What I dDo fFor a lLiving

I'm a software developer, focused on backendwho specializes in backend development.

I've been working within software development for seven years.

I decided to followpursue this career when I was a child because I was so comfortable with. Growing up, I was passionate about computers, and I liked to play games.

I rephrased this sentence to sound more natural

I thought that I will work developing games, but noas a game developer, but that didn't turn out to be the case for me.

I work on enterprise softwares.

I'm a software developer, focused on the backend.

I've been working within software development for seven years.

Alternate: I decided to followpursue this career when I was a child because I was so comfortable with computers and I liked to play games.

I thought that I will workould be [working on] developing games, but no.,

I would personally connect this sentence and the last one, it just feels natural. If I were to say it aloud, you would hear some emphasis on the "but no" part, haha.

I'm a software developer, focused on the backend.

I've been working within software development for seven years.

I decided to follow this career when I was a child because I was so comfortable with computers and I liked to play computer games.

I'm a software developer, focused on backend development.

I've been working with software development for seven years.

You could also say "I've been working in software development for seven years."

I thought that I willould work developing games, but nothat didn't happen or that didn't work out.

Instead, I work on enterprise softwares.

You don't need the "instead" but it seemed to be a more logical transition from your previous statement.