Author profile

Rahul Retnan

Senior Software Engineer, RaftLabs

Rahul Retnan is a Senior Software Engineer at RaftLabs who works extensively with large language models and LangChain. He builds AI automation systems for large enterprise deployments. His writing covers practical implementation: what these tools do in production, where they break down, and how to build on them reliably.

Large language modelsLangChainAI automationPythonEnterprise AIBackend engineering

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Published work · 1 article

Articles by Rahul Retnan

01
App Development
OCR vs LLM: How We Built Automated Invoice Scanning
We rebuilt our invoice scanning pipeline using Large Language Models to overcome the limits of traditional OCR. This post shares how we designed a scalable, cost-effective system with Gemini 2.5 Flash, achieving 97% line-item accuracy. Learn how we combined OCR and AI to deliver smarter, automated invoice extraction for high-volume, real-world use cases.