Member of Technical Staff — Inference

Radix Ark is seeking a Member of Technical Staff — Inference to push the limits of large-scale AI inference.

You will work on the core systems that serve frontier models at scale, optimizing performance, latency, throughput, and cost across thousands of GPUs. This role sits at the intersection of systems engineering, ML infrastructure, and performance optimization.

Your work will directly shape how state‑of‑the‑art models are deployed and experienced by users worldwide.

This is a deeply technical, high-impact role for engineers who enjoy working close to the hardware–software boundary and solving performance‑critical problems at scale.

5+ years of experience in systems engineering, ML infrastructure, or performance‑critical backend systems

Strong expertise in large‑scale inference systems for LLMs or generative models

Deep understanding of GPU architecture and performance characteristics

Experience optimizing latency- and throughput‑critical production systems

Strong knowledge of distributed systems and networking fundamentals

Proficiency in C++, Rust, Go, or Python for production systems

Experience profiling and optimizing compute‑intensive workloads

Experience with LLM serving stacks (vLLM, TensorRT‑LLM, SGLang, etc.)

Familiarity with CUDA, Triton, or custom kernel optimization

Experience with batching, KV‑cache management, and scheduling strategies

Experience running inference at scale (1000+ GPUs)

Background in HPC or high‑performance systems

Open‑source contributions in ML or systems infrastructure

Design and build large‑scale inference systems for frontier AI models

Optimize latency, throughput, and GPU utilization in production inference

Develop and improve model serving architectures and runtimes

Work on batching, scheduling, and memory management strategies

Collaborate with kernel, compiler, and systems teams on performance optimization

Debug performance bottlenecks across the stack

Drive reliability and scalability of inference infrastructure

Build tooling for observability, profiling, and performance analysis

Contribute to long‑term inference architecture and strategy

Radix Ark is an infrastructure‑first company built by engineers who've shipped production AI systems, created SGLang (20K+ Git Hub stars, the fastest open LLM serving engine), and developed Miles (our large‑scale RL framework).

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 and designed distributed systems coordinating 10,000+ GPUs across training and serving.

We're backed by leading infrastructure investors and collaborate with frontier AI labs and cloud providers.

Join us in building the infrastructure layer that powers the next generation of AI.

We offer competitive compensation with meaningful equity, comprehensive benefits, and flexible work arrangements. Compensation depends on location, experience, and level.

Radix Ark is an Equal Opportunity Employer and welcomes candidates from all backgrounds.