Principal Network Engineer

Every day, tens of millions of people come to Roblox to explore, create, play, learn, and connect with friends in 3D immersive digital experiences– all created by our global community of developers and creators. At Roblox, we’re building the tools and platform that empower our community to bring any experience that they can imagine to life. Our vision is to reimagine the way people come together, from anywhere in the world, and on any device. We’re on a mission to connect a billion people with optimism and civility, and looking for amazing talent to help us get there. A career at Roblox means you’ll be working to shape the future of human interaction, solving unique technical challenges at scale, and helping to create safer, more civil shared experiences for everyone. As a Principal Network Engineer, you will work cross-functionally to plan the growth of Roblox’s global production network to support rapid user growth. In this role, you are responsible for Engineering and Architecture of Roblox Backbone and Edge Network. You will ensure that we are making the right investments with our global expansion to provide a great experience for all our users worldwide. We run services and a hosting platform with some unique complexities, so this role is an opportunity for the experienced network engineer to take on new challenges in addition to applying their existing expertise. You Will: Serve as a Principle Engineer for Roblox's Backbone Network. Drive future design, deployment, and operations for Roblox’s large-scale Network Infrastructure. Engage in design, qualification, and validation of new technologies, and ensure new technologies are deployable at scale and are safely operable. Collaborate with the Network Tooling Team to automate workflows and improve telemetry, observability, and alerting. Work with net tools to automate existing workflows and improve our telemetry and alerting framework. Participate in on-call rotation to support the global network inf

Graphcore is a globally recognized leader in Artificial Intelligence computing systems. The company designs advanced semiconductors and data centre hardware that provide the specialized processing power needed to drive AI innovation, while delivering the efficiency required to support its broader adoption. As part of the SoftBank Group, Graphcore is a member of an elite family of companies responsible for some of the world’s most transformative technologies. We are opening a new AI Engineering Campus in Austin, which will play a central role in Graphcore's work building the future of AI computing. RESPONSIBILITIES Responsible for the maintaining all the network fabrics and network topologies operating at peak performance on Graphcore Data centers housing AI server platforms. Collaborate closely with our Network architecture team through all phases of the design and development lifecycle — from concept to deployment — ensuring timely, high-quality, and stable high-speed network fabrics. Primary support of deployed internal fabrics in our AI Datacenters. Direct escalation for Hardware, Link and, Performance issues on network fabrics. Escalation support for customer network fabrics (aligned to reference arch.) Triage day-to-day network topologies (scale-up, scale-out, and front-end networks) issues of Fabrics deployed in Graphcore Datacenters. REQUIREMENTS Bachelor’s, master’s degree or equivalent experience in Network Engineering/Security, Information Technology, Computer Science, Computer engineering, or a related field. 9+ years of hands-on experience in network engineering and 3+ years supporting networking on AI or Hyperscale Datacenters. Knowledge of Remote Direct Memory Access (RDMA) and its implementations, specifically ROCEv2 or InfiniBand Knowledge of Lossless network – Experience with congestion control and lossless Ethernet technologies including PDF, ECN and DCQCN. Versed in High-Bandwidth networ

Leidos is seeking a Principal Network Engineer – Wireless to lead engineering, deployment, and modernization of a large-scale, geographically distributed enterprise wireless network supporting a Department of Defense environment. The engineer will provide technical leadership for Aruba wireless architecture, RF performance, secure network access, integration, troubleshooting, and transition to operations. The environment includes Aruba AOS 10, Aruba Central On-Premises, distributed Aruba ClearPass, Cisco ISE coexistence, certificate-based 802.1X authentication, Comply-to-Connect enforcement, wireless intrusion detection and prevention, and enterprise monitoring. The engineer will collaborate with network, identity, cybersecurity, and operations teams to deliver secure, reliable wireless services at scale. Clearance Requirements Active DoD Secret clearance; ability to obtain additional access if required by the assigned environment. Primary Responsibilities Wireless Architecture and Deployment Design, deploy, configure, and optimize enterprise Aruba wireless infrastructure, including access points, gateways, management platforms, redundancy, and lifecycle upgrades. Engineer and sustain Aruba Central On-Premises and AOS 10 configurations, provisioning workflows, high availability, and enterprise configuration standards. Lead RF design, site surveys, channel and power planning, capacity analysis, roaming optimization, and wireless QoS for voice and mission-critical applications. Network Access Control and Security Integrate Aruba ClearPass and Cisco ISE with 802.1X/EAP-TLS, RADIUS, certificate-based authentication, endpoint profiling, and Comply-to-Connect policies. Engineer wireless security controls, including network segmentation, WPA3, WIDS/WIPS, secure guest access, an

Every day, tens of millions of people come to Roblox to explore, create, play, learn, and connect with friends in 3D immersive digital experiences– all created by our global community of developers and creators. At Roblox, we’re building the tools and platform that empower our community to bring any experience that they can imagine to life. Our vision is to reimagine the way people come together, from anywhere in the world, and on any device. We’re on a mission to connect a billion people with optimism and civility, and looking for amazing talent to help us get there. A career at Roblox means you’ll be working to shape the future of human interaction, solving unique technical challenges at scale, and helping to create safer, more civil shared experiences for everyone. As a Principal Network Engineer, you will work cross-functionally to plan the growth of Roblox’s global production network to support rapid user growth. In this role, you are responsible for Engineering and Architecture of Roblox Backbone and Edge Network. You will ensure that we are making the right investments with our global expansion to provide a great experience for all our users worldwide. We run services and a hosting platform with some unique complexities, so this role is an opportunity for the experienced network engineer to take on new challenges in addition to applying their existing expertise. You Will: Serve as a Principle Engineer for Roblox's Backbone Network. Drive future design, deployment, and operations for Roblox’s large-scale Network Infrastructure. Engage in design, qualification, and validation of new technologies, and ensure new technologies are deployable at scale and are safely operable. Collaborate with the Network Tooling Team to automate workflows and improve telemetry, observability, and alerting. Work with net tools to automate existing workflows and improve our telemetry and alerting framework. Participate in on-call rotation to support the global netw

Leidos is seeking a Principal Network Engineer specializing in enterprise wireless infrastructure to design, implement, and modernize a large-scale, geographically distributed wireless network environment. The successful candidate will serve as a senior technical engineer responsible for migrating Aruba wireless controllers to a centralized cloud-hosted environment, implementing Aruba Central, improving wireless network resiliency, and standardizing wireless security and access-control capabilities. This position requires extensive experience with Aruba wireless technologies, enterprise networking, wireless security, high availability, and network access control. The engineer will collaborate with cloud, network, cybersecurity, identity management, and monitoring teams to deliver reliable, scalable, and secure wireless infrastructure. The engineer will support architecture, implementation, integration, testing, migration, documentation, and transition to operations while providing technical direction to other engineering personnel. Primary Responsibilities Wireless Architecture and Controller Migration Design, engineer, and implement the migration of existing Aruba wireless controllers to a centralized cloud-hosted infrastructure. Deploy and configure Aruba Central for centralized wireless management, configuration standardization, monitoring, and operational visibility. Develop controller migration strategies, implementation procedures, validation plans, and rollback processes. Standardize NTP configurations across wireless controllers, access points, and supporting network infrastructure. Evaluate and establish wireless deployment standards, including bridge versus tunnel mode and campus versus remote architectures. Develop standardized configurations and deployment playbooks for geographically distri

About us Graphcore is one of the world’s leading innovators in Artificial Intelligence compute. It is developing hardware, software and systems infrastructure that will unlock the next generation of AI breakthroughs and power the widespread adoption of AI solutions across every industry. As part of the SoftBank Group, Graphcore is a member of an elite family of companies responsible for some of the world’s most transformative technologies. Together, they share a bold vision: to enable Artificial Super Intelligence and ensure its benefits are accessible to everyone. Graphcore’s teams are drawn from diverse backgrounds and bring a broad range of skills and perspectives. A melting pot of AI research specialists, silicon designers, software engineers and systems architects, Graphcore enjoys a culture of continuous learning and constant innovation. Job Summary We are seeking a Senior Principal Network Engineer to help design, deploy, and optimize next‑generation AI data center networks. AI training and inference workloads require extremely high bandwidth, deterministic low latency, and zero‑packet‑loss networking environments. In this role, you will partner closely with the Network Architecture Lead to design and scale high‑performance computing (HPC) network fabrics supporting GPU clusters. You will work across hardware, networking, and AI application layers to ensure Graphcore’s large‑scale AI infrastructure operates at peak performance. The ideal candidate brings deep experience operating hyperscale or HPC data center networks and has expertise in high‑speed Ethernet fabrics, RDMA technologies, advanced automation, and telemetry systems. The Team The Data Center Network Engineering team designs and operates the high‑performance network fabrics that power Graphcore’s AI compute platforms. The team collaborates closely with hardware engineering, AI researchers, and infrastructure teams to build scalable networking environments optimized for distributed training and infe