Jonatan Männchen
Chief Information Security Officer
Winterthur, Zurich, Switzerland
Summary
🤩
Rockstar🎓
Top SchoolJonatan Männchen is a CISO and experienced software engineer based in Winterthur, Switzerland, with 12 years of hands-on work across backend systems, security, and open source. He leads security for the Erlang/Elixir ecosystem at the Erlang Ecosystem Foundation, running its CNA and shaping supply-chain and compliance readiness for EU CRA/CISA. Technically rooted in Elixir and Erlang, he has implemented core language tooling (Mix/XDG), contributed security improvements to Phoenix LiveDashboard, and added practical automation in popular projects like Renovate. Jonatan blends product-focused engineering—building GPU-accelerated calculation engines and entity resolution services—with developer education as a course instructor and former consultancy lead. He’s equally comfortable refactoring legacy PHP libraries and designing certified OpenID Connect/FAPI solutions, a mix that surfaces in both his open-source contributions and security program work.
12 years of coding experience
8 years of employment as a software developer
Schulabschluss Sekundarschule Sekundarschule Profil A, Schulabschluss Sekundarschule Sekundarschule Profil A at Schulhaus OberseenEFZ Informatiker Applikationsentwickler, EFZ Informatiker Applikationsentwickler at Berufsbildungsschule Winterthur
English, German, French
Stackoverflow
33reputation
3kreached
1answer
0questions
Github Skills (42)
dependency-management10
cron10
javascript10
dashboard10
erlang10
mixing10
package-management10
elixir10
mixnet10
testing10
wpgraphql10
zip10
refactor10
mixture10
stream10
Programming languages (21)
Github contributions (5)
maennchen/ZipStream-PHP
Nov 2013 - Jan 2023
:floppy_disk: PHP ZIP Streaming Library
Role in this project:
Back-end Developer
Back-end DeveloperContributions:13 releases, 38 reviews, 113 commits in 9 years 3 months
Contributions summary:Jonatan primarily focused on refactoring and code cleanup within the PHP ZIP streaming library. Their commits demonstrate a focus on improving code readability and maintainability by changing variable visibility and removing unnecessary code elements. The user also performed tasks like renaming the license file and converting comments.
stream-httpdiskphpstreamsstreaming
quantum-elixir/quantum-core
Jan 2017 - Jan 2023
:watch: Cron-like job scheduler for Elixir
Role in this project:Backend Developer
Backend DeveloperContributions:44 releases, 64 reviews, 222 commits in 6 years 1 month
Contributions summary:Jonatan's contributions primarily revolved around implementing and testing scheduling functionalities within the Elixir-based project. Their work involved the integration and utilization of the "crontab" Hex package, suggesting a focus on managing and executing tasks based on cron-like schedules. The commits demonstrate the addition of new features and address the support for time-based job execution. The code changes focused on implementing job addition, deletion, activation, and deactivation features for the system.
schedulerelixirjobjob-schedulercron
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