[kamaal]

If you are working for somebody else, you can't exactly make any extra money by working extra hours. At least in a programmers case.

The only real thing to gain in this case is convenience.

[jdavis703]

I work full time in software engineering and do occasional paid freelancing work. It's quite possible to be full time and work extra.

[isostatic]

Depends on your contract and whether you get paid overtime.