Geert Janssens
CISO Enterprise Architect at Mourik
Netherlands
Summary
🤩
Rockstar🎓
Top SchoolGeert Janssens is a seasoned CISO and enterprise architect with 16 years of experience securing and shaping IT estates across Dutch maritime and pension sectors, now leading security architecture at Mourik. He combines hands-on engineering roots—from MCSE and system/network roles to project management—with strategic security leadership developed as CISO/Architect at Nederlands Loodswezen and adviser roles for pension and civic organizations. Geert is an active open-source contributor with notable backend work on widely used projects like GnuCash and SWIG, improving GUIs and language bindings (Guile) which reflects his attention to interoperability and developer experience. He pairs pragmatic governance (Prince2, corporate CISO training) with a practical appreciation for user-facing details, having moved from graphical specialist to technical leadership—an uncommon blend that helps translate security requirements into usable systems.
16 years of coding experience
24 years of employment as a software developer
project management Prince2, project management Prince2 at ExinCorporate Information Security Officer Information Security, Corporate Information Security Officer Information Security at NorthwaveMCSE Computer Technology/Computer Systems Technology, MCSE Computer Technology/Computer Systems Technology at AzlanGraphical Specialist, Graphical Specialist at Grafisch Lyceum Rotterdam
Dutch, English
Github Skills (19)
c-language10
lib10
integrate10
accounting-software10
gtk10
front-end-development10
scheme10
guile10
cprogramming-language10
swig10
i18n-node9
test-automation9
i18next9
i18n-js9
refactoring8
Programming languages (14)
Github contributions (5)
Gnucash/gnucash
Dec 2009 - Jan 2023
GnuCash Double-Entry Accounting Program.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:269 reviews, 2816 commits, 104 PRs in 13 years 3 months
Contributions summary:Geert primarily focused on adding features and fixing bugs within the core accounting software's GUI (specifically the payment window, and invoice and bill features). They implemented features, refactored code blocks, and fixed bugs related to currency, transaction dates, account selection, and the handling of user preferences and file selections. The user's contributions included modifications to GUI elements, adding functionality to business features and implementing improvements to the user experience.
gnucash
swig/swig
Apr 2018 - Apr 2018
SWIG is a software development tool that connects programs written in C and C++ with a variety of high-level programming languages.
Role in this project:Back-end Developer & Guile Specialist
Back-end Developer & Guile SpecialistContributions:7 commits, 2 PRs, 8 comments in 4 days
Contributions summary:Geert primarily focused on enhancing the SWIG project's Guile integration, demonstrated through modifications to interface files, and test suites. Their work included updating the Guile interface to support Guile 2.0, and later dropping support for older versions. They also made significant changes to the test suite, addressing deprecation warnings and fixing issues, demonstrating a commitment to code quality and compatibility within the Guile ecosystem. Furthermore, they streamlined the Guile interface by removing the -gh interface, opting to use the scm interface instead.
cppprogramming-languageswig
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