Santhosh Kumar

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.

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.

M.Sc. in Information Technology – Sri Ramakrishna College of Arts & Science (2023 – 2025)

B.Sc. in Information Technology – Bharathiar University (2019 – 2022)

Diploma in Computer Networking – PSG Polytechnic College (2015 – 2018)