Senior AI/ML Engineer

Hi, I'm Caleb Stephen.

I build agentic AI systems that are actually load-bearing — I lead engineering on kAInet, Express Analytics' agentic marketing platform — architecture, LangGraph multi-agent orchestration, and evaluation for systems businesses actually depend on. Not demos.

See my work Read my writing

$ whoami

Senior AI/ML Engineer, Express Analytics

$ current --focus

kAInet — agentic marketing platform

$ stack

LangGraph · multi-agent orchestration

$ research --prior

Max-Planck-Institut für Radioastronomie

About

A quick introduction

I build agentic AI systems that are actually load-bearing — not chatbots wrapped in a demo. As Senior AI/ML Engineer at Express Analytics, I lead a team of engineers building kAInet, our agentic marketing platform: architecture, orchestration, client strategy, and hiring.

Before this, I did AI research at the Max Planck Institute for Radio Astronomy, worked at a startup building AI-powered chat systems, and studied at Karunya Institute of Technology & Sciences, where I published 7 papers and 1 patent.

I'm starting to write about what actually goes into production agentic systems — orchestration, tool design, evals, and the gap between agent demos and agents that hold up.

Senior AI/ML Engineer

7 Papers Published

1 Patent

2+ Yrs Production AI

Experience

Where I've worked

Senior AI/ML Engineer · Express Analytics

Jan 2026 — Present

Pune District, India · Remote

—Leading a team of engineers building kAInet, Express Analytics' agentic marketing platform — architecture, multi-agent orchestration, and evaluation
—Designing agentic systems for end-to-end prospect marketing, automating campaign strategy and execution pipelines
—Partnering directly with enterprise clients on AI strategy and technical pre-sales
—Leading technical hiring and interviews for the AI/ML team

Agentic AI DevelopmentLangGraphMulti-Agent Orchestration

Data Scientist · Express Analytics

Jan 2025 — Jan 2026

Irvine, California · Remote

—Built Oyster, a web-based analytics platform integrating Lookalike Modeling, RFM, CLTV, VOCA (GenAI-powered), MMM, and MTA
—Developed and maintained scalable FastAPI backend services with full test/review ownership before production deployment
—Designed custom conversational AI chatbots for client websites
—Developed a HIPAA-compliant AI solution for medical Review of Records — record splitting, classification, and report generation with domain-specific GenAI models

PythonFastAPIStatistical Data AnalysisGenAI

Software Engineer · Zuro

Jul 2024 — Dec 2024

San Francisco, California · Remote

—Contributed to AI-powered chat systems using modern frameworks
—Built microservices and APIs for system integration
—Developed and maintained a Chrome extension improving product accessibility

PythonLarge Language ModelsMicroservices

Artificial Intelligence Researcher · Max-Planck-Institut für Radioastronomie

Jan 2024 — May 2024

Bonn, Germany · Remote

—Applied Support Vector Machines and linear models to research problems in radio astronomy

SVMLinear Models

Java Software Developer · Sanctus Technologies

Jan 2023 — Apr 2023

Coimbatore, India · Hybrid

—Backend development with Java and MongoDB, integrated with a React.js frontend

JavaMongoDBReact

Real Time Systems Developer · Sanctus Technologies

Jun 2023 — Aug 2023

Coimbatore, India · Remote

Training Program · NielsenIQ

Jun 2023 — Jul 2023

Remote

Secretary, ATOM · Karunya Institute of Technology and Sciences

Jun 2023 — Apr 2024

Coimbatore, India

Student Coordinator, MS Center for AI & Data Science · Karunya Institute of Technology and Sciences

Sep 2022 — Jun 2023

Coimbatore, India

Projects

Selected work

kAInet

Agentic marketing platform built at Express Analytics — describe campaign goals and it handles targeting, budgets, copy, and creatives across Google and Meta Ads in about 15 minutes. Leading architecture and multi-agent orchestration.

LangGraphMulti-AgentAgentic AI

Computer Vision Food Recognition App

Inspector Diet analyzes a photo of a plate of food and returns nutritional value per item. YOLOv8 and YOLOv5 models served via a Django REST API, consumed by a native Android app.

YOLOv8DjangoAndroid

Nuriel — JupyterLab Extension

A JupyterLab server extension for code optimization, summarization, and explanation — at the cell level and across an entire notebook.

JupyterLabLLM Tooling

LangChain RAG Application

A Flask app for chatting with an LLM or uploading documents and querying them directly, built on LangChain, Ollama embeddings, and Chroma vector store.

LangChainRAGChroma

Brain Computer Interface

Funded research project building a machine learning model to classify EEG signals into predefined action classes. Patent published; only a sample test version is public.

EEGSignal ProcessingPatent

U.S. Election Data Visualization

An interactive Tableau dashboard visualizing the 2016 U.S. Presidential Election results, sourced from government data.

TableauData Visualization

Writing

Agents onward: why I'm writing about production agentic AI

The gap between an agent that looks impressive in a demo and one that's actually load-bearing is where all the real engineering lives — and almost nobody writes about it.

Let's build something.

Open to conversations about agentic AI systems, production ML, or just geeking out over multi-agent orchestration.

Email me