staż pracy in English:

In their second year, students can do a work placement and get some valuable real-life experience.

he has the seniority position

Promotion is done strictly on the basis of seniority.

In Japan wages are usually in proportion to seniority.

I would feel more optimistic about a bright future for man if he spent less time proving that he can outwit Nature and more time tasting her sweetness and respecting her seniority.

What's your work experience?

The high school student wanted to get some work experience as a journalist, so she approached the local newspaper.

At school I completed my work experience period in a newspaper office. I learned a little about publishing.