Open infrastructure for AI inference and training

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Member of Technical Staff — Training

RadixArk builds open-source and production infrastructure for large language models and multimodal post-training. The Member of Technical Staff, Training will design, build, and operate distributed systems for large-scale model post-training across training, inference, and orchestration, with an emphasis on performance, correctness, scalability, and reliability.

Talent Operations Specialist

RadixArk is an infrastructure-first AI company building open systems for inference and training. The Talent Operations Specialist will build and operate scalable recruiting and people operations infrastructure, including AI-augmented workflows, interview coordination, ATS and HRIS management, documentation, and recruiting metrics.

Talent Operations

Member of Technical Staff - Inference-Multi-Hardware

RadixArk is an infrastructure-first company building open systems for frontier AI inference and training. The Member of Technical Staff will bring up, optimize, and maintain AI systems across diverse accelerator platforms, design portable hardware abstractions, and drive cross-platform performance. The role also involves kernel optimization, benchmarking, debugging, vendor collaboration, and open-source contributions.

Member of Technical Staff — Inference-Multi-Hardware

Member of Technical Staff — Inference-Core Engine

RadixArk is an infrastructure-first company focused on building open systems for frontier AI inference and training. The Member of Technical Staff — Inference-Core Engine will design, optimize, and scale production inference systems, focusing on latency, throughput, GPU utilization, reliability, and performance across distributed infrastructure.

Member of Technical Staff - Developer Technology

RadixArk is an infrastructure-first company building open systems for large-language-model inference and training. The Member of Technical Staff, Developer Technology will optimize GPU performance, enable new models and hardware, develop kernels, support production AI workloads, and improve the SGLang and Miles open-source systems. The role also involves partnering with expert users and engineering teams to solve complex performance and infrastructure challenges.

Member of Technical Staff — Developer Technology

Member of Technical Staff — Backend/API Platform Engineer

RadixArk is an infrastructure-first company building open systems for AI inference and training. The Member of Technical Staff — Backend/API Platform Engineer will build production APIs, control plane infrastructure, platform services, authentication, multi-tenancy, monitoring, and reliability systems powering SGLang and Miles.

Member of Technical Staff — Backend/API Platform

Member of Technical Staff - Inference-Multimodal & Diffusion

RadixArk is an infrastructure-first company building open systems for AI inference and training. The Member of Technical Staff will advance diffusion, flow-based, and multimodal generative models by designing algorithms, training and optimizing models at scale, and translating research into production-quality systems.

Member of Technical Staff — Inference-Multimodal & Diffusion

Member of Technical Staff — TPU Systems

RadixArk is an infrastructure-first company focused on building world-class open systems for AI inference and training. They are seeking a TPU Systems Engineer to develop high-performance systems using JAX, XLA, and Pallas, optimizing workloads on TPU hardware.

Member of Technical Staff — TPU Systems (JAX / XLA / PALLAS)

Member of Technical Staff — Kernel / Compiler / Communication

RadixArk is an infrastructure-first company focused on building world-class open systems for AI inference and training. They are seeking a Member of Technical Staff — Kernel / Compiler / Communication to enhance the performance of frontier AI systems through low-level optimization of kernels, runtimes, and communication libraries across large GPU clusters.

AI Infra Resident (1-Year Program)

RadixArk is launching a full-time, paid, 1-year residency program for aspiring AI infrastructure engineers. The role involves rotating across various domains such as inference and training, working on real production systems alongside senior engineers, and owning meaningful projects that impact thousands of developers.