JOB DESCRIPTIONAbout NIO 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.
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.
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.
ResponsibilitiesPerformance Analysis and Optimization- Identify and analyze performance bottlenecks across CPU, memory hierarchy, cache, interconnect, and interrupt subsystems.
- Leverage hardware PMU counters to measure and interpret cycles, instructions, cache misses, branch mispredictions, TLB misses, and stall cycles.
- Compute and analyze performance metrics such as IPC, CPI, MPKI, memory bandwidth utilization, and stall breakdowns.
- Optimize system software, applications, and drivers for throughput, latency, and performance determinism.
Virtualization Performance Tuning- Profile and reduce hypervisor overhead, including VM exits, interrupt injection, and stage-2 MMU translation costs.
- Optimize vCPU placement strategies, huge page usage, and IRQ affinity for performance-sensitive workloads.
- Analyze and tune virtio and IOMMU performance paths.
- Investigate cross-core and cross-cluster latency issues, including IPI overhead and interrupt routing on ARM-based systems.
CPU PMU and Microarchitectural Analysis- Configure and interpret ARM PMUv3 and related vendor-specific performance monitoring extensions.
- Apply Top-Down Microarchitecture Analysis (TMA) to identify frontend/backend bottlenecks.
- Correlate PMU-derived metrics with kernel traces, source code paths, and system behavior.
- Design and implement custom event sets tailored to workload-specific performance characterization.
Required Qualifications- Bachelor's, Master's, or Ph.D. in Computer Science, Electrical Engineering, or a related field.
- 8+ years of experience in system performance engineering or related roles.
- Strong understanding of computer architecture, including:
- CPU pipelines, execution engines, and memory hierarchy
- Interrupt architectures (e.g., GICv3/GICv4, APIC concepts)
- MMU, virtual memory, and page table structures
- Deep expertise with Linux performance tooling:
- perf
- eBPF / BCC / bpftrace
- ftrace / trace-cmd
- Proficiency in C/C++, Python, and shell scripting for performance tooling and automation.
Preferred Qualifications- Hands-on experience with ARM PMUv3 on Cortex-A55/A76/A78 or Neoverse platforms.
- Experience with one or more virtualization stacks:
- KVM/QEMU
- Xen
- seL4 or other RTOS/hypervisor environments
Compensation:The US base salary range for this full-time position is $192,100.00 - $249,600.00.
- Within the range, individual pay is determined by work location and additional factors, including job-related skills, experience, and relevant education or training.
- 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.
Benefits:Along with competitive pay, as a full-time NIO employee, you are eligible for the following benefits on the first day you join NIO:
- Anthem Blue Cross, HSA, and Kaiser HMO medical plans with $0 for Employee Only Coverage.
- Dental (including orthodontic coverage) and vision plan. Both provide options with a $0 paycheck contribution covering you and your eligible dependents.
- Company Paid HSA (Health Savings Account) Contribution when enrolled in the High Deductible Anthem Blue Cross medical plan
- Healthcare and Dependent Care Flexible Spending Accounts (FSA)
- 401(k) with Brokerage Link option
- Company paid Basic Life, AD&D, short-term and long-term disability insurance
- Employee Assistance Program
- Sick and Vacation time
- 13 Paid Holidays a year
- Paid Parental Leave for first 8 weeks at full pay (eligible after 90 days of employment with NIO)
- Paid Disability Leave for first 6 weeks at full pay (eligible after 90 days of employment with NIO)
- Voluntary benefits including: Voluntary Life and AD&D options for you, your spouse/domestic partner and dependent child(ren), pet insurance
- Commuter benefits
- Mobile Cell Phone Credit
- Free lunch and snacks
- Onsite gym
- Employee discounts and perks program
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