Staff Systems Software Engineer, Crusoe Energy Systems

• Deep Systems Experience: 8+ years of systems programming experience, with at least 5 years focused specifically on Linux Kernel development
• Profound Kernel Internals Knowledge: Expert understanding of the VFS, block layer, task scheduling, and interrupt handling
• C & Assembly Mastery: Expert-level mastery of C and the ability to read/debug architecture-specific assembly (x86_64, ARM64)
• Virtualization Mastery: Extensive experience with KVM internals and the complex interaction between the hypervisor and the host kernel
• Advanced Memory Management: Deep knowledge of SLAB/SLUB allocators, page table management, and NUMA-aware memory allocation strategies
• EBPF Expertise: Proficiency in using eBPF for both observability and networking/security (XDP) applications
• Analytical Leadership: The ability to establish gold-standard performance metrics for kernel-level operations that directly impact AI training times

Desirable

• Crusoe is seeking a Staff Linux Kernel Engineer to serve as the primary technical authority for our operating system and hardware-interface layer
• This is a "heavy-lifting" engineering role designed for someone who views the Linux kernel not just as an OS, but as a programmable substrate for AI performance
• As a Staff Engineer, you will own the most critical paths of our compute stack
• You will be responsible for upstream-quality development, custom kernel modules, and the low-level orchestration of memory and I/O that allows our GPU clusters to operate at the theoretical limits of the silicon
• You will bridge the gap between baremetal hardware and the virtualization layer, ensuring that Crusoe's "Metal-as-a-Service" offering is the most performant in the industry
• Core Kernel Architecture: Architect and implement enhancements to the Linux kernel’s memory management (MM), process scheduler, and I/O stack specifically for high-tenancy AI/HPC workloads
• Module & Driver Development: Develop and maintain out-of-tree kernel modules and drivers that manage high-speed interconnects (NVSwitch/NVLink) and hardware accelerators
• Upstream Contribution: Identify, backport, and contribute fixes and features to the mainline Linux kernel, ensuring Crusoe remains at the forefront of kernel innovation
• PCIe & IOMMU Interfacing: Lead the implementation of VFIO and SR-IOV strategies to provide secure, near-zero-latency hardware passthrough to virtualized environments
• DMA & GPUDirect RDMA Optimization: Optimize DMA mapping and memory pinning strategies to facilitate high-speed data transfers between NICs and GPUs without CPU intervention
• Hardware-Software Co-Design: Work with hardware vendors to debug and influence the design of firmware and silicon-level features that impact kernel stability and performance
• Advanced Profiling & Observability: Utilize eBPF, ftrace, and perf to build deep observability into kernel-space bottlenecks and latency spikes
• Deep-System Debugging: Lead investigations into complex system-level failures, including kernel panics, memory leaks, and non-deterministic hardware behavior
• Technical Mentorship: Lead large-scale architectural shifts and mentor senior engineers on the nuances of systems-level safety and performance