I was hired for an Analyst role. A month after my joining, our group published a senior analyst opening. My qualifications (education + work experience) fulfill the criteria mentioned on the website. Can I ask my manager for the other role? If so, how to ask? Should I ask my manager or HR?
You may find that your company doesn't allow a job change or a promotion for a specific amount of time after joining. This is to prevent the need to do three rounds of interviews to fill two slots. In some companies the hiring software may even block your application as soon as you try to apply.
There is little harm in asking. I would inquire about the procedures, without focusing on your interest in applying.
"Hey boss I see that there is an opening for a senior analyst...is that the type of thing that somebody can get promoted to, or must somebody apply for the senior analysts position."
"Hey boss I see there is an opening for a senior analyst...how long must somebody wait to apply for a new position? Are all applications blocked for 6 months? a year?"