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Cactus (YC S25) Logo

AI Research Engineer

Cactus (YC S25)

$120,000 - $180,000
Sep 9, 2025
San Francisco, CA, US
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Cactus is looking to solve the problem of running AI models locally on smartphones by providing a cross-platform open-source framework. This role will contribute to building and maintaining the tools and infrastructure necessary for app developers to deploy AI models directly within their mobile applications.

Requirements

  • Strong background in Python, PyTorch/JAX internals
  • Experience with deep learning and SOTA LLM/VLM/TTS
  • Experience with C++ and ml inference is preferred

Responsibilities

  • Read papers and replicate models/techniques in Cactus
  • Build and maintain Python tools for porting JAX/PyTorch models to Cactus graphs
  • Synergize strong mathematical foundations, intimate understanding of machine learning frameworks and experience with foundation models
  • Work with model companies to get them started with Cactus

Other

  • Masters/PhD degree in CS/Maths/AI/Physics, or relevant experience
  • Ability to work collaboratively in a team environment
  • A sense of urgency and interest in startups
  • Ownership and high sense of agency