Principal Applied Scientist, Mission AI Lab, AWS Region Services

What you’d do

Adapt frontier models for complex reasoning tasks, from supervised fine-tuning and post-training through reinforcement learning, and deliver them as production systems. Build evaluation sets, metrics, and data pipelines with leakage and contamination controls. Full-time. Found on the employer's careers page on Oct 20, 2026. Apply through the link.

You’ll need

• 5+ years predictive modeling and analysis
• PhD in EE, CS, Mathematics, or related technical field
• Supervised fine-tuning and post-training
• Reinforcement learning
• Evaluation set and metric design