Christopher Rienzo
VP Of Engineering at SignalWire
North Carolina, United States
Summary
🤩
Rockstar🎓
Top SchoolChristopher Rienzo is a remote-first VP of Engineering with 17 years of experience building and leading voice and telecom software teams, currently scaling SignalWire’s engineering organization. He moved complex products from legacy TDM systems to open-source VoIP stacks across roles at Grasshopper, Citrix, LogMeIn and Genesys, blending hands-on C/C++/Lua engineering with strategic leadership. Christopher has deep telecom protocol expertise and a history of stabilizing and extending FreeSWITCH and Sofia-SIP modules, contributing fixes and new features that improved reliability and audio/grammar support in widely used open-source telecom projects. Comfortable at the intersection of product and infrastructure, he drives pragmatic architecture and delivery for high-availability voice systems. Based in North Carolina, he pairs systems-level engineering discipline with a knack for shepherding open-source collaborations that reduce operational risk.
16 years of coding experience
18 years of employment as a software developer
BS Computer Engineering, BS Computer Engineering at University at Buffalo
Github Skills (21)
debug10
sipjs10
audio-processing10
c-programming10
c1110
network-programming10
sip10
c1710
sips10
sipp10
freeswitch10
open-source9
logging9
voicemail8
ssml8
Programming languages (7)
Github contributions (5)
signalwire/freeswitch
Apr 2014 - Aug 2022
FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a versatile software implementation that runs on any commodity hardware. From a Raspberry PI to a multi-core server, FreeSWITCH can unlock the telecommunications potential of any device.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:106 reviews, 252 commits, 44 PRs in 8 years 5 months
Contributions summary:Christopher primarily contributed to the `mod_unimrcp` module, which integrates with the FreeSWITCH telecom platform. Their contributions focused on implementing new features, such as adding support for host byte ordered L16 audio and expanding grammar capabilities. The user also addressed several critical issues including fixing core dumps related to the module and improving overall stability and functionality.
telecomproprietarytelecommunicationswebrtccommodity-hardware
freeswitch/sofia-sip
Sep 2013 - Sep 2022
Sofia-SIP is an open-source SIP User-Agent library, compliant with the IETF RFC3261 specification.
Role in this project:Back-end Developer
Back-end DeveloperContributions:11 reviews, 9 commits, 5 PRs in 9 years 1 month
Contributions summary:Christopher primarily contributed to the `sofia-sip` library, focusing on bug fixes and enhancements. Their work involved correcting typos, resolving dead assignments, and adding new cause codes and phrases for SIP status messages. The user also addressed logging issues, optimized message handling, and made adjustments to the connection reuse functionality.
agentkamailiocompliantspecificationfreeswitch
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