Software Engineer (Network, C++)

• As a Software Engineer on the Colossus Networking team, you will develop the core networking software that maximizes the performance and reliability of our datacenter fabric
• Your work will directly impact training efficiency, model convergence, and the speed at which we can push the frontier of AI
• Our engineers own the full lifecycle of their software — from design and implementation to deployment, monitoring, and iteration based on real-world performance at scale
• You will solve hard problems in distributed systems, high-performance networking, and real-time control of one of the largest AI supercomputers on Earth
• Develop routing and traffic-engineering algorithms for the Colossus high-performance datacenter network
• Develop highly reliable, real-time software designed to run on the switches that form the backbone of 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 both 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

Benefits

• Health and wellness: Comprehensive health insurance including medical, dental, vision, and disability coverage
• Life and family: Life and AD&D insurance and fertility benefits to ensure our team’s well-being and peace of mind
• Flexible vacation: We work hard but avoid burn out. Take time off when you need it
• Visa sponsorship: We support international talent with visa sponsorship to join our team
• 401(k) plan: Retirement savings plan to secure your financial future

• Bachelor’s degree in computer science, engineering, math, or a related technical discipline; OR 2+ years of professional software development experience in lieu of a degree
• Strong development experience in C or C++
• Excellent written and verbal communication skills
• Deep knowledge of networking protocols (UDP, TCP/IP, RDMA, etc.), distributed systems, and large-scale datacenter fabrics
• Experience developing, debugging, and deploying software that runs at scale in real-world systems
• Background in real-time systems, high-performance computing, low-latency networking, or resource-constrained environments
• Experience with security considerations in large-scale distributed systems
• Ability to thrive in a fast-paced, dynamic environment with evolving requirements
• Strong professional experience writing high-performance C/C++ in production environments
• Must be willing to work extended hours and weekends as needed
• Creative problem-solving ability with exceptional analytical skills and strong engineering fundamentals