For this reason at my company we often do the code review of a junior developer's first pull request in person and in private. I think it's worked decently well

For this reason at my company we often do the code review of a junior developer's first pull request in person and in private. I think it's worked decently well to ensure that comments can be the start of a conversation and not a reprimand, and to help the junior to understand that the comments are not meant to be a personal criticism.