High-Performance Network Software Engineer (C++)

SpaceX Super Intelligence; Seattle (WA); On-site; USD 180,000 - 440,000; Full time

Job summary

SpaceXSI is building a high-performance Colossus networking stack to power Grok and frontier AI models. As a Software Engineer on the Colossus Networking team, you will design core networking software for ultra-low latency and massive bandwidth across hundreds of thousands of GPUs.

You will own the full lifecycle of software from design to deployment, tackle distributed systems challenges, and contribute to the scalability of one of the largest AI supercomputers on Earth.

Qualifications

• Bachelor’s degree in a technical field or 2+ years of software development experience.
• Strong development experience in C or C++ in production environments.
• Deep knowledge of networking, distributed systems, and datacenter fabrics.

Responsibilities

• Develop routing and traffic-engineering algorithms for the Colossus network.
• Develop reliable, real-time software for switches in low-latency fabric.
• Lead architecture reviews and code reviews.

Skills

C/C++

Networking

Distributed systems

Education

Bachelor’s degree in CS/Engineering/Math

Tools

Linux

RDMA

Job description

SpaceXSI is building a high-performance Colossus networking stack to power Grok and frontier AI models. As a Software Engineer on the Colossus Networking team, you will design core networking software for ultra-low latency and massive bandwidth across hundreds of thousands of GPUs.

You will own the full lifecycle of software from design to deployment, tackle distributed systems challenges, and contribute to the scalability of one of the largest AI supercomputers on Earth.