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$
USD
I will build custom ai voice agent using vapi and retell
M Laxsaj
About this gig
Need to automate inbound customer calls or scale outbound appointment booking 24/7?
I engineer ultra-low-latency custom AI voice agents using Vapi and Retell AI that sound natural, handle conversations intelligently, and connect directly to your business stack.
What I Can Build:
- Inbound Receptionist: Answers customer queries 24/7, checks availability, and routes calls.
- Outbound Calling Agent: Automated lead qualification, follow-ups, and calendar booking.
- Telephony Setup: Seamless integration with Twilio phone numbers and SIP trunking.
- CRM & Live Sync: Direct data sync with HubSpot, GoHighLevel, Google Calendar, and n8n.
- Natural Voice Flow: Prompt engineering with realistic voices and objection handling.
Supported Stack:
- Voice Engines: Vapi.ai, Retell AI, ElevenLabs
- LLMs: OpenAI GPT-4o, Claude 3.5 Sonnet
- Telephony & APIs: Twilio, Webhooks, REST APIs
Why Work With Me?
- Low-latency optimization for instant, human-like voice response
- Reliable error handling and structured CRM data extraction
- Full live call testing and setup walkthrough
Please message me before ordering to discuss your call flow and script.
Get to know M Laxsaj
M Laxsaj
Enterprise AI and Autonomous Systems Architect
- FromPakistan
- Member sinceMay 2024
- Last delivery1 year
Languages
English, Urdu
Senior AI Solutions Architect & Full-Stack Engineer with 11+ years of experience engineering enterprise platforms, autonomous AI systems, and scalable cloud applications.
Core Expertise:
• AI & Agents: Multi-agent architectures (CrewAI, LangChain), RAG systems, & LLM integrations.
• Full-Stack & SaaS: Scalable web apps using Next.js, Python (FastAPI), React, & PostgreSQL.
• Automation & APIs: Complex n8n/Make workflows, custom ERPs, & resilient ETL pipelines.
Fractional CTO delivering secure, high-ROI solutions for global startups and enterprises.
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FAQ
How realistic and fast does the AI voice agent respond?
The voice agent achieves sub-800ms latency, delivering instantaneous, natural human-like voice conversations using Vapi/Retell with ElevenLabs or Deepgram voices. It handles interruptions smoothly without awkward pauses.
Can the voice agent book appointments on my calendar during live calls?
Yes. Using custom tool calling and webhooks, the voice agent checks your live calendar availability (Google Calendar, Calendly, or Cal.com) in real time and confirms bookings directly on the call.
Who pays for the phone numbers and telephony call minutes?
Third-party usage fees (Twilio phone number rental, Vapi/Retell platform minutes, and OpenAI LLM tokens) are billed directly to your own accounts. I will guide you through setting these up securely and efficiently.
Can the agent handle angry callers, complex objections, and human handoff?
Yes. I engineer comprehensive objection handling and conversational branching. If a caller requests a human or has an emergency, the agent can immediately forward the live call to your personal or office phone number.
Can you build outbound automated calling campaigns?
Yes. I can set up automated outbound calling pipelines connected to your CRM (HubSpot, GoHighLevel, or Airtable) to automatically call newly submitted web leads within seconds.
