OpenTrain is hiring a remote Physics Problem-Solving AI Training Expert to solve advanced physics problems and produce rigorous, reproducible derivations and analyses to train next-generation AI models. Candidates should ideally have a PhD, advanced PhD candidacy, or postdoctoral physics research experience, along with recent publications and proficiency in LaTeX, Python, SymPy, and Jupyter. The role is open worldwide and requires 10 to 15 or more hours per week over an 8- to 10-week project duration.