I'm kinda frustrated these days. I work as a UI designer

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I'm kinda frustrated these days.

I work as a UI designer in a small agency. We do lots of client work. Obviously the payment is pretty low while my boss earns twice as much. What he is doing is to meet clients, thinking about marketing strategies and do the sales stuff. Sometimes he is helping out designing UIs. Of course he knows how to talk to clients, how to manage the agency, etc. but it still pisses me off that we as designers do all that shit work (often with overwork) and still we earn half of his money or even less.

I see two options: Either I try to get a job in a very big company because I earn much more at there .. Or I do freelancing (every week I get one or two mails from start-ups asking me if I do freelancing).

What do you think? Any advices?