[Remote] Senior Principal Back-End Network Engineer, AI Infrastructure

Note: The job is a remote job and is open to candidates in USA. Nscale is a GPU cloud company engineered for AI, providing high-performance infrastructure for AI startups and large enterprises. They are seeking a Principal Network Engineer for AI Infrastructure to lead the technical direction and operational strategy of their AI interconnect networks, focusing on reliability and scalability of Infiniband and RDMA-based network fabrics.ResponsibilitiesOwning the technical direction and operational strategy for Nscale’s AI interconnect networksDesigning, reviewing, and evolving large-scale Infiniband and RoCE fabric architectures to support future growth and workload demandsActing as the senior escalation point for the most complex network incidents, guiding deep technical investigations and systemic fixesDriving cross-team initiatives to improve fabric reliability, performance predictability, and operational maturityDefining standards for hardware configuration, congestion control, routing, firmware lifecycle management, and change safetyPartnering with SRE, Compute Platform, and Network Architecture teams to influence end-to-end system designMentoring senior and mid-level network engineers, raising the bar for operational rigor and technical excellenceDriving measurable improvements in uptime, latency consistency, capacity efficiency, and incident reductionSkills12+ years of experience in network engineering, with deep focus on HPC, AI, or hyperscale data centre networkingExpert-level operational and architectural experience with Infiniband and/or large-scale RoCE fabricsDeep understanding of RDMA internals, congestion management, and fabric-level failure modesStrong expertise in modern data centre routing and control planes (BGP, OSPF, ECMP)Proven ability to debug and resolve cross-layer issues spanning hardware, firmware, kernel, and application communication librariesDemonstrated ability to lead complex technical initiatives across teams without direct authorityA systems-level mindset, balancing performance, reliability, scalability, and operational costExtensive experience with NVIDIA/Mellanox networking platforms in production AI or HPC environmentsDeep familiarity with distributed training frameworks and GPU communication patternsExperience designing network observability systems for high-cardinality, high-throughput environmentsPrior experience influencing platform or infrastructure strategy at scaleBenefitsHighly competitive package (base + equity) with reviews every 12 months.Join the fastest-growing tech startup, your chance to push boundaries, collaborate with brilliant minds, and make your mark on cutting-edge AI.Expect a dynamic progression plan tailored to your ambitions. Grow by trying new things, leading, challenging the status quo, and owning your impact, always with our full support.Human-First Flexibility: We treat you as humans first. 🫶🏽 Our flexible workplace trusts Nscalers to deliver, giving you the autonomy to shape your day around life's moments.Join our thriving remote-first team. Geography is no barrier to impact or connection. We build seamless virtual collaboration, empowering you, wherever you work.Company OverviewNscale builds AI data centers and provides GPU cloud infrastructure that companies use to train, run, and scale large AI models. It was founded in 2024, and is headquartered in London, England, GBR, with a workforce of 201-500 employees. Its website is https://www.nscale.com.