Not the original poster, but any kind of overtime is rare for salaried work? At least in the US.

I'd take 60% per hour for overtime in a heartbeat as long as it was optional, since I've always ended up doing that kind of work for client/manager goodwill (or the pleasure of not being fired).

Some states (Washington, IIRC?) require overtime hours be tracked even for salaried positions, and those hours should be 1.5x regular rate.

(This is off the top of my head based on an internship 6 years ago)

I think this may be true beneath a certain salary amount, but it's relatively low for software.

For California it depends on both type of work and compensation. You can still be required to pay overtime to a salaried employee if they don't meet certain criterion such as being in a managerial position.

In California, the level for computer professionals is nearly double the main (professional/management/admin) amount ($88K+ vs $45-50K depending on employer size.)

60% of what was billed to the client; so probably the equivalent of 3x or 4x their normal salary rate.

Correct

I understand that you get 60% of what's billed to your client, which probably is several times your salary rate per hour, and not 60% of your regular rate per hour. Maybe?