Senior AI Researcher (Foundation AI) Foundation AI Boston, MA Boston, MA Full Time RESPONSIBILITIES:

Design, train, and optimize large-scale multimodal foundation models that integrate wearable sensor data, text, biomarkers, and behavioral data.

Conduct applied research in self-supervised learning, representation learning, and downstream task fine tuning to advance WHOOP’s core model capabilities.

Develop scalable, distributed training pipelines for large models on high-performance compute environments.

Collaborate with MLOps, data engineering, and software engineering teams to operationalize models for production deployment, ensuring robustness, reproducibility, and observability.

Partner with product and research teams to translate foundation model capabilities into downstream features that deliver meaningful member value.

Contribute to the technical roadmap and architectural direction for foundation model development at WHOOP.

Ensure models adhere to WHOOP’s standards for ethical, transparent, and privacy-preserving AI.

QUALIFICATIONS:

Advanced degree (Master’s or Ph.D.) in Computer Science, Machine Learning, Electrical Engineering, or a related field, or equivalent professional experience.

7+ years of experience in applied ML, AI research, or large-scale modeling, with a track record of delivering production systems.

Expertise in modern deep learning (e.g., transformers, state space models), multimodal model training.

Proficiency in Python and deep learning frameworks (e.g., PyTorch, TensorFlow).

Familiarity with training models on mulit-node, multi-gpu distributed compute environments.

Familiarity with best practices for data, model, and context parallelisms.

Strong applied experience with representation learning, self-supervised methods, and post-training for downstream applications.

Experience with reinforcement learning for post-training foundation models (PPO, DPO, GRPO etc.).

Familiarity with MLOps best practices including model versioning, evaluation, CI/CD for ML, and cloud-based compute.

Excellent communication skills and ability to collaborate cross-functionally with engineers, researchers, and product teams.

Passion for WHOOP’s mission to improve human performance and extend healthspan through science and technology.

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