PortfolioSan Francisco, CA

Lena
Sato

Staff Machine Learning Engineer

Python PyTorch JAX CUDA Distributed Training Triton C++ Go Kubernetes TensorRT MLOps Transformers Python PyTorch JAX CUDA Distributed Training Triton C++ Go Kubernetes TensorRT MLOps Transformers Python PyTorch JAX CUDA Distributed Training Triton C++ Go Kubernetes TensorRT MLOps Transformers

I build large-scale ML systems that reach hundreds of millions of people. Over the past decade I've taken models from research notebooks to production infrastructure — training, serving, and the unglamorous reliability work in between. I care about systems simple enough to reason about and fast enough to disappear.

Experience

Staff ML Engineer

2021 / NOW

Northwind AI

Lead the training infrastructure for a 70B-parameter foundation model. Cut training cost 40% with a custom data pipeline and brought time-to-first-token down 3× in production serving.

Senior Software Engineer

2017 / 2021

Meridian

Built the recommendation system powering the home feed for 200M+ daily users, lifting engagement 18%. Owned the online feature store end to end.

Machine Learning Engineer

2014 / 2017

DeepVision

Shipped the company's first on-device vision model for real-time object detection on mobile, running at 30fps under 50MB.

Education

M.S. Computer Science

Stanford University · Focus: Machine Learning

B.S. Electrical Engineering & CS

UC Berkeley

Awards

  • NeurIPS Best Paper (2019)
  • Patent: efficient post-training quantization (2020)
  • Internal Engineering Excellence Award (2018)

Off the clock

Bouldering / Generative art / Espresso

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