Which one of these two sound natural? I offer my services for free as I / since I...

[Zoli]

1. I offer my services for free as I see it as an chance to improve as a software developer.

2. I offer my services for free since I see it as an opportunity to improve as a software developer.

 

[Charlie Bernstein]

1. I offer my services for free, as I see it as a chance to improve as a software developer.

2. I offer my services for free, since I see it as an opportunity to improve as a software developer.

They're both fine. You can also use because.

 

[jutfrank]

I suggest using as.

 

[Zoli]

Thank you. Do you think this one sounds more professional?

I am offering my software development services for free; I will use this opportunity to gain experience and apply my skills to real-world applications.

 

[jutfrank]

Thank you. Do you think this one sounds more professional?

No, it's not any more or less professional. Don't think of it in that way.