L3 Support Engineer

About Nebius: Nebius is leading a new era in cloud infrastructure for the global AI economy. We are building a full-stack AI cloud platform that supports developers and enterprises from data and model training through to production deployment, without the cost and complexity of building large in-house AI/ML infrastructure. Built by engineers, for engineers. From large-scale GPU orchestration to inference optimization, we own the hard problems across compute, storage, networking and applied AI. Listed on Nasdaq (NBIS) and headquartered in Amsterdam, we have a global footprint with R&D hubs across Europe, the UK, North America and Israel. Our team of 1,500+ includes hundreds of engineers with deep expertise across hardware, software and AI R&D. The role We are building our L3 Support Line from scratch to serve as the datacenter center of expertise for servers, firmware (BIOS/BMC), and deep Linux diagnostics across Europe and the US. This is a senior technical role focused on deep investigations, cross-site pattern detection, and driving permanent fixes with R&D and ODM vendors. You will turn complex incidents into scalable solutions and elevate L1/L2 capabilities through strong technical enablement. You’re welcome to work in our DC in Mäntsälä, Finland. Your responsibilities will include: Deep Technical Investigation (Primary Focus) • Lead root cause analysis beyond L2 depth (GPU failures, firmware issues, Linux-level faults, HW/SW interactions). • Detect recurring patterns across sites and convert findings into durable fixes. • Own technical workstreams during high-severity incidents. Vendor & R&D Collaboration • Build evidence packs and drive escalations with ODM and R&D. • Push for firmware, component, and platform-level resolutions. • Track outcomes and ensure knowledge flows back to operations. Firmware & Platform Readiness (BIOS/BMC) • Support validation and rollout of firmware updates (risk assessment, staging, rollback planning). • Help operationalize platform standards across datacenters. Knowledge & Enablement • Create scalable runbooks, troubleshooting guides, and error catalogs. • Turn investigations into playbooks that elevate L1/L2 teams. Hands-on Support (As Needed) • Travel to datacenters for complex troubleshooting, new platform readiness, or incident containment. We expect you to have: • Strong hands-on experience with datacenter servers and deep Linux troubleshooting. • Ability to diagnose across hardware, BIOS/BMC firmware, and Linux (logs, drivers, storage basics, performance triage). • Structured incident response experience and clear communication under pressure. • Experience driving evidence-based escalations with vendors/R&D. • Fluent English (written and spoken). It will be an added bonus if you have: • Strong familiarity with GPU server platforms and tooling (for example: nvidia-smi, dcgmi, Linux logs correlation). • Experience with ipmitool and Redfish workflows, firmware lifecycle, and staged rollouts. • Scripting skills (bash and basic Python) for log collection, triage automation, and simple reliability analysis. • Exposure to OCP -based platforms and ODM manufacturing ecosystems. • Experience supporting enterprise bare metal customers under contractual SLAs. Benefits & Perks: • Competitive compensation • Career growth and learning opportunities • Flexibility and ownership • Collaborative and innovative culture • Opportunity to work on impactful AI projects • International environment and talented teams What's it like to work at Nebius: Fast moving - Bold thinking - Constant growth - Meaningful impact - Trust and real ownership - Opportunity to shape the future of AI Equal Opportunity Statement: Nebius is an equal opportunity employer. We are committed to