Developer strategist · Author · Speaker

Java. AI.
And the craft of
building software.

I’m Markus. I help Java teams build systems that are fast to change and boring to operate. I share what I learn through writing, books, and talks.

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Markus Eisele smiling, wearing glasses and a gray cap — MARKUS EISELEMUNICH, GERMANY

Java ChampionO’Reilly authorDeveloper advocate at IBM20+ years in enterprise Java

01 / Writing

Explore the publication

The Main Thread

Hands-on Java, Quarkus, and AI. Practical explanations for developers who need to understand how things work—and make them work in their own systems.

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01AI applications with Java

02Quarkus & cloud-native architecture

03Working with coding agents

04Developer experience & productivity

02 / Selected books & reports

All publications

Applied AI for Enterprise Java cover

O’REILLY · 2025

Applied AI for
Enterprise Java

Alex Soto Bueno, Markus Eisele & Natale Vinto

Enterprise Java Design Patterns in the Cloud Native Era cover

O’REILLY · 2026

Enterprise Java Design Patterns in the Cloud Native Era

Markus Eisele

AI Agents with Java cover

FORTHCOMING · 2027

AI Agents
with Java

Alex Soto Bueno, Markus Eisele & Mario Fusco

Markus speaking on stage

03 / On stage

Code is cheap.
Software isn’t.

Bringing AI into large Java codebases without losing control.

WeAreDevelopers World Congress · 2026

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All talks, webinars & podcasts

04 / A little about me

A developer.
Always learning.

For more than 20 years, I’ve worked with enterprise teams on modernizing Java platforms. Today, my work brings together Java, open source, and AI.

I’m based in Munich. You may also know me as myfear.

Let’s connect on LinkedIn