A production-ready SaaS platform for AI-enhanced OCR, transforming handwritten and printed documents into professionally formatted PDFs. Key achievements: - Designed and built the platform end-to-end, covering frontend, backend, AI integration, real-time processing, and cloud infrastructure - Achieved high-accuracy text extraction on handwritten and complex documents by combining OpenAI GPT-4 Vision with OCR pipelines - Architected a scalable background processing system using Bull queues and Redis, supporting large concurrent document batches with real-time progress updates via Socket.IO - Implemented a complete SaaS model with Stripe subscriptions, usage-based limits, secure authentication (JWT, OAuth 2.0), and multilingual PDF generation