Yash Kumar

"Just let the AI query the database" is how you build a data breach.

I do let an LLM write SQL against a customer's database. It's genuinely useful — "how many patients missed follow-ups last month?" answered in plain English. But a model that can emit arbitrary SQL against live...

"Why does my RAG keep pulling the wrong chunk?" Because most RAG is one dumb step: embed the query, cosine-search a vector DB, stuff the top 5 into the prompt. That's the demo. It works right up until someone searches for an exact term - a product code, a name, an acronym — and...

Everyone's shipping AI demos. Almost nobody writes about what breaks when real users and real money hit them. So I'm going to. Twelve posts on the unglamorous problems behind production systems I've built solo. Once a while: 01/12

Most RAG demos retrieve the wrong chunks, mine...

SQL or NoSQL to build something like Twitter? It's one of the most common system design questions out there and it's a bit of a trap. Because the honest answer isn't a database. It's knowing where the actual bottleneck lives. For anything Twitter-shaped, the hard part was never...