Member of Technical Staff — CI Engineer

Responsibilities

• Own CI reliability end-to-end, including triaging failures and distinguishing regressions from flaky tests
• Build regression-based CI using automated baseline comparison and metrics pipelines
• Harden runner infrastructure through ephemeral runners and container isolation
• Reduce CI cycle times by optimizing evaluation suites and workflow orchestration
• Improve developer experience with faster feedback and clearer failure messages

Requirements

• 3+ years operating CI/CD at scale (GitHub Actions, Buildkite, Jenkins, or GitLab CI)
• Deep knowledge of Linux, Docker, and GPU computing
• Experience with self-hosted runner management
• Proficiency in Bash and Python
• Security mindset regarding CI supply chain risks and runner hardening
• Experience with NVIDIA GPU drivers, CUDA, NCCL, and InfiniBand/RDMA
• Familiarity with ML inference workloads such as model loading and quantization

Preferred Qualifications

• Experience with CI for large open-source projects with 100+ contributors
• Experience with AMD ROCm or Intel XPU CI pipelines

About the Company

RadixArk is an infrastructure-first company built by engineers who created SGLang, a high-performance open-source LLM inference engine. We are on a mission to democratize frontier-level AI infrastructure by building world-class open systems for inference and training.