Blog

Notes on backend engineering, cloud architecture, and applied AI.

Long-form write-ups on the systems I build — architecture decisions, AWS infrastructure, and lessons from shipping AI products in production.

Illustration of a customer chatting with an AI support agent that routes to a knowledge base, order API, payment API, and human escalation

Building a Production AI Customer Support Agent: FastAPI, LangGraph, RAG & Tool Calling

A chatbot that answers FAQs is a solved problem. An agent that checks real order and payment data and knows when to escalate to a human is a different system — here's the architecture, the LangGraph agent loop, and the code.

Jigar Prajapati Sep 17, 2026 14 min read

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Diagram showing a Zapier automation workflow being replaced by an AWS Lambda function

Replacing Zapier with AWS Lambda: A LinkedIn Easy Apply Case Study

LinkedIn's Easy Apply feature doesn't give you an API — it gives you an email. How a 71-line AWS Lambda replaced a $100/month Zapier workflow, with real cost numbers.

Sep 8, 2026 9 min read

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Notes on backend engineering, cloud architecture, and applied AI.

Building a Production AI Customer Support Agent: FastAPI, LangGraph, RAG & Tool Calling

From the archive.

Replacing Zapier with AWS Lambda: A LinkedIn Easy Apply Case Study