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Crusoe Logo Crusoe · IT - Software Development

Staff/Senior Staff Software Engineer - Cloud Hypervisor R&D

United States, San Francisco 204000.00 - 247000.00 USD / Year · Job Posted February 21, 2026
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Job Description

The Crusoe Cloud Software Development team is seeking a passionate and experienced Senior Staff Software Engineer specializing in Hypervisor Virtualization and Virtualization Research. This pivotal role is critical in the design, development, and optimization of our virtualization technologies, specifically tailored for an all-AI cloud infrastructure. A deep understanding of hypervisor internals, CPU and memory virtualization, I/O virtualization, and performance optimization is essential for developing reliable, high-performance, and secure virtualized environments that power our cutting-edge AI products.

Job Responsibility

  • Design, develop, and optimize core hypervisor components (e.g., KVM, QEMU, or custom solutions) to achieve maximum performance and efficiency for AI workloads
  • Conduct in-depth research into advanced virtualization technologies, exploring novel approaches for isolating and accelerating AI compute, storage, and networking resources
  • Develop and enhance virtual hardware components and device emulation, ensuring optimal performance and compatibility for specialized AI accelerators (e.g., GPUs, DPUs) within the virtualized environment
  • Analyze and enhance the performance of the entire virtualization stack, from the hypervisor to the virtualized guest OS, with a specific focus on optimizing for AI/ML workloads
  • Diagnose and resolve complex system issues within the virtualization layer
  • Conduct thorough code reviews to ensure the highest level of software quality, reliability, and security within the hypervisor and virtualization components
  • Collaborate with other engineering teams, including hardware design, OS development, and AI/ML application teams
  • Provide technical guidance and mentorship to junior engineers

Requirements

  • Proven deep knowledge of hypervisor internals (e.g., KVM, QEMU, Xen, or other bare-metal hypervisors), including CPU virtualization (VT-x/AMD-V), memory virtualization (EPT/NPT, MMU), and I/O virtualization (SR-IOV, virtio)
  • Strong understanding of virtual machine lifecycle, live migration, snapshotting, and fault tolerance mechanisms
  • Experience with Linux kernel internals as they pertain to virtualization, including device drivers, memory management, and scheduling within a virtualized context
  • Familiarity with hardware architectures relevant to virtualization, including CPUs (x86, ARM), GPUs, and Smart NICs/DPUs. Experience with hardware offloads and acceleration for virtualization
  • Demonstrated ability to identify and resolve performance bottlenecks in complex virtualized systems. Experience with profiling tools and techniques
  • Strong debugging skills in complex, distributed systems at the hypervisor and kernel levels

Nice to have

  • Experience with virtualization specifically for AI/ML workloads, including GPU virtualization or direct pass-through
  • Familiarity with container runtimes and their interaction with hypervisors
  • Contributions to open-source virtualization projects
  • Experience with security hardening of hypervisors and virtual machines

What we offer

  • Restricted Stock Units
  • Health insurance package options that include HDHP and PPO, vision, and dental for you and your dependents
  • Employer contributions to HSA accounts
  • Paid Parental Leave
  • Paid life insurance, short-term and long-term disability
  • Teladoc
  • 401(k) with a 100% match up to 4% of salary
  • Generous paid time off and holiday schedule
  • Cell phone reimbursement
  • Tuition reimbursement
  • Subscription to the Calm app
  • MetLife Legal
  • Company paid commuter benefit
  • $300 per month
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