Andreas Granig
Founder & CEO at Sipfront
Vienna, Austria
Summary
🤩
Rockstar🎓
Top SchoolAndreas Granig is a telecom-focused founder and engineering leader with 20+ years building and operating large-scale real-time communication platforms, now leading Sipfront as Founder & CEO from Vienna. He combines deep hands-on SIP/back-end expertise—demonstrated by long-running contributions to flagship open-source SIP servers OpenSIPS and Kamailio—with product and corporate integration experience gained during the ALE acquisition of Sipwise. Andreas has repeatedly scaled systems from lab proofs to 100k-user services, improving database robustness, fixing critical protocol parsing bugs, and adding proxy Path header handling to real-world stacks. Equally comfortable in code and boardroom, he leverages a background in network and systems engineering to automate telecom testing and ship resilient cloud PBX solutions. An unconventional detail: he once financed a game-streaming infrastructure on the side for equity, showing a pragmatic blend of engineering, ops and entrepreneurial risk-taking.
20 years of coding experience
16 years of employment as a software developer
DI(FH) IT/IT-Marketing, DI(FH) IT/IT-Marketing at FH CAMPUS 02
German, English
Github Skills (21)
opensips10
kamailio10
headers10
mysql10
proxy10
proxy-server10
c1110
sip10
c1710
sips10
parsing10
sql10
database-design10
proxies10
parse10
Programming languages (9)
Github contributions (5)
kamailio/kamailio
Sep 2005 - Nov 2021
Kamailio - The Open Source SIP Server for large VoIP and real-time communication platforms -
Role in this project:
Backend Developer / Database Engineer
Backend Developer / Database EngineerContributions:5 reviews, 7 commits, 8 PRs in 16 years 5 months
Contributions summary:Andreas primarily focused on database-related changes within the Kamailio SIP server. They added functionality to allow database backends to store auxiliary data and refactored the MySQL result handling to enable nested queries. Further contributions included improving the robustness of the db_sqlite module by introducing a busy timeout parameter to enhance concurrency, especially during module loading and WAL setup. These modifications indicate a focus on database performance, reliability, and integration within the VoIP platform.
voltesip-serverkamailiofreeswitchchat
OpenSIPS/opensips
Jan 2006 - Aug 2007
OpenSIPS is a GPL implementation of a multi-functionality SIP Server that targets to deliver a high-level technical solution (performance, security and quality) to be used in professional SIP server platforms.
Role in this project:Back-end Developer
Back-end DeveloperContributions:12 commits in 1 year 6 months
Contributions summary:Andreas primarily contributed to fixing bugs and improving the OpenSIPS SIP server's functionality. Their work involved correcting issues in parsing SIP headers, such as the `lr-parameter` and `Supported` header, and fixing insertion of the Route header. They also developed a new module for handling Path headers in intermediate proxies, improving the server's ability to process and route SIP requests. Furthermore, the user fixed memory leaks and improved the code's stability.
professionalsip-servergplsecurityhigh-level
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.