Senior ML Scientist — Biomedical AI Frontier

Pfizer Belgium; Bothell (WA); Hybrid; USD 139,000 - 232,000; Full time

Job summary

Pfizer is seeking a Senior Principal Machine Learning Scientist to advance AI methods across the drug discovery and development lifecycle. You will build foundation models, multimodal and graph-based approaches, and agentic reasoning systems to generate scientific insights and accelerate experimentation.

You will design rigorous experiments, set scalable evaluation standards, translate research into trusted capabilities, and collaborate with engineers, biologists, and clinicians to impact

Qualifications

• PhD with 2+ years of ML/AI research preferred
• Master's with 5+ years of industry/research experience required
• Strong publication/patent track record valued

Responsibilities

• Develop Frontier AI methods for biomedical research.
• Design and execute rigorous, reproducible experiments.
• Set evaluation standards at scale across datasets and benchmarks.
• Translate models into scientific evidence with cross-disciplinary teams.
• Build reusable foundations and workflows for cross-disease transfer.
• Raise scientific bar through reviews, planning, and mentorship.

Skills

Python programming

PyTorch

JAX

Scientific reasoning

Experimental design

Education

PhD in quantitative field

Master's degree + 5+ years

Tools

JAX

Distributed training

Experiment tracking

Job description

Pfizer is seeking a Senior Principal Machine Learning Scientist to advance AI methods across the drug discovery and development lifecycle. You will build foundation models, multimodal and graph-based approaches, and agentic reasoning systems to generate scientific insights and accelerate experimentation.

You will design rigorous experiments, set scalable evaluation standards, translate research into trusted capabilities, and collaborate with engineers, biologists, and clinicians to impact