HPC Performance Engineer

Core Weave is The Essential Cloud for AI™. Built for pioneers by pioneers, Core Weave delivers a platform of technology, tools, and teams that enables innovators to build and scale AI with confidence. Trusted by leading AI labs, startups, and global enterprises, Core Weave combines superior infrastructure performance with deep technical expertise to accelerate breakthroughs and turn compute into capability. Founded in 2017, Core Weave became a publicly traded company (Nasdaq: CRWV) in March 2025.

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Core Weave is seeking a highly skilled and motivated HPC Performance Engineer to join our HAVOCK Team, reporting into the Manager of Systems Engineering. In this role, you will play a crucial part in the design, development, and optimization of our bare‑metal systems from POST through joining a Kubernetes cluster. The team's primary responsibilities include maintaining a custom Linux kernel, various OS images (Ubuntu-based), the virtualization stack (kubevirt/qemu/vfio), and the container/pod runtime stack (containerd/nydus/kubelet).

You will collaborate closely with cross‑functional teams, up‑stack engineering teams, and stakeholders to ensure our low‑level software stack is performant in the context of hardware updates; and providing data, metrics, dashboards, and analysis to substantiate performance assertions.

Kernel Hardware Acceleration Virtualization Operating Systems Containerization Kubelet

• Python, Go, bash/sh, C
• Prometheus, Victoria Metrics, Grafana
• Linux Kernel (custom build), Ubuntu
• Intel/AMD/ARM CPUs, Nvidia GPUs, DPUs, Infiniband and Ethernet NICs
• Docker, kubernetes (k8s), Kube Virt, containerd, kubelet

• Develop and maintain tools for establishing systems performance baselines
• Develop and maintain performance regression analysis testing automation
• Design and maintain performance regression test pipelines for HPC workloads
• Debug and Tune fabric‑level performance to ensure low‑latency high throughput configurations
• Development of telemetry for performance analysis across distributed clusters of servers
• Triage and fix performance issues in Linux
• Collect data, produce metrics and visualizations that communicate performance information compared to benchmarks; this data should lead to appropriate business decisions and toward greater automation that improves customer experience in relation to performance
• Define Linux and OS requirements, specifications, and system architecture in relation to systems performance, in collaboration with cross‑functional teams. Along with these responsibilities there will also be cross team collaboration to triage and resolve bottlenecks

• 5+ years of professional experience in Systems/HPC Performance Engineering, Benchmarking, and/or Validation.
• Strong experience with MPI workloads and distributed system performance analysis
• Familiarity with RoCE, Infini Band, and GPUDirect/Data Direct I/O, NUMA, etc in HPC workloads
• Hands‑on use of public HPC benchmarks (HPCC, HPL, OSU, MLPerf‑HPC, STREAM, IO500)
• Extensive, deep experience in Linux internals
• Fluency with a programming language geared toward automation (Python preferred, but others possible)
• Experience writing robust, testable code
• Experience diagnosing and fixing systems performance issues
• Experiencing with implementing automation testing
• Ability to effectively prioritize and communicate proposed features and fixes in a remote‑employee environment
• Strong passion for automation, with a commitment to automating processes comprehensively
• Excellent documentation skills and attention to detail
• Strong analytical and problem‑solving abilities

• Familiarity with QA/QE best practices
• Familiarity with Golang
• Opinions about software version control and team collaboration
• Experience working in Cloud environments
  
  Experience as a software engineer writing large‑scale applications
• Experience in open‑source community software development
• Experience with machine learning is a huge bonus

Wondering if you’re a good fit? We believe in investing in our people, and value candidates who can bring their own diversified experiences to our teams – even if you aren't a 100% skill or experience…