Ranjan Kumar
AI & ML Engineer · Author · Educator
I help AI builders design, build, and ship production-grade AI systems that actually work, cost-effectively, through hands-on writing, books, and practical engineering guidance.
Latest Posts
View all →Claude Code on Enterprise WSL: Eleven Errors, Eleven Fixes, and the One Flag Nobody Documents (--bare)
Why Claude Code fails on a corporate laptop in eleven specific ways, and the single flag that closes the cascade.
ai-engineeringHNSW Vector Search Recall Failures in Production
You benchmarked on glove-100. Your users ask long-tail questions. The Index-Access Pattern Mismatch is silently destroying your RAG recall.
ai-engineeringWhy Your RAG Knowledge Base Is Lying About What It Knows
The vector index is a snapshot of your documents at ingestion time. Semantic similarity has no relationship to temporal validity. A document from 18 months ago can score 0.94 cosine similarity and still be completely wrong today - and nothing in the standard RAG pipeline raises a flag.
ai-engineeringWhy Your RAG Pipeline Assembles Context Wrong
Retrieval finds the right document. Context assembly decides whether the LLM reads it. Most teams treat this as a pass-through - and pay for it in accuracy, cost, and latency.
My Books
The ChatML Handbook
Structured Prompting & LLM Conversations
Learn how to structure prompts using ChatML for predictable, production-ready LLM behavior.
Building Real-World Agentic AI Systems
From Prototypes to Production
A practitioner's guide to designing, deploying, and operating reliable agentic AI systems in the real world.
My Toolkit
A collection of tools I've built to boost productivity and simplify workflows.
Developer & AI Tools
Test Your Knowledge
Quiz yourself on AI engineering, observability, and production LLM systems
MedhaV - मेधावी
Start every day with clarity
Imagelly
AI-Based SaaS Image Edit/Enhancement Tool
Mermaid Diagram Generator
Create flowcharts, sequence diagrams, and more
MermAniSt — Mermaid Animation Studio
Turn Mermaid diagrams into animated presentations
LinkedIn Text Formatter
Format your LinkedIn posts with bold, italic, and more
MarkMelon: Markdown Editor
Edit, generate docs from Markdown and more
Slides Creator from Markdown
Generate beautiful presentations from Markdown
What I Write About
AI & ML Engineering
Production-ready AI systems, LLMs, and machine learning deployment strategies.
System Design
Scalable architectures, distributed systems, and infrastructure for AI applications.
Real-World Projects
Case studies, lessons learned, and practical insights from production deployments.