Mindrift is seeking a freelance Mechanical CFD Engineer in Spain to train and evaluate AI agents on expert-level fluid simulation tasks by preparing CAD geometry, running simulations, and writing Python checks. Candidates need a relevant engineering degree, hands-on CFD experience (OpenFOAM, Fluent, or STAR-CCM+), Python proficiency, and at least B2 English. The role is remote part-time with an estimated commitment of 10–20 hours per week during active phases.