You really can’t overemphasize that first day at work experience. When I arrived at my first professional job, my new manger eventually came to meet me. The next words as we walked on were: “now, where am I going to put you”. I realized that he hadn’t thought about me after the interview and had done nothing in anticipation of my arrival. I definitely didn’t feel welcomed or that I was part of a team. I’ve never forgotten that first impression.
As a hiring manager you can make sure a new team member is expected and welcomed. After all, they have just gone through a grueling job search process and chose you over another job somewhere else. Have a clean desk with all the equipment they will need and introduce them to everyone, even if they previously interviewed with everyone. Have an on-boarding agenda that lets the new person spend time with each team member and start them immediately on a first project. Arrange for lunch on the first day and make sure they find their way around. Introduce them outside of the immediate team and with other people whom they will work with. Consider an after-hours team meetup with the new person before their actual start date. Do all of this is in addition to HR’s on-boarding process.
“Life is not a dress rehearsal.”