Software Engineer, Core Network Engineering

This team is responsible for ensuring networking is never the bottleneck to model training efficiency, cluster reliability, or fleet expansion. They design and operate the systems that provide predictable, high-throughput, low-latency connectivity across some of the world's most advanced AI infrastructure.

About the Role

We're looking for engineers to help build and operate the networking foundation behind OpenAI's frontier AI systems.

Depending on your background and area of focus, you may work across host networking, datacenter fabrics, or global WAN infrastructure. The problems span low-level systems software, distributed infrastructure, protocol readiness, observability, performance engineering, automation, and large-scale network operations.

You'll work on systems where microseconds of latency, tail performance, and network reliability directly impact model training efficiency and production serving performance.

This role is ideal for engineers who enjoy operating close to the hardware/software boundary and solving performance-critical infrastructure problems at massive scale.

In this role, you will:

• Design, build, and operate networking systems that support large-scale AI training and inference infrastructure
• Improve performance, reliability, and scalability across host networking, datacenter fabrics, and WAN systems
• Develop automation for provisioning, configuration management, validation, upgrades, and lifecycle management of networking infrastructure
• Build tooling and observability systems for network health, performance analysis, debugging, and automated remediation
• Optimize network performance across technologies such as RDMA, RoCE, InfiniBand, Ethernet, and high-performance GPU interconnects
• Define and operationalize networking protocols, readiness criteria, and continuous validation systems
• Partner closely with compute, storage, hardware, and infrastructure teams to ensure networking scales predictably with fleet growth
• Contribute to architecture decisions around topology design, capacity planning, failure domains, and network reliability
• Diagnose complex distributed systems and networking issues across large heterogeneous compute environments

• Have experience building or operating large-scale networking or distributed systems infrastructure
• Are comfortable working close to the hardware/software boundary
• Have experience with Linux networking, kernel systems, NICs, RDMA, or performance-sensitive infrastructure software
• Have worked with high-performance networking technologies such as InfiniBand, RoCE, DPDK, or large-scale Ethernet fabrics
• Have experience with datacenter networking, WAN systems, or host networking stacks
• Enjoy debugging complex systems and performance bottlenecks across multiple layers of the stack
• Are comfortable writing production software in languages such as C++, Python, or Go
• Have strong systems fundamentals across networking, operating systems, distributed systems, or infrastructure engineering
• Are motivated by building infrastructure that directly accelerates frontier AI research and deployment

OpenAI is an AI research and deployment company dedicated to ensuring that general-purpose artificial intelligence benefits all of humanity. We push the boundaries of the capabilities of AI systems and seek to safely deploy them to the world through our products. AI is an extremely powerful tool that must be created with safety and human needs at its core, and to achieve our mission, we must encompass and value the many different perspectives, voices, and experiences that form the full spectrum of humanity., At OpenAI, we believe artificial intelligence has the potential to help people solve immense global challenges, and we want the upside of AI to be widely shared. Join us in shaping the future of technology.