My experience is that finding consistent independent work is "easy" up to $50/hr. Beyond that, and I need to go through agencies where they expect me to pretend to want to be full time.
I have manged to leverage that to get a part time gig that paid better; e.g. I got a high paying gig through an agency, proved myself difficult to replace, /then/ suggested they let me go part time on the same hourly rate. Worked okay for a while.
But yeah, my experience is that you can demand $50/hr from random craigslist gigs. There is a /lot/ of remote work available at $25/hr. I remember in the early to mid aughts, I supported myself for a few years this way; I had a primary gig that gave me a retainer that was large enough to cover rent (I think I was charging them $35/hr for retainer hours, and $45/hr for hours above that. I mean, I was in my early to mid 20s, so it wasn't great money, but it wasn't terrible. ) then I would take random gigs over and above that for more money; I had about three regular clients that I didn't have "retainer" agreements with, so there was always enough money.
Hm. I wonder if it's easier as a SysAdmin, because it's very clear that my work is going to be required on an ongoing basis? Some people seem to think that after the project is done, they won't need the developers. But most people understand that you need a sysadmin ongoing.
You resolve this with your 'retainer' agreements. Client agrees to pay a monthly fee, I agree to a certain level of availability, and to prioritize said client over my other clients and/or my personal stuff.
I've also tried to set a schedule when I was available, then if you wanted me outside of that schedule, you had to agree to pay a incident fee to wake me up. But, I haven't had anyone bite on that idea. I think the retainer thing is more traditional.
Even with a retainer, of course, you can't get real 24x7x365 coverage with one person. that's just not how the physics of the situation work.
And in that case, I only had one client that had a retainer. Without a retainer? Sure, when shit breaks, the client is going to call and whine and cajole and threaten, and sure, I'm going to try to help him or her out, but... any pre-existing agreements I have come first.
The bare truth, though, is "I'll get to you after I clear up this other mess" is "good enough" for most things. Especially for employers who are picking sysadmins up off craigslist for $50/hr.
There are flexible positions out there. Another option is to start your own company. That's what I did when I wanted freedom. I made the mistake of starting a hardware company the first time...the second time I made it software, and made sure nothing about it required me to answer phones or be in one place for any length of time.
This topic comes up every so often. It rarely ends up as a silver bullet to financial independence.
https://news.ycombinator.com/item?id=6350201 (4 months ago)
http://www.mrmoneymustache.com/2011/10/25/the-joy-of-part-ti...
I'm not sure if it's possible if you use the US-NL immigration agreement, but you might even get innovation subsidies in which case you can become an independent consultant, work 4 months of the year and spend the money you earned tax-free in the other 8 months.
But yeah, get them through one of the subsidy offices. It'll cost you 700 to 1200 Euros but increases the chances you'll get it and is definitely worth offloading the administrative hassle.
I use subsidiefocus.nl, but feel free to shop around. Just keep in mind that there are sharks out there that will get you to pay E2000/yr and bind you for multi-year contracts; so shop around and be wary of AdWords advertisers.
Oh yeah; also make sure you inquire about the RDA subsidy which is not that big, but is often available on top of the WBSO subsidy.
What exactly do you want to find out about it?
Some places I'd start looking are:
(1) http://letsworkshop.com - terrific resource for freelance gigs
(2) http://weworkremotely.com - very high signal
(3) Recruiters - most deal with full time employment, but they usually have some clients that want contractors. Some firms even offer subcontracting arrangements (they take a % of your rate, but even then it's usually much more than $25/hour)
(4) Old co-workers/bosses - usually the best way to get contracts since you have a connection
(5) http://hnhiring.me - HN posts every month
The first one or two contracts might be difficult to find. After that, referrals start kicking in. Plus you might find a client who requires long-term part-time work (that's what happened for me).
Of course, those jobs may well be less fulfilling professionally, but that's just another trade off along with the money.
Given my living arrangements and lack of dependents, it didn't require any effort at all to save 50% of this money and put it into long-term (retirement) investments. Ten years of a similar arrangement would ensure a very decent nest egg, assuming I kept living below my means. Given that skills and salaries increase quickly, after a couple of years it would almost certainly be possible to scale back 25% and keep saving more or less the same amount.
As long as you are in a position to plan ahead, this shouldn't be a problem. It helps to view the glass as half full rather than half empty; many people will only see the negativity in any suggestion. Money is often a subject where the naysayers talk louder than the rest.
Just something to plan for.