There's upwork.com but in my experience, it's terrible. My advice is to find someone already employed with free time to help out when needed. I wouldn't trust

There's upwork.com but in my experience, it's terrible. My advice is to find someone already employed with free time to help out when needed. I wouldn't trust a queue where you're not sure which admin you'll get on a particular day. Skills vary so much that I don't believe you'll get good results. I imagine part of the problem is that few good systems people are going to want to work at such a service. I'm on a sabbatical now but my last DevOps position paid me 247K a year with great benefits, ESPP, and RSUs. It's unlikely that a good systems person would work in a pool waiting for an hourly engagement when they can make reliable money somewhere else. The marketplace is too good for us on the systems side right now. Some of my friends and I have done hourly work on the side but not in a pool. Most of the time it's for small startups where we know at least some of the people there and they need some help. Maybe I'm just old fashioned but I like to think there's some level of trust needed for systems work. Giving someone root access is a big deal IMO.