Tobias Schlager
Software Engineer at VIER
Ettlingen, Baden-Württemberg, Germany
Summary
👤
Senior🎓
Top SchoolTobias Schlager is a senior backend engineer with 15 years building high-availability media servers and signalling gateways, specializing in Erlang and C for telecommunication systems. He has designed, implemented and operated mTCA- and cPCI-based media resource functions and gateways (SIP, RTP, ISDN, iTDM) across small expert teams, currently at VIER after a long tenure at Lindenbaum. Deep protocol and network expertise is paired with hands-on low-level work—IPMI, JNI, H.110 and real-time audio/video processing—so he moves seamlessly from system design to performance tuning. An active contributor to Erlang SIP tooling (NetComposer/nksip), he focuses on robustness: type specs, dialyzer fixes and safer binary handling. Based in Ettlingen, Germany, he brings research-rooted rigor from his university work on multicast protocols to production telecom software.
15 years of coding experience
18 years of employment as a software developer
Diplom-Informatiker, Informatik, Diplom-Informatiker, Informatik at Universität Karlsruhe (TH)
German, English
Github Skills (11)
typespec10
spec10
sips10
sipjs10
erlang10
sipp10
specification10
sip10
dialyzer9
testing8
documentation7
Programming languages (9)
Github contributions (5)
NetComposer/nksip
Apr 2015 - Apr 2015
Erlang SIP application server
Role in this project:
Back-end Developer
Back-end DeveloperContributions:8 commits, 4 PRs, 2 comments in 1 day
Contributions summary:Tobias primarily contributed to the Erlang SIP application server, focusing on bug fixes and code improvements. Their work included fixing dialyzer warnings, correcting type specifications, and improving the handling of options and reason codes for binary values. They also addressed documentation issues and suppressed specific timeout messages within the application.
siperlangsdpapplication-server
lindenbaum/lbm_rtp_proxy
May 2019 - Jan 2021
Contributions:4 commits, 6 pushes, 1 branch in 1 year 8 months
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