Senior/Principal Performance Engineer

Role Overview

• CIQ is seeking a highly experienced Senior or Principal Performance Engineer to own and drive system-level and application-level performance across our product portfolio.
• Be the standard-bearer for performance at CIQ and ensure our performance-focused solutions are the fastest in the industry.
• Involve closely with Fuzzball, integrating workloads through it.
• Design, develop, and maintain comprehensive benchmarking frameworks spanning OS, kernel, and application layers.
• Profile workloads across CPU, memory, I/O, network, and accelerator (GPU/NPU) subsystems to identify bottlenecks and optimization opportunities.
• Establish and own performance baselines across CIQ's product and solutions portfolio.
• Build and maintain automated performance regression-detection pipelines integrated into CI/CD workflows using Fuzzball.
• Collaborate across engineering teams to root-cause regressions introduced by upstream kernel changes, compiler updates, or library modifications.
• Drive proactive performance improvements across every layer of the stack.
• Optimize for AI inference and training workloads, HPC workloads, and general computing and service workloads.

Requirements

• A deep, principled understanding of operating system internals
• Linux kernel scheduler, memory subsystem, I/O stack, and networking.
• Proven experience identifying and resolving performance regressions across kernel and user space in production environments.
• Hands-on expertise with profiling and tracing tools: perf, eBPF/bpftrace, Flamegraphs, VTune, Nsight, strace, ftrace, and similar.
• Strong background in AI/ML workload performance
• including inference optimization (TensorRT, ONNX, vLLM, or similar), training efficiency, and GPU/accelerator utilization.
• Experience with HPC workloads: MPI, OpenMP, parallel filesystems, RDMA/InfiniBand, and job schedulers (Slurm, PBS, etc.).
• Familiarity with modern AI-first development workflows and comfort using LLM-based tools to accelerate engineering work.
• Experience building automated performance testing and regression detection pipelines in CI/CD environments.
• Excellent analytical skills
• able to form hypotheses, design experiments, and draw actionable conclusions from complex data.
• Strong written and verbal communication skills; able to present findings to both deeply technical audiences and business stakeholders.
• A collaborative, humble, and always-learning mindset
• combined with the confidence to champion performance as a first-class engineering concern.

Tech Stack

• Linux

Benefits

• Medical, dental, and vision insurance.
• Flexible paid time off.
• Employee stock options.
• Remote work; no travel required for most positions.