Subhajit Mandal
Ai Engineer @Virtual Employee Pvt. Ltd.
Signup · Get unlimited contacts
WORK HISTORY
Ai Engineer @Virtual Employee Pvt. Ltd.
Kolkata, IN
Architected and implemented a full end-to-end integration between Vapi’s Voice AI Agent and Dentally CRM using FastAPI, Webhooks, and MCP. Designed REST APIs that allow Vapi to directly trigger backend workflows such as fetching appointments, booking slots, updating patient data, and validating dentist schedules in real time. Implemented secure HMAC webhook verification, raw-body logging, and asynchronous processing to ensure reliable communication between Vapi and backend APIs. Leveraged Dentally API (patients, appointments, practitioners) to automate the entire booking flow without manual intervention. Built a flexible conversation → action mapping engine, enabling the Vapi agent to execute custom backend operations using your internal logic. Added support for real-time event handling (incoming calls → API actions), improving booking accuracy and reducing human intervention by 100%. Containerized and deployed the API with proper environment handling, async logic, and error-resistant integrations. Deployed it to AWS EC2.Fixed and improved EC2 deployment for the production Vapi agent backend:Set up Nginx reverse proxy + Uvicorn workersEnabled HTTPS and static IP exposureEnsured 24/7 uptime for Vapi webhook URLsDeployed environment variables + secure credential handlingImplemented continuous logging and observability (request IDs, session IDs, appointment trace IDs) to track real-time booking flows across Vapi → FastAPI → Dentally.Created a debug-mode audit system that records all appointment lifecycles—slot checks, practitioner availability, Dentally payloads, and webhook intents—to eliminate silent failures.Improved overall accuracy of the automated appointment booking system, reducing appointment errors by >95% and ensuring consistent bookings for correct patients.
EDUCATION
Central Board of Secondary Education
Class 10
Central Board of Secondary Education
Class 12, Physics, Chemistry, Mathematics, Biology and English
Maulana Abul Kalam Azad University of Technology, West Bengal formerly WBUT
Bachelor's degree, Electrical Engineering
ABOUT SUBHAJIT MANDAL
AI Engineer with 4+ years of experience building production-grade AI systems and agentic AI applications.I design and deploy AI agents, LLM-powered applications, and backend systems that scale in real-world production environments. What I specialize in:• Agentic AI & AI Automation• Python, FastAPI, Flask• LLMs (OpenAI, RAG, LangChain)• OCR & Computer Vision• SaaS Backend Architecture• AWS (EC2, S3)• Docker & CI/CD pipelines• PostgreSQL & Vector Databases Recent work:• Built an AI Voice Agent for a Dental Clinic (appointment handling & follow-ups)• Developed an AI-powered content repurposing SaaS• Automated CRM workflows using Monday.com APIs• Designed OCR pipelines using Google Vision & Tesseract What I’m looking for:Open to remote AI Engineer, LLM Engineer, Python Backend, and Applied AI roles.Currently building and experimenting with AI agents for real-world business workflows.
This profile is compiled from publicly available professional sources. Unifers is not affiliated with or endorsed by LinkedIn. Request removal of this profile.