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60 Radixark Jobs Hiring Near You

RadixArk

Performance Engineer

Palo Alto, CA · On-site

RadixArk is an infrastructure-first company focused on building world-class open systems for inference and training in AI. The Performance Engineer will analyze and improve performance across various ...

RadixArk

AI Infra Resident (1-Year Program)

Palo Alto, CA

$116K - $148K/yr

About The Role RadixArk is launching a full-time, paid, 1-year residency program for aspiring AI infrastructure engineers. You'll rotate across inference, training, kernels, compilers, and cluster ...

RadixArk

Product Manager

Palo Alto, CA

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 ...

RadixArk

Product Marketing Manager

Palo Alto, CA

$181K/yr

About the Role RadixArk is seeking a Product Marketing Manager to own how SGLang, Miles, and our open source infrastructure are positioned and perceived across the market. SGLang already has 20K ...

RadixArk

Member of Technical Staff - Product

Palo Alto, CA · On-site

$196K - $226K/yr

About the Role RadixArk is seeking experienced product-focused engineers to join our team in building the developer-facing surfaces of our inference and training infrastructure. As a Member of ...

RadixArk

AI Infra Resident (1-Year Program)

Palo Alto, CA · On-site

$116K - $148K/yr

RadixArk is launching a full-time, paid, 1-year residency program for aspiring AI infrastructure engineers. The role involves rotating across various aspects of AI infrastructure, working on real ...

RadixArk

AI Infra Resident (1-Year Program)

Palo Alto, CA · On-site

$116K - $148K/yr

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 ...

RadixArk

Software Engineer, Product

Palo Alto, CA · On-site

RadixArk is an infrastructure-first company focused on building world-class open systems for AI infrastructure. They are seeking a Software Engineer, Product to collaborate with cross-functional ...

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Infographic showing various job openings at Radixark in the United States as of August 2026, with employment types broken down into 100% Full Time. Highlights an 100% Physical job distribution.

Member of Technical Staff - Developer Technology

RadixArk

Palo Alto, CA • On-site

$200K - $400K/yr

Full-time

Posted 24 days ago

Job description

About the Role
RadixArk is seeking a Member of Technical Staff, Developer Technology (DevTech) to make LLM inference and training dramatically faster, cheaper, and more accessible on modern GPU hardware. Our systems sit at the center of how modern AI is served and trained: SGLang is a high-performance inference engine that serves trillions of tokens daily across leading AI companies and research labs, and Miles is our reinforcement-learning post-training framework for large-scale LLM and MoE models. Your work directly advances our mission to democratize AI: every improvement you ship lowers the cost and raises the ceiling of what developers everywhere can build.
As our technical face to a community of expert users and partners, you'll push the performance of SGLang and Miles through the lens of real production workloads. You'll profile and optimize GPU performance, enable new models and hardware, build kernels, deliver day-0 model support, and push the limits of inference and training. Working in close partnership with leading teams across the ecosystem, you'll turn their hardest, most ambiguous problems into concrete wins and clear guidance, and feed those improvements back into our systems and future roadmap.
Key Responsibilities
  • Accelerate AI workloads Profile and optimize GPU performance for real production workloads on current and next-generation hardware, root-causing bottlenecks from kernels to distributed multi-node systems.
  • Go deep in one or two focus areas. The team collectively covers the full stack; each engineer specializes in one or two tracks:
    • Inference performance: engine tuning, benchmarking, long-context and multi-turn optimization, parallelism strategy, production debugging
    • Kernels and model/hardware enablement: custom CUDA/ROCm/Triton kernels, low-precision quantization, day-0 support for new models on new silicon
    • Speculative decoding: draft-model training, acceptance-rate tuning, cross-platform kernel adaptation
    • Training systems: RL post-training with Miles, FP8 training, elasticity, long-rollout and long-context efficiency
  • Partner directly with the ecosystem. Turn ambiguous, high-stakes problems from expert engineers at our key partners into concrete wins, clear technical guidance, and reproducible cookbooks.
  • Enhance SGLang and Miles Feed user-driven improvements back into our open-source systems and roadmap, so every win compounds across the ecosystem.

Qualifications
Minimum Requirements
  • 4+ years of experience in GPU systems, LLM infrastructure, or performance engineering.
  • Strong profiling and debugging skills: able to root-cause performance and correctness issues across the stack.
  • Hands-on GPU programming experience in at least one of CUDA, ROCm, or Triton, and willingness to work across platforms.
  • Strong programming skills in Python plus C++ or CUDA.
  • Comfortable making progress on hard, ambiguous problems with little context to start from, and fast to ramp into unfamiliar systems, codebases, and domains.
  • Ability to translate ambiguous asks into clear technical plans, verified cookbooks, and actionable recommendations, and to communicate credibly with expert engineering audiences.

Preferred (Bonus) Qualifications
  • Deep familiarity with LLM inference internals: distributed serving, parallelism, routing, KV-cache management, scheduling.
  • Experience with low-precision quantization and inference/training (FP8, INT8/INT4; NVFP4 or MXFP4 a strong plus).
  • Experience writing and optimizing custom GPU kernels.
  • Practical familiarity with speculative decoding methods such as Eagle, DFlash, or DSpark.
  • Working knowledge of large-scale distributed training: pre-training, SFT, RL post-training, elasticity, long-context workloads.
  • Experience optimizing across both NVIDIA and AMD platforms.
  • Hands-on experience with SGLang, Miles, vLLM, TensorRT-LLM, Megatron, or comparable frameworks; contributions to open-source AI/ML projects.

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.

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