Mika Helenius
System Specialist at Kela
Helsinki, Finland
Summary
👤
Senior🎓
Top SchoolMika Helenius is a seasoned system specialist with 16 years of hands-on experience administering Unix/Linux servers, middleware and large-scale production environments across Nokia, HCL, CSC and Kela in Finland. He combines deep operational expertise—designing test/production architectures, running security audits and mentoring support teams—with practical skills in file delivery integrations, VMware and storage systems. Mika has contributed back-end improvements and security hardening to the widely used open-source CKAN data management platform, showing an interest in data portal tooling beyond day-to-day ops. Known for clear documentation and readiness reviews that make services supportable, he excels at taking services from development to mature, auditable production. Based in Helsinki, he brings a pragmatic, security-minded approach to keeping critical public-sector and library infrastructures reliable.
16 years of coding experience
Did not graduate, Did not graduate at Oulu University of Applied Sciences, Raahe school of Engineering and BusinessMatriculation Examination, Matriculation Examination at Kaleva Senior secondary school, Tampere
English, Japanese, Swedish
Github Skills (6)
ckan10
api10
python10
catalog9
open-data9
postgresql8
Programming languages (3)
Github contributions (5)
ckan/ckan
Mar 2014 - Dec 2014
CKAN is an open-source DMS (data management system) for powering data hubs and data portals. CKAN makes it easy to publish, share and use data. It powers catalog.data.gov, open.canada.ca/data, data.humdata.org among many other sites.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:9 commits in 9 months
Contributions summary:Mika contributed to several aspects of the CKAN data management system, focusing on back-end improvements. Their work included refactoring URL handling logic, adding and testing a new organization autocomplete feature, and implementing security enhancements to prevent external redirects. These changes involved modifications to core controllers, helpers, and logic actions within the CKAN codebase, improving both functionality and security.
portalspythondatadata-catalogdbpedia
mwahlroos/libcoll-c
Nov 2019 - May 2024
Contributions:28 pushes, 9 branches in 4 years 6 months
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