Member of Technical Staff — CI EngineerPalo Alto, CA

About The Role RadixArk is hiring a Member of Technical Staff — CI Engineer to own the infrastructure that keeps SGLang moving. Our CI system runs 300+ GPU tests across NVIDIA, AMD, Intel, and Ascend hardware pools, gating every commit to one of the fastest‑growing open‑source LLM inference engines. When CI is green and fast, 100+ contributors ship with confidence. When it isn’t, the entire project stalls. That bottleneck is your problem to solve. What You’ll Do Own CI reliability end-to-end — triage failures, distinguish real regressions from flaky tests and infra issues, keep main green Build regression‑based CI — replace hardcoded static thresholds with automated baseline comparison (metrics pipeline, durable storage, detection logic) Harden runner infrastructure — ephemeral runners, container isolation, security hardening for fork PR execution Cut CI time — right-size eval suites, deduplicate server startups, separate PR smoke tests from nightly full runs Improve developer experience — faster feedback, clearer failure messages, workflow orchestration Requirements 3+ years operating CI/CD at scale (GitHub Actions, Buildkite, Jenkins, GitLab CI, or similar) Deep Linux, Docker, GPU computing knowledge Self-hosted runner management experience Strong Bash and Python Security mindset — CI supply chain risks, fork PR attack vectors, runner hardening NVIDIA GPU drivers, CUDA, NCCL, InfiniBand/RDMA experience in CI contexts Familiarity with ML inference workloads (model loading, KV cache, quantization) Nice to Have Large open-source project CI experience (100+ contributors) AMD ROCm or Intel XPU CI pipelines What Success Looks Like Day 20 — Full CI landscape understood, daily triage taken over, top recurring flaky tests fixed, PR CI time reduced 30%+ Day 40 — Regression-based checks live on nightly CI, ephemeral runner prototype deployed, runner isolation in place Day 60 — Zero flaky tests. Main CI 100% green when no real regression exists Compensation We offer competitive base with meaningful equity, comprehensive health benefits, and flexible work arrangements. Compensation is determined by location, level, and experience. Equal Opportunity RadixArk is an Equal Opportunity Employer and is proud to offer equal employment opportunity to everyone regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity, veteran status, and more. #J-18808-Ljbffr RadixArk