Stefan Birrer
CTO & Co-Founder at Kealu Inc.
Miami Beach, Florida, United States
Summary
👤
Senior🎓
Top SchoolStefan Birrer is a CTO and serial founder with a PhD in distributed systems and 25+ years of experience building high-performance, real-time video platforms and kernel-native server infrastructure. He co-founded Phenix, scaling it to enterprise-grade reliability that supported hundreds of thousands of concurrent viewers with near-zero latency and sustained double-digit annual revenue growth. Equally comfortable in hands-on systems design and executive leadership, he has grown engineering teams from startups to 65+ professionals while driving innovations like autonomous scaling, time-shift replay, SSAI/DRM pipelines, and cloud cost optimizations. Today he is re-architecting server infrastructure at Kealu to solve universal scalability limits from the kernel up, targeting real-time workloads across streaming, AI, and finance. His background blends deep research (peer-reviewed routing and overlay publications) with practical product pivots that generated substantial customer revenue, and he retains a knack for translating kernel- and protocol-level ideas into commercial platforms. Based in Miami Beach, he seeks advisory roles and partnerships that push the limits of distributed, low-latency systems.
10 years of coding experience
18 years of employment as a software developer
PhD Computer Science, PhD Computer Science at Northwestern UniversityBSc Computer Science, BSc Computer Science at FH Aargau
English, German
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (73)
token-authetication10
linux10
sdk10
webtransport10
video-chat10
nodejs10
webrtc10
channel10
javascript9
scalable9
js9
realtime9
windows9
live-streaming9
database-driver9
Programming languages (6)
Github contributions (5)
PhenixRTS/WebSDK
Jun 2016 - Nov 2022
Web SDK for PCast™ enables massively scalable real-time video applications
Contributions:15 releases, 280 commits, 301 pushes in 6 years 5 months
scalablerealtimeweb-sdkshaka-playerwebtransport
PhenixRTS/RTC
Jun 2016 - Aug 2020
Real-time communications (RTC) adapter for web browsers
Contributions:22 commits, 2 PRs, 36 pushes in 4 years 2 months
rtcbrowserscommunicationswebrtcadapter
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