Principal Research Engineer, Model Training & Post-Training

Inflection AI seeks a hands-on technical leader to own the model-improvement loop for their emotionally intelligent AI, spanning data, training, evaluation, and production release. The role sits at the intersection of research and engineering, requiring expertise in large-scale foundation model training and alignment to ship measurable improvements. This position involves strategic roadmap ownership, building evaluation systems, and partnering with infrastructure teams to optimize performance, cost, and reliability.