Software Engineer - Network (C++)

About the Company

xAI’s mission is to create AI systems that can accurately understand the universe and aid humanity in its pursuit of knowledge. Our team is small, highly motivated, and focused on engineering excellence, operating with a flat organizational structure where all employees contribute directly to the mission.

Responsibilities

• Develop routing and traffic-engineering algorithms for the Colossus high-performance datacenter network
• Develop highly reliable, real-time software for switches forming the backbone of the AI training fabric
• Participate in and lead architecture, design, and code reviews
• Develop prototypes and run experiments to validate design decisions at scale
• Build tools for software development, deployment, data analysis, and testing
• Deploy reliable software updates through continuous integration and release systems

Requirements

• Bachelor’s degree in computer science, engineering, math, or a related technical discipline, or 2+ years of professional software development experience
• Strong development experience in C or C++
• Willingness to work extended hours and weekends as needed

Preferred Qualifications

• Professional experience writing high-performance C/C++ in production environments
• Experience developing, debugging, and deploying software at scale
• Deep knowledge of networking protocols (UDP, TCP/IP, RDMA, etc.) and distributed systems
• Background in real-time systems, high-performance computing, or low-latency networking
• Experience with security considerations in large-scale distributed systems