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Rethink recruit

Applied Research Engineer

Rethink recruit, San Francisco

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At Sieve, we're reimagining how machines understand video. We're a fast-growing team building cutting-edge AI systems that extract meaning from dynamic, real-world content-automatically, scalably, and in real time.
We're looking for a Applied Research Engineer who thrives in fast-paced, high-ownership environments and wants to push the boundaries of multimodal AI. You'll work with some of the latest Visual Language Models (VLMs) and generative models to build systems for a wide range of video understanding, editing, and search applications. This often means tackling ambiguous research problems and using creative approaches to solve them.
What You'll Do

  • Design, train, and deploy deep learning models to extract insights from video at scale
  • Build robust, performant pipelines in Python for real-time and batch processing
  • Squeeze every drop of performance from models through clever pre/post-processing, pipelining, inference optimization, and fine-tuning
  • Collaborate closely with product and customers to turn ambiguous problems into working systems
  • Prototype with VLMs and multi-modal architectures to push Sieve's technology forward
What We're Looking For
  • 4+ years experience in ML engineering, ideally in a startup or similarly scrappy, fast-moving environment
  • Strong background in deep learning (PyTorch/TensorFlow) and computer vision
  • Fluency in Python and best practices for scalable ML code
  • Experience building AI systems to solve real customer problems
  • A portfolio of side projects, demos, or contributions (GitHub, HuggingFace, etc.)
  • Bonus: research background in ML, experience with CUDA, or open-source contributions

At Sieve, we care deeply about ownership, speed, and craft . If you're someone who loves building impactful ML systems, iterating quickly, and solving novel problems with creativity and rigor-you'll feel right at home.