Pursuing a Master's remotely while working in industry?
I think what you're forgetting is that a master's involves a lot of coursework, not just research.

Your idea is only likely to work if the courses are designed to be taken remotely.  Take into account that even when you are attending the classes in person, you had some trouble.  It wouldn't be fair to put you in suboptimal conditions and suddenly expect a strong academic performance.  One might be able to get by in an undergraduate program with C's, but that wouldn't fly in a graduate program.

You're considering a binary choice right now, work full time or work full time and pursue a master's at the same time.  There is a third option -- get started in industry now, and go back to school later on at some point.

By the way, there is no rule that you must be enrolled in a degree program, or even that you get academic credit for doing research.  If you are interested in a research project for its own sake, you can always work on it for the satisfaction itself.

However, it might be wise to wait to get started with such a project until after you see how much time and energy you really have to spare.  In other words, allow yourself to get in the swing of the new job before committing.  Perhaps you could leave things open with the professor you have in mind working with.