Research Engineer / Scientist, Foundational Multimodal Models

Fixie.ai
Fixie.ai

Posted on Jun 23, 2026
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About Fixie

We’re a Seattle-based AI startup (with support for working remotely). We’ve raised $17M in seed funding. Our vision is simple: build artificial intelligences that can communicate as naturally as humans. We’re a small team of researchers and engineers with a deep focus in speech and real-time technologies. Our core model, Ultravox, is open-source. We also build a serving stack that’s optimized for very low-latency interactions.

The Role

As a Research Engineer & Scientist, you will lead the effort to develop next-generation foundational multimodal models that power Ultravox, our open-source speech-to-speech model.

What you’ll do

  • Lead critical research on architectural design, pre-training, and post-training of foundational multimodal models to develop real-time voice AI.
  • Collaborate with a team of researchers and engineers to develop foundational multimodal models with comprehensive capabilities in speech understanding, speech generation, and full-duplex real-time communication.
  • Develop novel models based on public and proprietary data sources.
  • Build tools to improve our data flywheel and measure model quality.
  • Drive the optimization and deployment of AI models for real-world applications in partnership with engineering and product teams.

    • Things we’re looking for

  • An incredibly strong AI researcher with a track record of contributions to AI research, systems, and products.
  • Experience with large language models, speech models, and multimodal models.
  • Strong experience in Python and, ideally, PyTorch.
  • Ability to roll up your sleeves and get things done.
  • A great communicator and team player.

    • Benefits

  • Generous equity package
  • Unlimited PTO (take time when you need it)
  • Top-of-market salary
  • Great healthcare
  • 401k with match

    • Apply

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