LLMs Engineering — WritingPractitioner notes on shipping LLM systems: RAG, agents, fine-tuning, and LLMOps.https://llmsengineer.com/en-usWhat is RAG, and when should you use it?https://llmsengineer.com/blog/what-is-rag/https://llmsengineer.com/blog/what-is-rag/A plain-English guide to retrieval-augmented generation — what it is, what problem it solves, and when it's the right tool (and when it isn't).Wed, 13 May 2026 00:00:00 GMTWhat is an AI agent? A plain-English guidehttps://llmsengineer.com/blog/what-is-an-ai-agent/https://llmsengineer.com/blog/what-is-an-ai-agent/Agents are not chatbots. A plain-English explanation of what AI agents actually are, where they help, and where they make things worse.Tue, 12 May 2026 00:00:00 GMTWhat is LLMOps, and why does production AI break without it?https://llmsengineer.com/blog/what-is-llmops/https://llmsengineer.com/blog/what-is-llmops/Shipping an AI feature is the start, not the finish. LLMOps — in plain English — is everything you need so it keeps working once real users find it.Mon, 11 May 2026 00:00:00 GMTFine-tuning, prompting, or RAG: which one do you actually need?https://llmsengineer.com/blog/fine-tuning-vs-prompting-vs-rag/https://llmsengineer.com/blog/fine-tuning-vs-prompting-vs-rag/Three very different ways to make an AI behave the way you want — explained without jargon, with a simple rule for picking between them.Sun, 10 May 2026 00:00:00 GMTDifferent ways to build a RAG system, in plain Englishhttps://llmsengineer.com/blog/rag-stacks-compared/https://llmsengineer.com/blog/rag-stacks-compared/Naive RAG, hybrid retrieval, reranking, multi-vector. The main approaches to building a RAG system — without the jargon.Sat, 09 May 2026 00:00:00 GMTAgentic RAG: when your assistant should think before it searcheshttps://llmsengineer.com/blog/agentic-rag/https://llmsengineer.com/blog/agentic-rag/What happens when retrieval-augmented generation meets AI agents — and why it can turn a Q&A bot into a research assistant.Fri, 08 May 2026 00:00:00 GMTFrom RAG demo to production: the checklist nobody gave youhttps://llmsengineer.com/blog/rag-production-checklist/https://llmsengineer.com/blog/rag-production-checklist/Most RAG systems look great in a notebook and embarrassing in production. Here is the gap nobody warns you about, and the checklist that closes it.Thu, 07 May 2026 00:00:00 GMTChoosing an LLMOps stack: LangSmith, LangFuse, LangWatch comparedhttps://llmsengineer.com/blog/llmops-stack-comparison/https://llmsengineer.com/blog/llmops-stack-comparison/Three tools, overlapping pitches, very different strengths in practice. Where each one wins, and how to pick without locking yourself in.Wed, 06 May 2026 00:00:00 GMTBuilding reliable AI agents: evaluation, guardrails, and the loop that won't endhttps://llmsengineer.com/blog/building-reliable-agents/https://llmsengineer.com/blog/building-reliable-agents/Agents fail in characteristic ways. Here are the failure modes worth designing for — and the patterns that turn an unreliable agent into something you can deploy.Tue, 05 May 2026 00:00:00 GMT