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 SynthID Works: Build a Watermark in Python
Build the green-list watermark on GPT-2 and detect it from text alone at p = 3.07e-56. Then find out how few tokens it needs and how much editing it survives.
ai-engineeringHow SynthID Works: Build a Watermark in Python
Build the green-list watermark on GPT-2 and detect it from text alone at p = 3.07e-56. Then find out how few tokens it needs and how much editing it survives.
ai-engineeringWhat Three Audits Found in My Own LangGraph Book
The factual claims held. What broke was scope - and the audit that caught the book's scope error made one of its own.
ai_mlChat Templates: The Last Unowned Layer in Your LLM Stack
Hugging Face named it the Silent Performance Killer in 2023. By 2026 the word silent was gone from the docs, and when they built the return path they chose JSON over Jinja.
My Books
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.
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