[drinchev]

Yes. I always thought it is like this.

As a front-end developer :

I've been doing JSPs, but I've rarely modified .java files.

I've been doing JS, but I would not be confident in pushing commits to the server-side code of a NodeJS project.

I've been doing REST API calls, but it would be hard for me to change database queries.

etc.

That's what I think I'm best at. ( You know as every developer it's not a big deal to dig into any problem, but professionals usually rely on experience ).