Johannes Zillmann
Engineering Lead at Centrum AI
Schkeuditz, Saxony, Germany
Summary
🤩
Rockstar🎓
Top SchoolJohannes Zillmann is an engineering lead with 16 years of experience specializing in Java and distributed systems, currently driving technical delivery at Centrum AI from Saxony, Germany. He combines hands-on engineering with leadership, having held senior software roles at Neebo and Datameer where he focused on scalable backend architectures. An active open-source contributor, Johannes has bridged front-end and back-end work—from implementing PDF-to-Markdown UI features to extending a Zookeeper client with multi-op support and pluggable serialization. He is pragmatic about keeping dependencies current and improving developer ergonomics, demonstrated by upgrading libraries across major Zookeeper versions. Trained in computer science at HTWK Leipzig, he brings a steady, systems-first approach to solving complex integration challenges. Colleagues describe him as a reliable problem solver who pairs deep technical knowledge with a knack for practical tooling improvements.
16 years of coding experience
20 years of employment as a software developer
Diplom Informatik, Diplom Informatik at HTWK Leipzig
English, German
Stackoverflow
1,584reputation
425kreached
56answers
5questions
svelte
top-5%
Github Skills (23)
javascript10
back-end-development10
pdfjs10
zookeeper10
java10
javas10
react10
markdown9
serialization9
data-serialization9
sass9
vue9
markdown-it9
svelte9
html9
Programming languages (13)
Github contributions (5)
sgroschupf/zkclient
Dec 2009 - Oct 2018
a zookeeper client, that makes life a little easier.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:57 commits, 23 PRs, 35 pushes in 8 years 10 months
Contributions summary:Johannes primarily contributed to the development and improvement of a Zookeeper client library. Their work involved adding new functionalities like `createPersistent` methods with parent directory creation, and supporting pluggable serialization mechanisms. They also improved the library's filesystem representation and implemented testing capabilities, demonstrating a focus on extending and refining the core functionality of the Zookeeper client. Further contributions included upgrading the library to Zookeeper 3.3.x and subsequently to 3.4, and adding support for multi operations, indicating a focus on keeping the library up to date with the Zookeeper ecosystem.
zookeeper-clientzookeeperlife
jzillmann/pdf-to-markdown
Nov 2016 - Jul 2021
A PDF to Markdown converter
Role in this project:Front-end Developer
Front-end DeveloperContributions:3 reviews, 248 commits, 21 PRs in 4 years 9 months
Contributions summary:Johannes primarily contributed to the front-end development of the PDF to Markdown converter. Their work focused on implementing a drop zone component for image uploads, integrating PDF.js to extract text from PDFs, and building a text rendering/markdown preview. The user also made some minor adjustments to webpack configuration.
markdown-to-pdfpdfmarkdown-convertercommonmarkpdf-generation
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