--- title: 'Member of Technical Staff — Cluster Infrastructure & Supercomputing at RadixArk' canonical: 'https://feeny.ai/job/member-of-technical-staff-cluster-infrastructure-supercomputing-radixark-palo-s3wqqk0rmnkp' type: 'job' last_seen: '2026-09-06' --- # Member of Technical Staff — Cluster Infrastructure & Supercomputing at RadixArk - **Company:** RadixArk - **Location:** Palo Alto, CA - **Posted:** 2026-02-17 - **Last confirmed live:** 2026-09-06 - **Apply:** https://job-boards.greenhouse.io/radixark/jobs/4134836009 ## Job description ## About the Role RadixArk is looking for a Member of Technical Staff Cluster Infrastructure to architect and scale the core compute platform that powers frontier-level AI training and inference. You will design and operate highly reliable, high-performance GPU/TPU clusters, build next-generation scheduling and resource management systems, and push the limits of large-scale distributed infrastructure for AI workloads. This role focuses on deep systems engineering across cluster architecture, networking, scheduling, and performance optimization. Your work will directly impact how efficiently frontier AI models are trained and served. ## Requirements - 5+ years of experience in distributed systems, infrastructure, or large-scale compute platforms - Strong background in distributed systems design and systems architecture - Deep experience with cluster management systems (Kubernetes, Slurm, Ray, or custom schedulers) - Hands-on experience with GPU/TPU infrastructure in production environments - Strong Linux systems and networking fundamentals - Proficiency in Go, Rust, C++, or Python for production systems - Experience debugging complex multi-layer issues across hardware, OS, networking, and distributed services - Proven ability to design reliable, scalable systems in production Strong Plus: - ## Experience with large-scale ML/AI workloads - Familiarity with RDMA, InfiniBand, or high-performance networking - ## Experience operating clusters at 1000+ GPU scale - Background in HPC or performance-critical systems - Open-source contributions in systems or infrastructure ## Responsibilities - Architect and scale large AI compute clusters for training and inference - Design cluster management, scheduling, and resource allocation systems - Optimize performance, utilization, and reliability of GPU/TPU clusters - Improve fault tolerance and system resilience at scale - Drive observability, monitoring, and performance profiling for cluster infrastructure - Collaborate with ML and systems engineers to support frontier AI workloads - Lead capacity planning and infrastructure scaling strategies - Build internal platforms and tooling to improve developer productivity - Document architecture, operational practices, and reliability strategies - Contribute to long-term platform vision and technical direction ## About RadixArk RadixArk is an infrastructure-first company built by engineers who've shipped production AI systems, created SGLang (30K+ GitHub stars, the fastest open LLM serving engine), and developed Miles (our large-scale RL framework). Founded by AI infrastructure veterans from xAI and NVIDIA, we're on a mission to democratize frontier-level AI infrastructure by building world-class open systems for inference and training. Our team has optimized kernels serving billions of tokens daily, designed distributed training systems coordinating 10,000+ GPUs, and contributed to infrastructure that powers leading AI companies and research labs. ## Compensation Depending on background, skills, and experience, the expected annual salary range for this position is $200,000 - $400,000 USD + equity. ## 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. ## About RadixArk ## Company Overview - **One-liner**: RadixArk builds open, large-scale inference and training systems to democratize access to frontier AI infrastructure for the entire AI community. - **Entity Type**: Private (Seed stage) - **Headquarters**: San Francisco, California, United States - **Founded**: 2025 - **Founders**: Ying Sheng (CEO) and Banghua Zhu ## Core Business - **Primary industry/industries**: AI Infrastructure, Deep-Tech, Open Source Software - **Target customers**: Individual developers, startups, enterprises, and research labs building and deploying AI systems at scale. - **Mission or purpose statement**: "Make frontier-level AI infrastructure open and accessible to everyone." [radixark.com](https://radixark.com/) ## Products & Services - **[SGLang (Inference Engine)](https://radixark.com/)**: An open-source, high-performance serving engine for AI models. It has become a de facto standard, powering trillions of tokens daily for leaders like Google, Microsoft, NVIDIA, and xAI. RadixArk is the primary steward. **Type:** Open-Source Software / Managed Service - **[Miles (RL Framework)](https://radixark.com/blog/radixark-launches-100m-seed)**: An open-source framework for large-scale reinforcement learning and post-training. Designed for efficiency and stability, it has been adopted for large-scale MoE training. **Type:** Open-Source Software - **Managed Infrastructure & Tooling**: Built on top of SGLang and Miles, RadixArk offers managed services for the full lifecycle of AI development, from training to inference, for teams developing AI at scale. **Type:** Managed Service / Platform ## Market Standing - **Valuation/Market Cap**: $400 million post-money valuation (as of May 2026) [cbinsights.com](https://www.cbinsights.com/company/radixark) - **Key Metric**: $100 million total funding (Seed Round) - **Notable Investors/Partners**: Accel (lead), Spark Capital (co-lead), NVentures (NVIDIA's venture arm), and participation from Google, Microsoft, and other strategic partners. [radixark.com](https://www.radixark.com/blog/radixark-launches-100m-seed) - **Growth Signals**: The company has 19 employees as of mid-2026 but has seen a monthly headcount growth of +55.6%. Its open-source projects (SGLang and Miles) are already adopted by industry giants and research labs, indicating massive traction and developer mindshare. [linkedin.com](https://www.linkedin.com/company/radixark) ## Competitive Advantages - **Open-Source Moat**: Its core products, SGLang and Miles, are open-source community standards with deep adoption. This creates a network effect and developer loyalty that is hard for proprietary competitors to replicate. - **First-Principles Engineering Culture**: The company treats infrastructure engineering as a core creative discipline, not a support function, leading to deeper system-level innovations. - **Top-Tier Talent & Backing**: Founded by the creators of SGLang and backed by Accel, Spark Capital, and NVIDIA, giving it immediate credibility, capital, and access to frontier hardware. - **Clear Mission**: Focusing on making infrastructure "10x cheaper and 10x more accessible" directly addresses a massive pain point for the entire AI ecosystem. [radixark.com](https://www.radixark.com/) ## Strategic Focus - **Growing SGLang & Miles**: Using the $100M seed to accelerate support for new model architectures, hardware platforms, and community improvements. - **Building Managed Services**: Developing the managed infrastructure and tooling layer on top of its open-source cores to serve a wider range of customers. - **Hiring Deeply Technical Talent**: Actively recruiting top-tier engineers for kernels, compilers, training systems, and TPU systems to maintain its engineering edge. - **Expanding Global Reach**: With a Sales role based in Singapore, the company is signaling an intention to serve the APAC market. ## Why Work Here - **Impactful Mission**: Employees contribute directly to making frontier AI infrastructure a shared foundation, working on problems that affect the entire AI ecosystem. - **Engineering-Centric Culture**: The company explicitly states that "infrastructure engineering is not a support function," making it an ideal environment for deep-tech systems engineers who want to solve hard, first-principles problems. [radixark.com](https://www.radixark.com/blog/radixark-launches-100m-seed) - **Work with Open Source at Scale**: You will be contributing to and stewarding widely-used open-source projects (SGLang, Miles) that power trillions of tokens daily. - **Strong Backing & Early Stage**: Joining a well-funded seed-stage company with a $400M valuation offers significant upside and the chance to shape the company's culture and direction from an early stage. - **Location & Hybrid Policy**: The company is headquartered in Palo Alto and San Francisco, California, with most roles listed as in-office. They also have a role in Singapore. - **Notable Perks**: The company's blog emphasizes a culture of being "focused, humble, fearless, and meticulous," which appeals to mission-driven engineers. ## Sources 1. [RadixArk Official Website](https://radixark.com/) 2. [RadixArk Blog: $100M Seed Announcement](https://www.radixark.com/blog/radixark-launches-100m-seed) 3. [RadixArk Jobs on Greenhouse](https://job-boards.greenhouse.io/radixark) 4. [RadixArk LinkedIn Page](https://www.linkedin.com/company/radixark) 5. [CBInsights Company Profile](https://www.cbinsights.com/company/radixark) ## Other roles at RadixArk - [Talent Operations](https://feeny.ai/job/talent-operations-radixark-palo-alto-bt6t3qbk45qe) — Palo Alto, CA - [Member of Technical Staff — Inference-Multi-Hardware](https://feeny.ai/job/member-of-technical-staff-inference-multi-hardware-radixark-palo-alto-5mtbdk97kyhg) — Palo Alto, CA - [Member of Technical Staff — Developer Experience](https://feeny.ai/job/member-of-technical-staff-developer-experience-radixark-palo-alto-5a7wr087scr0) — Palo Alto, CA - [Member of Technical Staff — Developer Technology](https://feeny.ai/job/member-of-technical-staff-developer-technology-radixark-palo-alto-vgg40r7f304a) — Palo Alto, CA - [Visual Designer](https://feeny.ai/job/visual-designer-radixark-palo-alto-zs66af26bhhk) — Palo Alto, CA - [Product Marketing Manager](https://feeny.ai/job/product-marketing-manager-radixark-palo-alto-jw9xehpywsd4) — Palo Alto, CA - [Business Development](https://feeny.ai/job/business-development-radixark-palo-alto-c182fj5brh29) — Palo Alto, CA - [Member of Technical Staff — Performance](https://feeny.ai/job/member-of-technical-staff-performance-radixark-palo-alto-f19h4n3ewdzv) — Palo Alto, CA - [Member of Technical Staff — Product](https://feeny.ai/job/member-of-technical-staff-product-radixark-palo-alto-as44m8evvp3v) — Palo Alto, CA - [Technical Program Manager](https://feeny.ai/job/technical-program-manager-radixark-palo-alto-dttqfvsvp6yv) — Palo Alto, CA