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Tejas P Mehta

Practical AI for Developers, PMs & Founders

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AI & LLMs

Practical guides to working with large language models: prompting, chatbots, AI coding tools, AI code review, and evaluating and deploying AI features.

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Evaluating a RAG bot and shipping it as a web chat
Posted inAI & LLMs PHP Tutorials RAG Tutorial Series

Episode 8 — Evaluating & Shipping

Posted by By Tejas P Mehta July 23, 2026
From "seems good" to "measurably good" to "live" For two episodes I've been repeating the…
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Keyword and vector search combined, with a shield blocking a malicious note
Posted inAI & LLMs MySQL & Databases PHP Tutorials RAG Tutorial Series

Episode 7 — Improving Quality: Hybrid Search, Reranking & Guardrails

Posted by By Tejas P Mehta July 23, 2026
"Works on my questions" isn't "works" Episode 6 gave us a real, grounded, cited bot.…
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An AI answer with numbered citations linked to source documents
Posted inAI & LLMs PHP Tutorials RAG Tutorial Series

Episode 6 — Generation: Grounded Answers with Citations

Posted by By Tejas P Mehta July 23, 2026
The last mile Five episodes of groundwork come together here. We can load documents, chunk…
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Filtering search results with top-K and a similarity threshold
Posted inAI & LLMs PHP Tutorials RAG Tutorial Series

Episode 5 — Retrieval: Top-K, Thresholds & Filtering

Posted by By Tejas P Mehta July 23, 2026
Our search is fast, but it isn't smart After Episode 4, MySQL ranks our chunks…
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Documents being split into small overlapping chunks
Posted inAI & LLMs PHP Tutorials RAG Tutorial Series

Episode 2 — Preparing the Knowledge Base: Loading & Chunking Your Docs

Posted by By Tejas P Mehta July 23, 2026
Where we left off In Episode 1 we cheated. We pasted Nimbus's refund policy into…
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Infographic comparing an LLM answering from memory versus an LLM using RAG to read from a knowledge base
Posted inAI & LLMs PHP Tutorials RAG Tutorial Series

Episode 1 — What Is RAG, and Why Should You Care?

Posted by By Tejas P Mehta July 23, 2026
The problem, in one support ticket Imagine a customer opens a chat on Nimbus's website…
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AI assistant and developer reviewing code together
Posted inAI & LLMs AI-Powered Dev Workflow

AI-Powered Code Review with Claude: What to Check and How to Prompt

Posted by By Tejas P Mehta June 23, 2026
Claude reviews code across six dimensions — correctness, security, performance, readability, test coverage, and edge cases — consistently, every time. This post shows the exact prompts, a worked example with three real bugs, and an honest list of what Claude cannot do.
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CLAUDE.md file connecting the code editor, project folder and AI assistant
Posted inAI & LLMs AI-Powered Dev Workflow

The CLAUDE.md File: Your Secret Weapon for AI-Assisted Coding

Posted by By Tejas P Mehta June 23, 2026
Every time you start a Claude Code session without a CLAUDE.md file, you are starting from zero. This post shows what CLAUDE.md is, the 10 sections it should have, and the full ClientHub example you can copy.
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