Mariusz Gronczewski
System Administrator
Warsaw, Masovian Voivodeship, Poland
Summary
👤
Senior🎓
Top SchoolMariusz Gronczewski is a seasoned System Administrator with 16 years of hands-on experience designing and running large-scale Linux infrastructure across Debian/CentOS environments. He manages 500+ machines, builds Puppet-based orchestration, and operates HA clusters for Ceph, Cassandra, Elasticsearch, RabbitMQ, MySQL and OpenStack while handling complex networking (Brocade/Cisco/BIRD with OSPF/ECMP+BGP). Skilled in automation and systems tooling, he writes production utilities in Go, Perl and shell, and deploys software load-balancing and caching stacks (HAProxy, Varnish/ESI). His background spans virtualisation (Proxmox/KVM), mail/web systems, VPNs, firewalls, traffic shaping and deep packet/app-layer debugging with tools like strace/sysdig. Based in Warsaw, he combines low-level network expertise with practical orchestration and a penchant for building bespoke sysadmin tooling.
16 years of coding experience
3 years of employment as a software developer
Wyższa Szkoła Informatyki Stosowanej i Zarządzania WIT w Warszawie
English
Github Skills (200)
opensearch10
interpreter10
scheduling10
automation10
command-line-tool10
influxdb10
puppet10
init10
redis-client10
collectd10
argparse10
command-line-parser10
file-sharing10
vagrant10
home-automation10
Programming languages (23)
Github contributions (5)
XANi/rss2torrent
Mar 2011 - Jan 2016
Contributions:13 commits, 6 pushes in 4 years 10 months
XANi/config
Dec 2010 - Jan 2023
Contributions:1764 commits, 855 pushes, 1 branch in 12 years 2 months
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