"Wanting to please" is just fine-tuned implicit prompt stuff, though. You can tell the LLM that it's roleplaying as a senior engineer, and should consider you, the human to be a junior engineer it works with, who is asking it for advice. You can just leave it at that (often works, if the AI knows enough about how software is produced); or you can describe particular traits of senior engineers — e.g. "wants code that works" and "knows when to say the code is good enough and that the junior is now wasting time by fiddling with it."