You will get fully custom AI Voice Agents tailored for your Business
Top Rated
Project details
I can help you to design and deploy production-grade AI voice agents that sound natural, respond intelligently, and integrate directly into your existing infrastructure. Built with Vapi.ai, Retell AI, Synthflow, Voiceflow, Bland AI, ElevenLabs, OpenAI, and Gemini APIs, these agents run on top of your SIP trunk or VoIP system and can handle inbound or outbound calls in real time with no IVR menus, and robotic pauses.
Each agent is trained around your business logic and connected to your backend through secure webhooks or APIs. This allows it to fetch or update data from your CRM, ERP, or ticketing system, trigger workflows in n8n, Zapier and perform real actions like sending emails, creating leads, or booking appointments.
So now you will not miss calls or need to do manual follow-ups. Your AI Voice Agent runs round the clock, speaks naturally with customers, understands what they need, and takes real actions. Creating tickets, updating CRMs, and routing complex cases to humans, giving your business a scalable, always-on voice layer.
Each agent is trained around your business logic and connected to your backend through secure webhooks or APIs. This allows it to fetch or update data from your CRM, ERP, or ticketing system, trigger workflows in n8n, Zapier and perform real actions like sending emails, creating leads, or booking appointments.
So now you will not miss calls or need to do manual follow-ups. Your AI Voice Agent runs round the clock, speaks naturally with customers, understands what they need, and takes real actions. Creating tickets, updating CRMs, and routing complex cases to humans, giving your business a scalable, always-on voice layer.
AI Algorithms
Large Language Model, YOLOAI Applications
AI Chatbot, AI Content Creation, AI Mobile App Development, AI Text-to-Speech, AI-Generated Code, Automatic Speech Recognition, Conversational AI, Natural Language Generation, Natural Language Understanding, Object Detection, Speech SynthesisAI Development Language
PythonAI Tools
GitHub Copilot, Hugging Face, PyTorch, Replit, Streamlit, TensorFlowAI Models
ChatGPT, GPT-3, GPT-4, GPT-Neo, LLaMA, OpenAI CodexWhat's included
| Service Tiers |
Starter
$100
|
Standard
$750
|
Advanced
$1,200
|
|---|---|---|---|
| Delivery Time | 3 days | 5 days | 15 days |
Number of Revisions | 1 | 3 | 5 |
AI Model Integration | |||
Batch Normalization | - | - | - |
Database Integration | - | ||
Detailed Code Comments | - | - | |
Image Upscaling | - | - | - |
MLOps | - | - | - |
Model Deployment | - | - | - |
Model Documentation | - | - | - |
Model Monitoring | - | - | - |
Model Testing & Optimization | - | - | |
Model Tuning | - | ||
Natural Language Processing | |||
NLP Tokenization | - | - | - |
Pre-Training | - | ||
Prompt Engineering | |||
Setup File | - | - | |
Source Code | - |
66 reviews
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RM
Rust M.
Jun 27, 2026
Mech AI Development | AI, Full stack Engineering
Really happy with the results. He understood the requirements quickly, handled both frontend and backend parts without issues, and was easy to work with the whole time. Highly recommend.
RM
Rust M.
Jan 19, 2026
Full Stack Engineer Needed for Angular/CapacitorJS Project Enhancements
It was a pleasure working with Nikunj throughout this project. He took full ownership of our AI-powered automotive platform and treated it like his own product, delivering meaningful, production-level improvements across both web and mobile.
What truly set him apart was his ability to understand the vision. He didn’t just focus on writing code or following tickets. He understood how the product is used, asked thoughtful questions, and challenged assumptions when something didn’t make sense. That approach led to better decisions and noticeable improvements in usability and system reliability.
On the technical side, he resolved critical issues, added new important features, and strengthened overall platform stability across devices. His work made the platform more dependable, easier to use, and better prepared for real users at scale.
If you’re looking for a senior-level full-stack freelancer who is comfortable with AI integrations, complex data flows, and real-world scalability challenges, I would strongly recommend him. We’d be more than happy to work with him again on future projects.
What truly set him apart was his ability to understand the vision. He didn’t just focus on writing code or following tickets. He understood how the product is used, asked thoughtful questions, and challenged assumptions when something didn’t make sense. That approach led to better decisions and noticeable improvements in usability and system reliability.
On the technical side, he resolved critical issues, added new important features, and strengthened overall platform stability across devices. His work made the platform more dependable, easier to use, and better prepared for real users at scale.
If you’re looking for a senior-level full-stack freelancer who is comfortable with AI integrations, complex data flows, and real-world scalability challenges, I would strongly recommend him. We’d be more than happy to work with him again on future projects.
BJ
Brian J.
Dec 12, 2025
You will get Cross-Platform Android & iOS mobile app using React Native & Angular/Ionic
Knowledgeable, proactive, and thorough. Highly skilled developer with strong problem solving skills. Highly recommended.
NJ
Niki J.
Oct 10, 2025
Update Android App
Nikunj was prompt with response and technically very good. We would recommend him, and will use him, again.
KY
Krishna Y.
Aug 25, 2025
Web developer (typescript, javascript, python, css)
Nik has implemented LLM and RAG features, integrated OpenAI/PyTorch components, and optimized our APIs for speed and reliability. His problem-solving, clean code, and proactive communication stand out. he worked independently and documented everything clearly. I would gladly hire him again for any GenAI, AI Agents work.
About Nikunj
Senior Full Stack AI Engineer | React | Python | Capacitor | RAG | LLM
100%
Job Success
Surat, India - 6:26 pm local time
I’ve been working on Upwork since 2016 and have helped 74+ clients worldwide with a 100% Job Success Score. I have delivered 50+ web projects and 30+ mobile apps across SaaS, AI, healthcare, POS, education, field services, fantasy sports, and business automation.
My core stack includes React, Next.js, Angular, React Native, Ionic, Capacitor, Node.js, NestJS, Python, FastAPI, Django, Firebase, Supabase, PostgreSQL, MongoDB, AWS, GCP, Azure, Vercel, and DigitalOcean.
I build clean frontend architecture, scalable APIs, admin dashboards, mobile apps, subscription systems, RBAC, real-time workflows, third-party integrations, and production deployment pipelines. I also handle App Store and Play Store submissions, approvals, rejections, deep links, push notifications, in-app purchases, and mobile release workflows.
I also build AI-powered products using OpenAI, Gemini, Claude, LangChain, LangGraph, Vapi, ElevenLabs, Cursor, Claude Code, GitHub Copilot, Lovable, Bolt, and Replit. My work includes AI copilots, voice agents, RAG pipelines, intelligent search, workflow automation, semantic retrieval, and LLM-based SaaS features.
I can help with:
* SaaS MVP development
* React, Next.js, and Angular apps
* React Native, Ionic, and Capacitor apps
* AI chat, voice agents, copilots, and automation
* Firebase and Supabase apps
* Node.js, NestJS, Python, FastAPI, and Django APIs
* Dashboards, RBAC, subscriptions, and admin panels
* App Store and Play Store deployment
* Cordova to Capacitor migration
* Legacy app cleanup, bug fixing, and performance improvement
How I work:
* Clear scope and realistic milestones
* Direct communication and regular updates
* Clean Git workflow with branches and PRs
* Proper testing before handover
* Deployment notes and next-step recommendations
I use AI-assisted development to move faster, but I do not blindly ship AI-generated code. Every important part is reviewed, tested, and handled with production quality in mind.
Send me a short description of what you are building, and I’ll come back with a clear approach, timeline, and fit.
Steps for completing your project
After purchasing the project, send requirements so Nikunj can start the project.
Delivery time starts when Nikunj receives requirements from you.
Nikunj works on your project following the steps below.
Revisions may occur after the delivery date.
Business Needs & Call Flow Mapping
We will start by clarifying your goals whether it’s answering FAQs, booking appointments, qualifying leads, or reducing missed calls. I will map out your ideal customer journey, define conversation logic, and identify key integrations.
Voice Agent Design & Personality Setup
I will configure a natural-sounding voice using your preferred model, set speaking style (tone, pace, pauses), and build custom prompt engineering with OpenAI GPT-4 or Gemini to ensure your agent speaks like a real representative of your brand.