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I will build ai voice agent with vapi, retell, twilio, synthflow and elevenlabs
Mudassar R
About this gig
Missing calls, losing leads, and paying staff for repetitive work? I'm a Senior Agentic AI Engineer specializing in AI voice agents, AI receptionists, inbound and outbound calling, appointment booking, and CRM sync on OpenAI, Claude, Vapi, Retell AI, Twilio, Synthflow, Bland, Deepgram, and ElevenLabs.
I build production-ready AI voice agents that answer 24/7, qualify leads, book appointments, and sync every call to your CRM, fast, natural, and scalable.
WHAT I OFFER:
- AI Voice Agent Development (Vapi, Retell AI, Synthflow)
- AI Receptionist Setup (Vapi, Retell AI, GoHighLevel)
- Inbound & Outbound AI Voice Agents (Vapi, Twilio, Bland)
- Appointment Booking (Google Calendar, Cal.com, GoHighLevel)
- CRM Sync (GoHighLevel, HubSpot, Airtable & Salesforce)
- AI Voice & Speech Integration (ElevenLabs, Deepgram, Cartesia)
- Multilingual Real-Time Voice (GPT-4o Realtime)
- Twilio Phone Number & SIP Routing Setup
- Post-Call SMS, Email & WhatsApp Follow-Up
- Knowledge Base & FAQ Handling (RAG, GPT-4o, Claude)
Use Cases: clinics, dental offices, HVAC, real estate, law firms, home services, salons, e-commerce support, and cold-call sales teams.
Message me, and I'll recommend the right voice AI setup.
Get to know Mudassar R
Mudassar R
Senior Agentic AI and Automation Engineer, LangChain, RAG, MCP, Python
- FromPakistan
- Member sinceJan 2022
- Avg. response time1 hour
Languages
English, German, French
I'm Mudassar, an Agentic AI & Automation Engineer with 10+ years of experience, specializing in production-ready AI agents, multi-agent systems, and RAG with LangChain, LangGraph, CrewAI, and MCP on ChatGPT and Claude, plus AI voice agents and receptionists on Vapi, Retell AI, and Twilio. I also automate workflows with n8n, Make, Zapier, and APIs for CRM, email, and lead management, and deliver intelligent document processing, automation, and data extraction pipelines using AI OCR and Python. Every build ships with clean code & documentation. Message me with your use case for a tailored plan.
My Portfolio
FAQ
Vapi or Retell AI, which one is better for my business?
Both are great. Vapi gives more developer flexibility for complex call flows. Retell is faster to deploy for receptionist and appointment booking. I recommend the right one based on your use case and volume.
Can the AI voice agent handle both inbound and outbound calls?
Yes. I set up AI calling agents on Vapi, Retell, or Bland that handle inbound inquiries, make outbound follow-up calls, qualify leads, book appointments, and transfer to a human when needed.
Which CRMs, calendars and tools can you integrate?
GoHighLevel, HubSpot, Salesforce, Airtable, Pipedrive, Google Calendar, Cal.com, Calendly, Twilio, and any custom CRM via n8n, Make, or Zapier webhooks
Do you provide the phone number and SIP setup?
I guide you through Twilio or Vapi phone number purchase and set up SIP routing, call forwarding, and business hours. You keep full ownership of the number and telephony account
Which languages and accents are supported?
English plus 30+ major languages via GPT-4o Realtime, Gemini Live, ElevenLabs, and Deepgram. Accents and voice tone are fully customizable to match your brand and target market
How natural do the voices sound?
I use low-latency voices from ElevenLabs, Deepgram, and Cartesia and tune interruptions, pauses, and prompt style. Most callers do not realize it is AI on a normal booking or quote call.
Can the agent send SMS, email, or WhatsApp follow-ups?
Yes. After each call, the workflow triggers SMS via Twilio, email, or WhatsApp follow-ups, updates CRM notes, and can start multi-day nurture sequences using n8n or Make.
What do you need to start?
Message me with your industry, call volume, sample script or FAQs, CRM, and calendar. I confirm scope, recommend Vapi or Retell, and quote a custom package before you order.
