Sr. Software Engineer, Network (C++)
xAI · Palo Alto, CA; Seattle, WA
About this role
**SpaceXSI — Sr. Software Engineer, Network (C++)** SpaceX was founded on the belief that humanity’s future is more exciting when we’re exploring the stars. SpaceXSI is building Super Intelligence to help humanity understand the universe—developing the full stack from Colossus supercomputers to Grok models and applications. As a Software Engineer on the **Colossus Networking** team, you’ll develop core networking software that maximizes performance and reliability of our datacenter fabric, directly impacting training efficiency, model convergence, and time-to-innovation. --- **Responsibilities** - Develop routing and traffic-engineering algorithms for the Colossus high-performance datacenter network - Build highly reliable, real-time software designed to run on switches powering our low-latency, high-bandwidth AI training fabric - Participate in and lead architecture, design, and code reviews - Develop prototypes and run experiments to validate key design decisions at small and full-cluster scale - Build tools for software development, deployment, data analysis, visualization, and testing across virtualized environments, hardware-in-the-loop setups, and live production clusters - Deploy reliable software updates through continuous integration and release systems with rigorous testing and monitoring --- **Basic Qualifications** - Bachelor’s degree in computer science, engineering, math, or a technical discipline - 5+ years of professional software development experience in lieu of a degree - Development experience in **C** or **C++** --- **Preferred Skills and Experience** - Strong professional experience writing high-performance C/C++ in production environments - Experience developing, debugging, and deploying software that runs at scale in real-world systems - Deep knowledge of networking protocols (UDP, TCP/IP, RDMA, etc.), distributed systems, and large-scale datacenter fabrics - Background in real-time systems, high-performance computing, low-latency networking, or resource-constrained environments - Creative problem-solving with exceptional analytical skills and strong engineering fundamentals - Excellent written and verbal communication skills - Ability to thrive in a fast-paced environment with evolving requirements - Experience with security considerations in large-scale distributed systems --- **Compensation and Benefits** - **$200,000 – $375,000 USD** - Equity and comprehensive benefits including medical, vision, and dental coverage; 401(k); disability and life insurance; and additional discounts/perks *SpaceXSI is an equal opportunity employer.*
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