I gave up on my desired configuration after spending 3-5+h in frustrated powerlessness.
I just couldn't make these specific items work together, at all.
That's how I always set things up and I never once wished for anything like gulp or webpack or whatever else is trendy these days.
I wish there was a way to drive cars without the need to be an auto mechanic.
You know, just a plain old script with all the build steps laid out sequentially:
feed this file to this command, pass these arguments, wait for command to finish, take output files and copy them over here .. etc.
I attempted to use it twice and here is what I don't like about it: They give you NO idea whatsoever of how many people are available through the service, what kind of expertise they have or if/when anyone even will be available. Worse than that is when you submit a request, they don't send you any status updates or anything until you get an email that says "It looks like no experts were available" ask you what time YOU are available instead of letting you know when a fucking expert will be on! They also give you zero clue as to what kind of prices you should expect. Is "$2 a minute" going to attract anyone? How about $3? I don't know!
In summary, I think Hackhands is probably one of the worse services that I've ever wasted my time trying to use.
2. CoffeeScript2 with support for modules, with uglifyer/minifier on build.
Both 1. and 2. as a part of a middlemanapp dev/build process, which means the JS process watches and builds a file tree, and the SCSS process does the same.
Even setting up ES6 had issues on build because some incompatibilities of the uglifyjs iirc.
EDIT: Added clarification.