I am a software engineer and our company hands out promotions around performance review time.
Previously I endorsed a coworker without having worked closely with them, having only a familiarity with their work. They didn't get the promotion last year and are trying again this year.
My problem is that after working closely with this person I no longer wish to endorse their work. Endorsements are visible to my coworker.
How should I handle this situation without damaging the relationship with my coworker?