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← Zyphra

Research Engineer - AI Performance & Kernel Optimization

Zyphra · San Francisco

CHECKED 7H AGO

Frontier labonsite
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At a glance

Highlights

  • Optimize large-scale LLM training and inference for frontier-scale AI systems.
  • Hunt bottlenecks in memory, communication, and compute to boost throughput.
  • Turn low-level systems wins into real-world training and inference gains.

What they offer

  • Comprehensive medical, dental, vision, and FSA plans
  • 401(k) plan
  • Relocation and immigration support on a case-by-case basis
  • In-office snacks and meals provided
  • Unlimited PTO and company holidays

Ideal candidate

Deep systems thinker who loves chasing the last 10-20% of performance and reasoning about hardware-software tradeoffs. Thrives collaborating across research and infra to translate low-level wins into frontier-scale impact.

Requirements

  • Strong engineering aptitude for building reliable, high-performance systems
  • Excellent low-level performance intuition for hardware-software interactions
  • Eager to rapidly learn new systems, tools, and hardware environments
  • Excellent communication and collaboration skills across research and engineering
  • Enjoy hunting down the last 10-20% of performance
  • Experience writing highly performant GPU kernels
  • Experience optimizing ML workloads for large-scale training and inference
  • Understanding of distributed training and parallelism schemes
  • Experience using profiling and debugging tools for performance improvements
remote policy
In-person in San Francisco
visa sponsorship
Immigration support on a case-by-case basis

Lab profile

About Zyphra

San Francisco AI lab building open language and audio models and autonomous desktop agents.

What they build

  • Desktop and browser-based autonomous agents
  • Open language models
  • Open-source audio models (ASR, TTS, speech-to-speech)

Known for

  • Agentic systems and human-AI interaction
  • Reinforcement learning, post-training and preference learning
  • Large-scale language model pre-training
  • Novel model architectures and training methods

Key facts

  • Headquartered in San Francisco, California
More about Zyphra →
Apply on the lab’s site ↗