Karsten Horsmann
IT Spezialist at DB Systel GmbH
Hanover, Lower Saxony, Germany
Summary
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SeniorKarsten Horsmann is an experienced DevOps and VoIP specialist with over a decade of hands-on engineering in Linux/Unix systems, telecommunications, and cloud-native automation. He has designed and deployed carrier-grade SIP infrastructures, session border controllers and cloud ACD/dialer platforms using FreeSWITCH, Kamailio/OpenSIPS, and IaC tools like Puppet, Ansible and Terraform. Comfortable across the stack—from kernel-level networking and SIP signaling to backoffice services (Postfix, MySQL, OpenLDAP)—he pairs deep protocol knowledge with pragmatic operational skills (Nagios/Icinga, Zabbix, PF/IPTables). Currently driving AWS, Kafka and Terraform initiatives at DB Systel, he blends consulting and project leadership with a focus on business outcomes. Fluent in German and proficient in English, he’s as likely to script a complex Python automation as to tune RTP performance under production load.
12 years of coding experience
16 years of employment as a software developer
German, English
Github Skills (152)
asterisk10
sctp10
proxy10
border10
chat10
freepbx10
kamailio10
sip-server10
telephony10
sdp10
voip10
iot10
webrtc10
sip10
raspberry10
Programming languages (13)
Github contributions (5)
khorsmann/dot-config
Oct 2018 - Feb 2025
Contributions:45 pushes, 1 branch in 6 years 5 months
khorsmann/freeswitch-snmp-cacti
Oct 2015 - Jul 2017
Contributions:7 commits, 6 pushes, 1 branch in 1 year 9 months
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