What are you doing is incorrect?
Yes. робити is infinitive for "to do" and not conjugated. There is no implication of "you" in this one.
To my ear, the speaker sound like робЕти Is that simply the way it is in Ukrainian, or am I hearing incorrectly? Is every stressed и pronounced /e/ ?
The Ukrainian vowel и is pronounced like the letter i in English words such as hit, kiss, sin, tin, list, etc.
Indeed, Ukrainian /ɪ/ is somewhat in-between [ɪ] and [e]. Wikipedia says that it can be transcribed as [e̠], [ë], [ɪ̞] or [ɘ̟] in precise transcription.