Sr. Software Engineer, Media
xAI · Palo Alto, California
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SpaceX was founded under the belief that a future where humanity is out exploring the stars is fundamentally more exciting than one where we are not. Today, SpaceX is actively developing the technologies to make this possible, with the ultimate goal of making life multiplanetary and expanding consciousness to the stars.
SpaceXSI is building Super Intelligence to help humanity understand the universe. Our teams are building the full Super Intelligence stack: from our Colossus supercomputers, to Grok models, to our suite of applications, including Grok Bot, Grok Build, Grok Imagine, Grok Voice, and X. We're creating a powerful flywheel where more compute trains better models, better models power more useful products, and what we learn from people using those products shapes what we build next.
SENIOR SOFTWARE ENGINEER, MEDIA
We’re looking for exceptional media engineers to join us on a new project: deeply integrating SpaceXSI's advanced AI infrastructure into a platform used by around 600 million users every month. We’re bringing SpaceXSI's technology stack to transform the video product experience - video playback, live streaming, Spaces, audio/video calls, and more.
A major focus of this work is real-time communication: building audio and video calling that rivals the best conferencing products in the world (think Google Meet and Zoom), from crisp one-on-one calls to large multi-party conversations, and making it smarter with AI. You’ll own systems where every millisecond of latency and every dropped frame is felt by users, and you’ll ship them at a scale few teams ever reach.
This is your chance to contribute in a major way while leveraging all of the powerful AI tools and talented colleagues at SpaceXSI.
RESPONSIBILITIES
- Build the next generation of large-scale video services on X, spanning on-demand playback, live streaming, Spaces, and real-time audio/video calls
- Design, build, and scale real-time audio/video calling infrastructure, including 1:1 and multi-party calls, using WebRTC and related real-time protocols (RTP/RTCP, SRTP, ICE/STUN/TURN)
- Architect and operate media servers (SFU/MCU) that route, mix, and forward streams for many concurrent participants, and scale them globally to handle huge numbers of simultaneous calls
- Deliver low-latency, resilient media under real-world network conditions through congestion control, adaptive bitrate, simulcast/SVC, jitter buffering, packet-loss recovery (FEC, NACK/RTX), and fast reconnection
- Work hands-on with audio and video codecs (e.g. Opus, H.264, VP8/VP9, AV1) and hardware acceleration to balance quality, latency, bandwidth, and battery across devices
- Build core calling features such as screen sharing, group calls, call recording, and seamless switching across iOS, Android, and web
- Bring AI into the call experience: real-time transcription and captions, live translation, noise suppression and echo cancellation, video enhancement, and other intelligent in-call features powered by SpaceXSI models
- Contribute to and rebuild core media processing pipelines in high-performance languages (Rust/C++)
- Obsess over every millisecond and pixel, ensuring end-to-end media quality and performance at scale across a rich suite of products and user platforms; instrument call quality metrics (latency, jitter, packet loss, freeze rate, MOS) and use them to drive continuous improvement
BASIC QUALIFICATIONS
- 5+ years of experience building high-performance media processing pipelines
PREFERRED QUALIFICATIONS
- Proficient in high-performance Rust or C++
- In-depth knowledge and experience building high-performance media processing pipelines
- Hands-on experience building real-time audio/video communication products (e.g. video conferencing, VoIP, or live interactive streaming) at scale
- Deep familiarity with WebRTC internals and real-time networking: RTP/RTCP, ICE/STUN/TURN, congestion control (e.g. GCC, transport-wide CC), and bandwidth estimation
- Experience designing, deploying, or scaling SFU/MCU media servers for multi-party calls with many concurrent sessions
- Strong understanding of audio/video codecs (Opus, H.264, VP8/VP9, AV1), encoding/decoding trade-offs, and hardware acceleration on mobile and desktop
- Experience improving call quality and resilience under poor network conditions: packet loss, jitter, and bandwidth fluctuation
- Experience with audio processing (echo cancellation, noise suppression, automatic gain control) or integrating ML models into real-time media, such as live transcription, translation, or video enhancement
- Obsessed with media quality, performance, and product experience
COMPENSATION AND BENEFITS
$180,000 - $330,000 USD
Base salary is just one part of our total rewards package at SpaceXSI, which also includes equity, comprehensive medical, vision, and dental coverage, access to a 401(k) retirement plan, short & long-term disability insurance, life insurance, and various other discounts and perks.
SpaceXSI is an equal opportunity employer. For details on data processing, view our Recruitment Privacy Notice.
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