL, Supabase, or Airtable.
Automate your phone calls today. Send a message with your call flows and requirements to get started!
Get to know Shahid
Expert in Web and Mobile Solutions, Automation, AI, SaaS, Dashboards and Apps
Level 1
- FromPakistan
- Member sinceMay 2017
- Avg. response time1 hour
- Last delivery3 months
Languages
English
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FAQ
Which platform do you recommend between Vapi.ai and Retell AI?
Vapi offers rapid integration for custom function calling and complex tools, while Retell AI provides exceptionally low-latency conversational dynamics for natural voice interactions. I configure either platform based on your latency and workflow requirements.
Can the voice agent book appointments directly into my calendar?
Yes. I configure function calls using custom webhooks or tools (Cal.com, Google Calendar, or custom APIs) so the agent checks live availability and confirms bookings mid-call.
Do I need my own Twilio or API accounts?
Yes. You will need active API keys for your preferred voice provider (Vapi/Retell) and a Twilio account for phone number provisioning so you maintain full ownership of your telephony infrastructure.

