Santhosh Kumar

Full-Stack Developer | Python · React · FastAPI · LangChain · Docker | Open to Work

Talent

CoimbatoreMember since 7 May 2026

React.jsMongoDBRedisLLM IntegrationLangChainDockerNginxWebSocketStripeRBAC

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React.jsMongoDBRedisLLM IntegrationLangChain

About

Full-Stack Developer with 1 year of experience building scalable SaaS, AI-powered, and real-time applications using React, FastAPI, Redis, and LLM integrations. Experienced in multi-tenant systems, WebSocket architecture, Role-Based Access Control, and containerized on-premise deployments. Actively seeking new opportunities to contribute to innovative product teams.

Experience

Full-Stack Developer at LeanLytics Solutions (2025-04 – Present)

SaaS and AI product development company

Built a multi-tenant AI chatbot SaaS platform integrating WhatsApp, Instagram, Messenger, and web channels via a unified webhook architecture.
Implemented RAG pipeline using Qdrant vector database and LangChain for semantic document search and context-aware retrieval.
Designed real-time conversation pipeline using Redis Pub/Sub for message context management and synchronization across multiple channels.
Integrated Stripe billing (subscriptions and webhooks) and Zoho CRM for complete customer lifecycle management.
Built RESTful APIs using FastAPI with scalable MongoDB schemas ensuring strict multi-tenant data isolation.
Engineered a real-time ticket queue system using Redis sorted sets and Pub/Sub to manage the full ticket lifecycle with high performance.
Designed WebSocket-based event broadcasting system for real-time updates across kiosks, operator panels, and admin dashboards.
Developed a drag-and-drop kiosk layout builder using JSON schema storage and JWT-based RBAC for role-specific access control.
Integrated TTS announcements (English/Arabic), SMS notifications with credit management, and a KPI dashboard for performance tracking.
Dockerized deployment (FastAPI, MongoDB, Redis, Nginx on Ubuntu Server) supporting 10,000+ tickets/day, 50 concurrent operators, and 10 display screens.