Stephen Blum
CTO at PubNub
San Francisco, California, United States
Summary
🤩
Rockstar🎓
Top SchoolStephen Blum is a seasoned technology leader and CTO based in San Francisco with 17 years of experience building low-latency, highly reliable realtime systems at scale. At PubNub he led engineering for a replicated Multi-POP realtime data stream network serving over a billion devices and helped the company raise $134M through Series E, while accruing 68 patent claims. He blends hands-on full-stack development—contributing to WebRTC SDKs, JavaScript SDKs, and client-side features like OBS subtitle integration—with strategic architecture for telemedicine, online learning, and multiplayer gaming use cases. Earlier roles include founding and exiting a real-time front-end CMS and engineering stints at Microsoft and Loyalize, giving him operator and product-building depth. Known for pragmatic fixes (DNS cache-busting, websocket resiliency) and demo-focused tooling, he prioritizes reliability and developer experience. He combines entrepreneurial grit with deep systems-level expertise in C and realtime networking.
17 years of coding experience
6 years of employment as a software developer
Computer Science, Computer Science at Bellevue CollegeComputer Science, Computer Science at Western Washington UniversityComputer Science, Computer Science at Eastern Oregon University
Stackoverflow
6,688reputation
1.4mreached
167answers
1question
websocket
top-5%
cygwin
top-5%
chat
top-5%
javascript
top-5%
Github Skills (27)
unit-testing10
javascript10
css10
front-end-development10
html10
web-development10
webrtc10
stun9
socket-io9
push-notifications9
ui-design9
websocket9
chat9
cygwin9
speech-recognition9
Programming languages (17)
Github contributions (5)
stephenlb/webrtc-sdk
Jul 2019 - Aug 2020
WebRTC Simple Calling API + Mobile SDK - A simplified approach to RTCPeerConnection for mobile and web video calling apps.
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:9 commits, 9 PRs, 108 pushes in 1 year 1 month
Contributions summary:Stephen contributed to the development of a WebRTC-based SDK, focusing on creating demo applications for video calling. Their work involved modifying HTML and JavaScript files to build a broadcaster and viewer setup. They also integrated PubNub for real-time communication and made adjustments to the STUN server configuration for improved performance.
mobile-sdkapicallingrtcpeerconnectionapproach
stephenlb/twitch-tv-obs-subtitles
Jun 2018 - Apr 2021
Add Subtitles to your Twitch stream! Easy OBS integration.
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:2 reviews, 118 commits, 3 PRs in 2 years 10 months
Contributions summary:Stephen primarily contributed to the front-end of the project, focusing on the implementation of the user interface and the integration of spoken voice commands with the app. Their work involved modifications to JavaScript files (js/app.js, js/request.js, js/subtitles.js, and js/username.js) and the styling of the UI elements using CSS, including the creation of a dashboard. The user also added support for features like subtitle display and color variations in the UI.
twitchobsstreamsubtitles
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