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 →LLM Wiki Is Not a RAG Replacement - It's a Synthesis-Time Decision
Karpathy's pattern is correct. The community's conclusion that it kills RAG is wrong. Here's the architectural line that actually matters.
ai-engineeringSubagents: How to Run Parallelism Inside a Single Agent Session Without Poisoning the Parent
Every subagent burns its own context so the parent doesn't have to. That's the entire architecture.
ai-engineeringHooks: The Enforcement Layer That Turns Agent Policy Into Agent Fact
Prompts suggest. Hooks enforce. Until you know the difference, your agent's safety guarantees are probabilistic.
ai-engineeringContext Engineering: The Skill That Separates Production Agents from Demos
Prompt engineering tells the model what to do. Context engineering determines whether it can actually do it.
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.