Most significant career decisions and frustrations can't be discussed at work (political risk) or fully with home partner (different lens). A trusted career confidant — outside both contexts, similar professional level, mutually committed — provides perspective both can't.
Who to look for
Senior peer in different company or industry. Old colleague who left. Friend with similar career stage from outside work. The relationship works through reciprocity and confidentiality.
Build the relationship over 2-3 years. Most important career conversations of mid-career happen with this person. Worth the investment.