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Aranvindh User

@aranvindhuser

Message

I build production AI agents, RAG systems, and scalable backend automation platforms.

India

Message

What I'm looking for

I'm looking to build production AI agents, advanced RAG platforms, and scalable backend systems where I can apply Python, FastAPI, cloud infrastructure, and real-time AI integrations.

I've delivered end-to-end AI business solutions as a freelance Backend and AI Engineer, building domain-specific RAG systems, WhatsApp chatbot integrations, and automation platforms for clients.

I built Rezolve AI, a production RAG chatbot for web and WhatsApp that combines dense retrieval, BM25, FlashRank reranking, persistent chat history, and offline Llama inference. I also automated ingestion from web pages and uploaded documents while implementing PostgreSQL-backed lead capture.

With CallMind, I created a real-time AI voice call agent using LiveKit, WebRTC, SIP, Azure OpenAI Realtime API, and FastAPI. I added text-to-SQL capabilities for live natural-language queries across PostgreSQL, MySQL, and SQLite.

I'm focused on agentic AI, advanced retrieval, and reliable cloud-backed backend systems using Python, AsyncIO, FastAPI, AWS, Azure, Docker, and modern LLM tooling.

Experience

Work history, roles, and key accomplishments

Freelance Backend & AI Engineer

Freelance

Apr 2025 - May 2026 (1 year 1 month)

Delivered end-to-end AI business solutions, designing and deploying RAG systems for domain-specific knowledge retrieval and automation. Built WhatsApp chatbot integrations and backend systems using Flask and FastAPI, deploying on AWS and Azure.

Python fastAPI Flask RAG OpenAI Gemini GROQ OpenRouter AWS Azure Docker WhatsApp Business API

Enterprise RAG Chatbot Backend

Rezolve AI

Built a production-grade RAG chatbot deployed across Web and WhatsApp, implementing hybrid search with FlashRank reranking and a fully offline local LLM. Automated content ingestion and integrated a PostgreSQL-backed lead-capture flow.

fastAPI Qdrant PostgreSQL FastEmbed BM25 FlashRank AsyncIO

Real-Time AI Technical Interview Simulator

TalkHire

Built a real-time AI interview agent using FastAPI and OpenAI's GPT Realtime API, with a low-latency audio pipeline using LiveKit and WebRTC. Implemented an adaptive questioning engine and an automated rubric-based assessment system.

Python fastAPI React TypeScript LiveKit WebRTC OpenAI GPT Realtime SileroVAD AsyncIO Docker

Real-Time AI Voice Call Agent

CallMind

Built a real-time AI phone call agent using LiveKit Agents, WebRTC, and OpenAI's GPT Realtime API, with SIP integration for standard phone networks. Developed a text-to-SQL engine using Vanna 2.0 and FastAPI services with Redis caching.