Markus Holtermann
Software Engineer at Kraken Technologies
Summary
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RockstarMarkus Holtermann is a seasoned software engineer with 15 years’ experience based in Berlin, specializing in backend development and the Django ecosystem. As a core contributor to django/django and maintainer-level contributor to key projects like django-two-factor-auth and djangoproject.com, he focuses on migrations, security fixes, testing, and keeping projects aligned with modern practices. He combines deep framework knowledge with practical maintenance skills—fixing tricky migration bugs, addressing CSRF and Docutils vulnerabilities, and modernizing repo workflows. Beyond code, Markus has organized major Python conferences (DjangoCon Australia, EuroPython) and brings community leadership and cross-project stewardship to every codebase he touches.
15 years of coding experience
Github Skills (24)
database-migrations10
git10
py10
python10
django10
testing10
user-authentication10
authentication10
two-factor-authentication10
database-migration10
debugging9
html8
documentation8
template-engine7
templater7
Programming languages (15)
Github contributions (5)
django/djangoproject.com
Feb 2015 - Mar 2021
Source code to djangoproject.com
Role in this project:
Back-end Developer
Back-end DeveloperContributions:5 reviews, 8 commits, 17 PRs in 6 years 2 months
Contributions summary:Markus made several contributions focused on maintaining and improving the Django-based website. They addressed security vulnerabilities related to Docutils file inclusion and fixed CSRF token issues. The user also updated the website's code to reflect the change from "master" to "main" branch naming in the repository, demonstrating a commitment to keeping the project up-to-date with modern practices. Furthermore, they updated the download page for the 3.0 Django release.
djangoxadminpythondjangoproject
django/django
Jan 2022 - Jan 2022
The Web framework for perfectionists with deadlines.
Role in this project:Back-end Developer
Back-end DeveloperContributions:25 reviews, 4 commits, 251 PRs in 1 day
Contributions summary:Markus primarily contributed to the Django framework by fixing bugs related to the migration system. Their work involved modifying code in multiple files related to migration commands, writing and fixing tests, and improving the serialization of data used in the migration files. The user also addressed issues in the admin documentation.
web-frameworkpythondjangoframeworkorm
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