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 →How to Reduce Claude Code Token Usage: A Measured Setup
Shrink what Claude Code re-reads on every turn, stop tool output from flooding the context, and prove the saving with real numbers.
ai-engineeringWhere Jev Belongs in an Agent Harness (Not a Model Swap)
Its ordering is trustworthy and its confidence numbers are not, and that difference decides where in the harness it can safely sit.
ai-engineeringHarnessDev: A Model Can Write What Its Executor Reads
The rest binds the executor, and that is where a self-evolved harness quietly learns the model that wrote it.
ai-engineeringDo You Need an Agent Framework? Start With Plain Code
Eight topologies, one defensible default, and the one condition that should move you off it: when control flow outlives the process.
My Books
Harness Engineering for Production AI Systems
Sensors, Gates, and Bounds for LLM Applications That Have to Work When the Model Doesn’t
Build the control layer around your LLM application: sensors that observe, comparators that check, gates that decide, and bounds that cap.
The 7 GenAI Architectures
A Field Guide to Choosing the Right AI System — Before You Overbuild It
The seven architectures GenAI systems actually get built on, and how to pick the smallest one that solves your problem.
The ChatML (Chat Markup Language) Handbook
A Developer’s Guide to Structured Prompting and LLM Conversations
Learn how to structure prompts using ChatML for predictable, production-ready LLM behavior.
Building Real-World Agentic AI Systems with LangGraph
Designing, building, evaluating, and shipping stateful, durable, multi-agent systems on LangGraph 1.x
A practitioner's guide to designing, deploying, and operating reliable agentic AI systems in the real world.
The Chat Templates Handbook
A Developer’s Guide to Jinja, apply_chat_template, and Rendering Model-Ready Prompts
A curated collection of battle-tested templates for common LLM tasks and workflows.
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.
Past the Demo
One email a week on AI systems that hold up in production: the week's articles, plus one failure mode worth your ten minutes. Under five minutes to read.