<p>JOB DESCRIPTION</p> <p>About NIO</p> <p>NIO is a pioneer and a leading company in the premium smart electric vehicle market. Founded in November 2014, NIO's mission is to shape a joyful lifestyle. NIO aims to build a community starting with smart electric vehicles to share joy and grow together with users.</p> <p>NIO designs, develops, jointly manufactures and sells premium smart electric vehicles, driving innovations in next-generation technologies in autonomous driving, digital technologies, electric powertrains and batteries. NIO differentiates itself through its continuous technological breakthroughs and innovations, such as its industry-leading battery swapping technologies, Battery as a Service, or BaaS, as well as its proprietary autonomous driving technologies and Autonomous Driving as a Service, or ADaaS.</p> <p>NIO's product portfolio consists of the ES8, a six-seater smart electric flagship SUV, the ES7 (or the EL7), a mid-large five-seater smart electric SUV, the ES6, a five-seater all-round smart electric SUV, the EC7, a five-seater smart electric flagship coupe SUV, the EC6, a five-seater smart electric coupe SUV, the ET7, a smart electric flagship sedan, and the ET5, a mid-size smart electric sedan.</p> <p>Responsibilities</p> <p>Performance Analysis and Optimization</p> <ul> <li>Identify and analyze performance bottlenecks across CPU, memory hierarchy, cache, interconnect, and interrupt subsystems. </li><li>Leverage hardware PMU counters to measure and interpret cycles, instructions, cache misses, branch mispredictions, TLB misses, and stall cycles. </li><li>Compute and analyze performance metrics such as IPC, CPI, MPKI, memory bandwidth utilization, and stall breakdowns. </li><li>Optimize system software, applications, and drivers for throughput, latency, and performance determinism. </li></ul> <p>Virtualization Performance Tuning</p> <ul> <li>Profile and reduce hypervisor overhead, including VM exits, interrupt injection, and stage-2 MMU translation costs. </li><li>Optimize vCPU placement strategies, huge page usage, and IRQ affinity for performance-sensitive workloads. </li><li>Analyze and tune virtio and IOMMU performance paths. </li><li>Investigate cross-core and cross-cluster latency issues, including IPI overhead and interrupt routing on ARM-based systems. </li></ul> <p>CPU PMU and Microarchitectural Analysis</p> <ul> <li>Configure and interpret ARM PMUv3 and related vendor-specific performance monitoring extensions. </li><li>Apply Top-Down Microarchitecture Analysis (TMA) to identify frontend/backend bottlenecks. </li><li>Correlate PMU-derived metrics with kernel traces, source code paths, and system behavior. </li><li>Design and implement custom event sets tailored to workload-specific performance characterization. </li></ul> <p>Required Qualifications</p> <ul> <li> <p>Bachelor's, Master's, or Ph.D. in Computer Science, Electrical Engineering, or a related field.</p> </li><li> <p>8+ years of experience in system performance engineering or related roles.</p> </li><li> <p>Strong understanding of computer architecture, including:</p> </li><li> <p>CPU pipelines, execution engines, and memory hierarchy</p> </li><li> <p>Interrupt architectures (e.g., GICv3/GICv4, APIC concepts)</p> </li><li> <p>MMU, virtual memory, and page table structures</p> </li><li> <p>Deep expertise with Linux performance tooling:</p> </li><li> <p>perf</p> </li><li> <p>eBPF / BCC / bpftrace</p> </li><li> <p>ftrace / trace-cmd</p> </li><li> <p>Proficiency in C/C++, Python, and shell scripting for performance tooling and automation.</p> </li></ul> <p>Preferred Qualifications</p> <ul> <li>Hands-on experience with ARM PMUv3 on Cortex-A55/A76/A78 or Neoverse platforms. </li><li>Experience with one or more virtualization stacks: </li><li>KVM/QEMU </li><li>Xen </li><li>seL4 or other RTOS/hypervisor environments </li></ul> <p>Compensation:</p> <p>The US base salary range for this full-time position is $192,100.00 - $249,600.00.</p> <ul> <li> <p>Within the range, individual pay is determined by work location and additional factors, including job-related skills, experience, and relevant education or training.</p> </li><li> <p>Please note that the compensation details listed in US role postings reflect the base salary only. It does not include discretionary bonus, equity, or benefits.</p> </li></ul> <p>Benefits:</p> <p>Along with competitive pay, as a full-time NIO employee, you are eligible for the following benefits on the first day you join NIO:</p> <ul> <li> <p>Anthem Blue Cross, HSA, and Kaiser HMO medical plans with $0 for Employee Only Coverage.</p> </li><li> <p>Dental (including orthodontic coverage) and vision plan. Both provide options with a $0 paycheck contribution covering you and your eligible dependents.</p> </li><li> <p>Company Paid HSA (Health Savings Account) Contribution when enrolled in the High Deductible Anthem Blue Cross medical plan</p> </li><li> <p>Healthcare and Dependent Care Flexible Spending Accounts (FSA)</p> </li><li> <p>401(k) with Brokerage Link option</p> </li><li> <p>Company paid Basic Life, AD&D, short-term and long-term disability insurance</p> </li><li> <p>Employee Assistance Program</p> </li><li> <p>Sick and Vacation time</p> </li><li> <p>13 Paid Holidays a year</p> </li><li> <p>Paid Parental Leave for first 8 weeks at full pay (eligible after 90 days of employment with NIO)</p> </li><li> <p>Paid Disability Leave for first 6 weeks at full pay (eligible after 90 days of employment with NIO)</p> </li><li> <p>Voluntary benefits including: Voluntary Life and AD&D options for you, your spouse/domestic partner and dependent child(ren), pet insurance</p> </li><li> <p>Commuter benefits</p> </li><li> <p>Mobile Cell Phone Credit</p> </li><li> <p>Free lunch and snacks</p> </li><li> <p>Onsite gym</p> </li><li> <p>Employee discounts and perks program</p> </li></ul>