Maksym Sobolyev
Developer at Sippy Software, Inc.
New Westminster, British Columbia, Canada
Summary
🤩
Rockstar🎓
Top SchoolMaksym Sobolyev is a seasoned developer with 23 years building high-performance, real-time communication systems specializing in SIP/VoIP, RTP and NAT traversal. He has founded and led companies (Sippy Software) while contributing core modules and long-running maintenance to major open-source SIP projects like Kamailio and OpenSIPS. His deep systems expertise spans FreeBSD platform support, memory-robust C libraries (libucl), and secure RTP work, with notable commits that improved NAT handling, SDP rewriting, and cross-platform compatibility. A FreeBSD committer and frequent contributor to projects such as Cap'n Proto and RRDtool, he blends low-level engineering with pragmatic product thinking. Based in New Westminster, Canada, Maksym pairs academic training in physics/radiophysics with entrepreneurial experience to solve complex distributed-systems and telephony challenges often overlooked by higher-level engineers.
23 years of coding experience
6 years of employment as a software developer
Master of Science, Physics and Radiophysics, Master of Science, Physics and Radiophysics at Taras Shevchenko National University of Kyiv
Github Skills (40)
c-language10
lib10
sipjs10
multiplatform10
freebsd10
memory-management10
time-series10
cross-platform10
c-programming10
sdp10
c1110
data-structure10
sip10
c1710
srtp10
Programming languages (13)
Github contributions (5)
kamailio/kamailio
Apr 2003 - Feb 2016
Kamailio - The Open Source SIP Server for large VoIP and real-time communication platforms -
Role in this project:
Back-end Developer
Back-end DeveloperContributions:211 commits, 3 PRs, 5 comments in 13 years
Contributions summary:Maksym's first commit added a utility function to the `usrloc` module to return contacts for registered users, a function used by the `nathelper` module. Subsequent commits demonstrate expertise in the `nathelper` module, including implementing a portable `memmem()` function, adding functionality to periodically ping UDP users, and integrating features to rewrite IP addresses and ports for NAT traversal in SDPs. The user also implemented various optimizations.
voltesip-serverkamailiofreeswitchchat
OpenSIPS/opensips
Feb 2008 - Oct 2022
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:8 reviews, 182 commits, 62 PRs in 14 years 11 months
Contributions summary:Maksym primarily focused on enhancing the OpenSIPS SIP server's authentication capabilities. They introduced a new parameter to the RADIUS authentication module, addressing issues caused by misbehaving network devices, and corrected the use of the `isflagset()` function for correct flag checking. Additionally, the user made improvements to the SDP handling within the nathelper module, to prevent broken SDPs from being generated by faulty UAs.
professionalsip-servergplsecurityhigh-level
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