OpenTrain is hiring a Physics Expert specializing in statistical physics, quantum information, or condensed matter theory to evaluate and train AI systems on advanced theoretical and numerical physics problems. Candidates must have a PhD or equivalent experience with methods such as Kramers-Wannier duality, domain-wall free energy, and 4-state Potts model simulations. The position is a fully remote, worldwide freelance contractor role requiring 5 to 10+ hours per week.