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Testimonials

What people say about working with me on machine learning, data infrastructure, and software development projects.

Yohann Doillon

Partner & Chief Commercial Officer at 10x Partners Sàrl

Working together with Johannes has been a great pleasure from day 1. Johannes is a great professional who does not only finds creative ways of solving problems, he's also a great communicator AND listener. I would highly recommend Johannes to anyone who's looking for a dedicated, AI-first and forward-thinking engineer!

Projects: ML-based Body Structure Analysis, Various Palantir Foundry & Claude Code initiatives
Completed: Jan 2026

Armin Soyka

CEO & Co-Founder at The Original Body AG

Johannes was one of the most technically capable and reliable engineers I've worked with. What stood out wasn't just his skill, but his judgment — I found myself consulting him on architecture decisions, team situations, and engineering trade-offs well beyond his immediate scope. He has a rare ability to take on genuinely complex problems and return with solutions that are both elegant and practical. I'd work with him again without hesitation.

Projects: Enterprise Platform Migration, Customer Support Automation, Biomechanical Analysis
Completed: April 2026

Ofer Plesser

Consultant at

I brought Johannes on to help build materials for a cybersecurity training course. After a couple of quick rounds of feedback early on, I could basically hand him work and let him run with it. What came back was consistently good, with almost nothing to correct. Our calls were short, his pricing was fair, and a few times he didn't charge me for things that were small mistakes on his end. He's also just a genuinely interesting person... there's more to him than the technical side, and you feel it in how he thinks through things.

Projects: Cybersecurity Training Course
Completed: May 2025

Phillipp Richter

Spaxx

Johannes truly impressed me with his professionalism and attention to detail, exceeding all expectations in the realm of Data Science & ML. Working with him was a pleasure, thanks to his fluent communication, politeness, and top-notch cooperation. His documentation of the results and work steps was excellent. Highly recommended! 👍

Projects: Screw Manufacturing Optimization
Completed: Oktober 2024

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