Member of Technical Staff — Accelerator Systems

RadixArk is an infrastructure-first company focused on building world-class open systems for AI infrastructure. They are seeking a Member of Technical Staff: Accelerator Systems to optimize performance across various AI accelerators and maintain the RadixArk infrastructure stack. The role involves working with cutting-edge technology and collaborating with vendor engineering teams to ensure high performance and reliability of AI systems.

Responsibilities:

• Bring up RadixArk's inference and training systems on new accelerator platforms and drive them to competitive performance
• Design hardware abstractions that let a single codebase stay fast across vendors without forking
• Port and optimize kernels across programming models and memory architectures
• Build cross-platform benchmarking, profiling, and regression detection so performance claims hold up on every target
• Debug numerical divergence and correctness gaps between platforms
• Work with vendor engineering teams on pre-release hardware, compiler and driver issues, and roadmap feedback
• Partner with kernel, runtime, distributed systems, and product engineers to land performance wins end to end
• Serve as the internal source of truth on what each platform is actually good at
• Contribute hardware-specific optimizations, benchmarks, and portability work back to open-source SGLang and Miles