Jens-christian Fischer
Senior Security Consultant at Switch
Zurich, Zurich, Switzerland
Summary
🤩
Rockstar🎓
Top SchoolJens-christian Fischer is a senior security consultant and seasoned technology leader with 23 years of experience building cloud infrastructure, security operations, and developer-focused services for Swiss academia. He founded and grew the CommunitySOC for Swiss universities, combining defensive cybersecurity expertise with team and service design to scale SOC capabilities across higher education. A hands-on engineer and former CTO/CEO, he has deep operational experience with OpenStack, Ceph, Kubernetes and Ruby on Rails, and has taught web engineering and security at ZHAW. He blends agile transformation techniques—Sociocracy 3.0, Wardley Mapping, Team Topologies, Kanban/Scrum—with practical sysadmin and development chops, moving organizations toward resilient, people-centered operations. Active in open source, his contributions include backend improvements to ownCloud and international phone-number handling in phony, reflecting a focus on reliable, interoperable systems. Based in Zurich, he’s equally at home crafting infrastructure and mentoring teams to adopt sustainable, secure practices.
22 years of coding experience
25 years of employment as a software developer
Master of Science (M.Sc.) Information Technology, Master of Science (M.Sc.) Information Technology at University of LiverpoolMNG
German, French
Stackoverflow
524reputation
19kreached
4answers
0questions
Github Skills (19)
database-api10
configuration-management10
databases10
php10
owncloud10
database10
shared9
filesystem9
file-management9
file-sharing9
rake6
ruby-on-rails6
activesupport6
bdd6
cucumber6
Programming languages (14)
Github contributions (5)
floere/phony
Aug 2012 - Apr 2013
E164 international phone number normalizing, splitting, formatting.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:39 commits in 7 months
Contributions summary:Jens-christian primarily contributed to the `phony` repository by adding and refining phone number formatting rules for various countries. Their work involved modifying code to correctly format phone numbers, including implementing length validations and handling specific trunk prefixes. The user added support for new countries and updated existing country definitions to improve the accuracy of the number formatting and normalization. These changes significantly improved the library's ability to handle international phone number formats.
phone-numberphonee164international-phonethai
owncloud/core
Jan 2014 - Jun 2015
:cloud: ownCloud web server core (Files, DAV, etc.)
Role in this project:Back-end Developer
Back-end DeveloperContributions:12 commits, 2 PRs, 1 push in 1 year 4 months
Contributions summary:Jens-christian's contributions primarily focus on enhancing the back-end functionality of the ownCloud core. They added a configuration option for the "from" email address, allowing customization of the sender for all emails. Furthermore, they modified code related to file type detection and database interactions, ensuring the efficiency and correctness of existing features. These changes included fixing an error message and optimizing database update operations.
owncloudweb-serverjstreeself-hostingjavascript
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