As a Senior Software Developer at Anthill AI, I’ve owned the full stack evolution of backend systems, leading the migration from Java Spring Boot microservices to a robust Python-based AWS serverless architecture (SAM). Leveraging services like Lambda, API Gateway, S3, DynamoDB, and EventBridge, I drove a 40% reduction in infrastructure costs while ensuring 99.9% uptime for over 500,000 users across multiple organizations. I also engineered secure multi-tenant authentication and authorization using Firebase and JWT, with role-based access control and CSV-driven onboarding flows. In parallel, I spearheaded the integration of advanced AI capabilities into our product ecosystem. I built Retrieval-Augmented Generation (RAG) pipelines using LangChain, LangSmith, Deeplake, LlamaIndex, and OpenAI APIs, enabling intelligent, document-based query resolution and reducing response times by 35%. I also developed autonomous AI agents using LangChain's Agent framework and custom AWS workflows.