Hello everybody

Hello, my name is Frank. I want to learn English because I like the language and I need it in my job. I´m a software developer.

These were the only corrections that were absolutely necessary. 

Of coarse, an English speaker would probably say it a little differently. 

I would probably say it this way.

Hello, my name is Frank and I am a software developer. I want to learn English because I like the language, but I also need to learn it for my job.

Hello, my name is Frank, a software developer. I want to learn English well because I like this language and I need to use it in my job.