# Senior Machine Learning Engineer (Clinical Team) at Midjourney

- Company: Midjourney
- Role group: Midjourney Medical
- Location: San Francisco Bay Area Hybrid
- Type: FullTime
- Remote: yes
- Posted: 2026-09-18
- Status: active
- Apply: https://jobs.ashbyhq.com/midjourney/9beaa654-e136-4e6d-b51b-4c5b3ccb7e2b?ref=companies-hiring.click

## Description

WHAT YOU’LL DO

 1. Own the tissue-class segmentation and labeling models for the ultrasound CT clinical analysis layer, and the pipelines that make them trainable and verifiable.

 2. Retune across 2D per-slice, 3D volumetric, and 2D×3D fusion as reconstructed image inputs are continuously updated, and clinical indications for use expand.

 3. Define training/evaluation pipelines, datasets, and metrics from the ground up or from open source; map model behavior to user needs and design requirements.

 4. Work with data labeling contractors, expert clinicians, and our internal cloud/data teams on labeling specs, QC, and dataset versioning.

 5. Help productionize models into a versioned, HIPAA-bound analysis service: reproducible/low-latency inference, per-prediction confidence, drift monitoring, and safe fallbacks.


WHAT WE’RE LOOKING FOR

 - Strong applied ML experience with a track record of developing new models — architecting, training, and evaluating from scratch as well as benchmarking against existing models.

 - Experience with image segmentation (semantic/instance, 2D and ideally 3D/volumetric) and the modeling and training-data choices that make it robust across diverse patient anatomy.

 - Comfortable moving fluidly between open-ended research iteration and producing quantifiable, testable models.

 - Fluent in modern deep-learning tooling (e.g., PyTorch) and current development practices.

 - Comfortable working under design controls, where model changes carry documentation and verification weight.


USEFUL EXPERIENCE

 - Image segmentation and label generation with modern architectures (U-Net / nnU-Net, 3D U-Net, transformer-based and promptable segmentation like SAM), including the geometry that ties voxel- and mesh-level predictions back to a coordinate frame.

 - Learning under limited or noisy supervision: self-supervised / semi-supervised methods (masked autoencoders, contrastive pretraining like DINO/SimCLR), active learning, weak labels, and simulation-driven pretraining.

 - Hands-on experience with data curation for ML: building datasets from messy, real-world sources, helping to define ground truth, and managing labeling or simulation pipelines (MONAI, ITK / SimpleITK, 3D Slicer).

 - Experience with segmentation models for ultrasound imaging, whether on synthetic or real images

 - ML for imaging or inverse problems in physics-based domains (CT, MRI, ultrasound, or adjacent), and comfort working alongside reconstruction/signal-processing teams.

 - Deploying models in versioned, auditable, high-stakes settings.

 - A background in anatomy, medical imaging, or body composition and prior work with existing segmentation models is a plus.
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