Design and problem-solving is a key learning focus in technology education and remains a distinguishing factor that separates it from other subject areas. This research investigated how two expert designers considered experiences with hard materials contributed to their learning design and problem-solving with these materials. The research project used a qualitative approach and conducted semi-structured interviews with two mechanical engineers. They identified their experiences under three key headings that provided them with much of the essential knowledge and understanding they employ today to design and problem-solve with hard materials. These included experience of seeing outcomes that provided feedback on their designs, experiences that informed about materials and material selection and accessing others' experiences from communities of practice.