Assuming you know about a person because of that person's job is limiting and can result in unfair stereotypes about your fellow human beings.
Assuming you are a product of your job, rather than that your job is simply something you, the individual, choose to do, limits your own perceptions of yourself.
You can excel at your job without letting your job define who you are by putting aside the distraction of thought to immerse yourself in the doing of your work.
Cultivating a degree of detachment and perspective on your job can help you find ways to perform your job better. It can also make it clear when it is time for you to move on.
Zazen breaks at your desk during the day can help keep your day and your duties in perspective.