[jimmaswell]

It depends on the person and domain. I've been in the industry for 5 years, but I worked on a lot of projects and did a lot of self learning since high school through college. Now I've been promoted to a front end lead position and I'm fully comfortable with the "senior" in my job title.

[pojzon]

Being a senior is about how confident you are with your skill and your proven ability to deliver.

It has nothing to do with years or getting depth in projects. Most projects are just data pipes. Hard projects are rare.