Hello Keith ,
My name is Martin,I'm a native mandarin and shanghainase speaker . I ever teached mandarin for some foreigners on some apps for instance Hellotalk and Tandem , they all said that the Pinyin is so difficult . I don't know your mandarin level ,if you are familar with Pinyin , I think we could learn something different . My career is an industry product designer , if you are interested in technology ,we could discuss mold and plastic . Ah ,at last I forget to tell you my english level , that's upper intermediate . Contact me , don't be hesitate~~!!