AI Developer – Voice AI & Conversational AI Solutions

Posted 7 hours ago

Worldwide

Summary

AI Developer – Voice AI & Conversational AI Solutions About the Role We are looking for an experienced AI Developer to design and build advanced Voice AI solutions for real-world business applications. The ideal candidate should have hands-on experience developing multilingual AI voice agents that can handle natural conversations, understand customer intent, and integrate with business systems. This is a project-based role with the potential for ongoing work on multiple AI products. Key Responsibilities * Design and develop AI-powered voice agents capable of handling inbound phone calls. * Build multilingual conversational AI that can communicate naturally in multiple languages. * Develop AI workflows that can: * Answer customer enquiries. * Guide customers through service or product options. * Share menus, pricing, or available services. * Take customer orders. * Book appointments or table reservations. * Collect customer details and confirmations. * Integrate Voice AI with CRMs, booking systems, POS platforms, calendars, and APIs. * Improve conversation quality using prompt engineering and LLMs. * Implement speech-to-text (STT) and text-to-speech (TTS) technologies. * Test, optimise, and continuously improve conversation accuracy and user experience. Required Skills * Strong experience with Large Language Models (OpenAI, Claude, Gemini, Llama, or similar). * Experience building Voice AI applications using platforms such as Vapi, Retell AI, Bland AI, ElevenLabs, LiveKit, or Twilio. * Experience with speech recognition and speech synthesis. * Backend development experience (Python, Node.js, or similar). * API integration experience. * Knowledge of prompt engineering and AI agent orchestration. * Experience deploying scalable AI solutions to cloud platforms. Preferred Experience * Restaurant ordering systems. * Appointment and reservation platforms. * Customer support automation. * Voice AI analytics and monitoring. * Workflow automation using tools such as n8n, Make, or LangGraph. Deliverables The successful candidate should be able to deliver production-ready AI voice solutions that can: * Handle natural phone conversations. * Support multiple languages. * Understand customer intent. * Process orders and bookings. * Integrate with existing business systems. * Escalate complex scenarios when required. To Apply Please include: * Examples of Voice AI projects you have built. * Technologies and AI platforms used. * GitHub or portfolio (if available). * Estimated hourly rate or fixed project pricing. * Your availability and expected delivery timeframe.

  • $500.00

    Fixed-price
  • Intermediate
    Experience Level
  • Remote Job
  • Ongoing project
    Project Type

Contract-to-hire opportunity

This lets talent know that this job could become full time.
Learn more
Skills and Expertise
Mandatory skills
Gemini
Node.js
LangGraph, CrewAI, AutoGen,
Activity on this job
  • Proposals:20 to 50
  • Interviewing:
    0
  • Invites sent:
    0
  • Unanswered invites:
    0
About the client
Member since Aug 3, 2026
  • Australia
    5:19 AM

Explore similar jobs on Upwork

Gen AI Developer (Contract)Fixed-price‐ Posted 2 months ago
AI Agent Development
Python
JavaScript
API
Node.js
Deep Learning
React
PostgreSQL
Football Prediction Tool DeveloperHourly‐ Posted 4 weeks ago
JavaScript
PHP
HTML5
jQuery

How it works

  • Post a job icon
    Create your free profile
    Highlight your skills and experience, show your portfolio, and set your ideal pay rate.
  • Talent comes to you icon
    Work the way you want
    Apply for jobs, create easy-to-by projects, or access exclusive opportunities that come to you.
  • Payment simplified icon
    Get paid securely
    From contract to payment, we help you work safely and get paid securely.
Want to get started? Create a profile

About Upwork

  • Rating is 4.9 out of 5.
    4.9/5
    (Average rating of clients by professionals)
  • G2 2021
    #1 freelance platform
  • 49,000+
    Signed contract every week
  • $2.3B
    Freelancers earned on Upwork in 2020

Find the best freelance jobs

Growing your career is as easy as creating a free profile and finding work like this that fits your skills.

Trusted by

  • Microsoft Logo
  • Airbnb Logo
  • Bissell Logo
  • GoDaddy Logo