You will get an AI voice agent that books real appointments over a phone call
Project details
Project details:
Based on my AI Appointment Scheduler — a caller talks naturally to an AI, which checks live Google Calendar availability, books/reschedules/cancels, and confirms by voice. Fully idempotent so no duplicate bookings, with a swappable voice-provider layer.
Tech stack: Node.js, Express, MongoDB, Twilio, Vapi, Retell, Google Calendar API
Coding Expertise: Agentic AI Tool-Calling, Webhook Signature Verification, Idempotent Booking Logic
Based on my AI Appointment Scheduler — a caller talks naturally to an AI, which checks live Google Calendar availability, books/reschedules/cancels, and confirms by voice. Fully idempotent so no duplicate bookings, with a swappable voice-provider layer.
Tech stack: Node.js, Express, MongoDB, Twilio, Vapi, Retell, Google Calendar API
Coding Expertise: Agentic AI Tool-Calling, Webhook Signature Verification, Idempotent Booking Logic
Purpose
BusinessIndustry
Agriculture, Architecture & Interior Design, Beauty & Cosmetics, Biotech, Business Services & Consulting, Construction, Ecommerce, Education, Engineering, Environmental, Fashion & Apparel, Financial Services, Government & Public Sector, Marketing & Advertising, Medical & Pharmaceutical, Retail & Wholesale, Software, Telecommunications, Travel & TourismLanguage
EnglishWhat's included
| Service Tiers |
Starter
$300
|
Standard
$500
|
Advanced
$750
|
|---|---|---|---|
| Delivery Time | 10 days | 18 days | 30 days |
Number of Outbound Calls | 100 | 200 | 300 |
Scriptwriting | - | - | - |
Summary Report | - | - | - |
Lead List | - |
About Md Al Amin
Senior .NET, Node.js & Next.js Developer | Enterprise ERP Systems
Dhaka, Bangladesh - 11:28 pm local time
For the last 8+ years, I've designed and delivered enterprise-grade ERP systems for garment, textile, dyeing, printing, and leather manufacturing in Bangladesh HRMS, Payroll, Production, Finance, Costing, Commercial, SOP, and ESS platforms that thousands of employees depend on every single shift. These aren't demo projects they're systems running in live factories, where downtime has a real cost and every workflow has to match how the floor actually operates.
My core stack is ASP.NET Core / ASP.NET MVC, C#, and SQL Server, built on Clean Architecture, CQRS, and MediatR with a strong focus on query optimization, async performance, and building systems that stay maintainable as they grow. I've also worked extensively with AngularJS, jQuery, and Bootstrap on the frontend side of enterprise dashboards, and I'm comfortable diagnosing deep, hard-to-reproduce issues — from IIS threading deadlocks in production APIs to fixing broken async/await patterns that silently degrade performance under load.
I'm now deliberately expanding into modern full-stack JavaScript Next.js, React, Node.js, Express.js, PostgreSQL, and MongoDB because the next generation of enterprise software is cloud-native, and I want to be building it, not catching up to it. I'm currently building SportNest, a Next.js web application with OAuth authentication and a split client/API deployment on Vercel, which has sharpened my hands-on experience with modern deployment pipelines, CORS configuration, and production auth flows the exact pain points a lot of enterprise developers skip over.
What I bring to a project:
8+ years shipping production ERP systems for real manufacturing environments, not prototypes or portfolio pieces
Deep understanding of complex business workflows (HR, payroll, production, finance, costing) I design software around how the work actually happens, not around a generic template
Clean, maintainable architecture (Clean Architecture, CQRS, MediatR) that scales with your team instead of becoming technical debt
Strong debugging instincts for production-grade issues: threading deadlocks, async/await pitfalls, large-file upload handling, and query performance under real load
Full reporting/document stack: PDF generation (iTextSharp), Crystal Reports, Excel exports (EPPlus)
Growing full-stack JavaScript capability (Next.js, React, Node.js/Express), so I can bridge legacy enterprise systems with modern cloud-native frontends
Comfortable owning a project end-to-end from database design and API architecture through to deployment and production support
Technical Skills
Languages: C#, JavaScript
Backend: ASP.NET Core, ASP.NET MVC, Node.js, Express.js
Frontend: Next.js, React, Angular/AngularJS, Bootstrap, HTML/CSS, jQuery
Databases: SQL Server (2014–2019), PostgreSQL, MongoDB
Architecture & Patterns: Clean Architecture, CQRS, MediatR, Dapper, RESTful APIs
Reporting & Documents: iTextSharp (PDF), Crystal Reports, EPPlus (Excel)
Auth & Deployment: OAuth, Vercel, IIS
Version Control: Git, GitHub, Bitbucket, SVN
Task Management: Trello, MeisterTask
I studied Computer Science at Daffodil International University in Dhaka, and I currently work as a Sr. Software Engineer at Epyllion Group. Beyond the technical stack, what I actually bring to a project is this: I take the time to understand the real problem before writing a single line of code, and I build software that disappears into the workflow instead of forcing people to work around it. That mindset is what's kept my ERP systems running reliably for thousands of daily users, and it's the same mindset I bring to every new stack I pick up.
If you need a developer who can either modernize a legacy enterprise system or build something cloud-native from scratch and who takes ownership of the whole problem, not just the ticket in front of them. let's talk.
Steps for completing your project
After purchasing the project, send requirements so Md Al Amin can start the project.
Delivery time starts when Md Al Amin receives requirements from you.
Md Al Amin works on your project following the steps below.
Revisions may occur after the delivery date.
AI Voice Agent / Automated Booking System
AI Appointment Scheduler with Voice AI, Google Calendar, Live Availability, Booking, Rescheduling & Cancellation—built with idempotent workflows and a flexible voice-provider layer.