Experienced AI Voice/Calling Agent Developer Needed

Nexvora is looking for an experienced AI Voice/Calling Agent Developer to build a production-ready AI calling agent for business use.

We are a business growth and automation agency, and we want to develop an AI voice solution that we can eventually deploy for multiple clients across different industries.

The AI agent should be capable of having natural, two-way voice conversations with customers instead of simply playing prerecorded messages.

What we want to build

The AI calling agent should be able to:

Make and receive phone calls
Speak naturally with customers
Understand spoken responses
Respond dynamically based on the conversation
Follow a predefined conversation flow
Ask and answer questions
Qualify leads
Collect customer information
Schedule appointments
Handle basic FAQs
Transfer calls to a human when required
Send follow-up information through WhatsApp/SMS/email where applicable
Record call outcomes
Store conversation/customer data in a database or CRM
Provide call logs and basic analytics
Example Use Cases

The system should be flexible enough to support use cases such as:

AI Receptionist

Answer incoming business calls
Understand the customer's requirement
Answer common questions
Book appointments
Transfer calls to staff

Lead Qualification

Call leads automatically
Ask qualifying questions
Identify interested prospects
Record their responses
Forward qualified leads to the sales team

Follow-Up Calls

Follow up with existing leads
Remind customers about appointments
Collect feedback
Re-engage inactive leads
Preferred Technology / Experience

We are open to the right technology stack, but experience with the following is highly preferred:

Twilio / Telnyx / similar telephony platforms
OpenAI API / LLM APIs
Realtime voice AI
Speech-to-Text and Text-to-Speech
WebSockets / Webhooks
REST APIs
CRM integrations
WhatsApp API
n8n / Make / Zapier
Python / Node.js
Database integration
Important Requirements

We are not looking for a basic chatbot or a simple IVR system.

We need someone who understands how to build a real conversational voice agent with low latency, reliable call handling, context management, error handling, and human handoff.

The system should be designed in a way that allows us to reuse and customize the agent for different clients and industries without rebuilding everything from scratch.

What We Expect From the Freelancer
Previous experience building AI voice/calling agents
At least 1–2 working projects that you can demonstrate
Clean and maintainable implementation
Proper documentation
Deployment support
Testing and bug fixing
Ability to explain the architecture clearly
Good communication and timely updates
Please Include With Your Proposal
Examples of AI voice agents you have built
Live demo/video/demo call, if available
Technology stack used
Telephony provider used
How you handle interruptions and natural conversations
How you handle human call transfers
Estimated development timeline
Your total project cost
Any recurring costs/API costs we should expect

Preference will be given to freelancers who have already deployed production voice AI systems rather than candidates with only theoretical or tutorial-level experience.

We are looking for a freelancer for a long-term relationship, as successful development may lead to additional AI automation projects for Nexvora and its clients.