Radixark
Member of Technical Staff — Kernel / Compiler / Communication
Palo Alto, CA · Staff+
Sponsorship not specifiedDetected 9 hours ago
PythonC++GitAWSMachine LearningLLMsResearchCommunication
About the role
- RadixArk is seeking a Member of Technical Staff - Kernel / Compiler / Communication to push the limits of performance for frontier AI systems.
- You will work at the lowest layers of the stack - kernels, runtimes, compilers, and communication libraries - to unlock maximum efficiency from modern accelerators and interconnects.
- This role is critical to scaling training and inference across thousands of GPUs, where microseconds and memory bandwidth matter.
Responsibilities
- Design and implement high-performance kernels for AI workloads
- Optimize compiler and runtime stacks for ML systems
- Collaborate with training and inference teams on performance optimization
- Develop tooling for profiling and performance analysis
- Push the limits of hardware-software co-design
- 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.
- We're backed by well-known infrastructure investors and partner with Nvidia, Google, AWS, and frontier AI labs.
- Join us in building infrastructure that gives real leverage back to the AI community.
Requirements
- 5+ years of experience in systems, compiler, or performance engineering
- Strong expertise in CUDA or accelerator programming
- Experience writing or optimizing high-performance kernels
- Experience with distributed communication libraries (NCCL, MPI, RCCL, etc.)
- Solid knowledge of networking and interconnect technologies
- Proficiency in C++ and Python
- Experience with Triton, TVM, XLA, or MLIR
- Familiarity with NVLink, InfiniBand, or RDMA
- Experience optimizing collective communication at scale
- Experience scaling workloads to 1000+ GPUs
Compensation
- We offer competitive compensation with meaningful equity, comprehensive benefits, and flexible work arrangements.
- Compensation depends on location, experience, and level.
Benefits
- We offer competitive compensation with meaningful equity, comprehensive benefits, and flexible work arrangements.
Company info
- We're on a mission to democratize frontier-level AI infrastructure by building world-class open systems for inference and training.
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.
Visa & Work Authorization
- t 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
Apply directly at Radixark →Create a free account for alerts like thisView Radixark immigration profile
This listing is sourced directly from Radixark's careers page and normalized into a canonical job model.