Anecdata: Recently spoke with a friend's son who graduated compsci a year-ish ago, he reckons none of his year got jobs, now working in a kitchen. (in australia for context). Very sad. For comparison, I graduated just after the dot-com crash, and our year mostly found jobs, just not very good ones, so maybe they're doing worse than we did. Good luck convincing anyone to study compsci any more.
As an Aussie computer science student, I do wonder what they are actually looking for. I know full well that uni isn’t teaching anything useful (heck my uni doesn’t even allow compsci students to take C programming) so I try and extend my knowledge by working on projects in my own time. Recently I’ve been getting into reverse engineering, before that I was writing my own shell from scratch in C. Is this good stuff to do job-wise?
Sure. Contributing to open-source, releasing and maintaining independent projects, is also good because it shows you can work with others and finish things on your own. Looking for internships is good if there are any.
You might want to be a bit more trendy, or else boring and corporate, but what's really important is that you can pick anything up quickly the first time you see it. So technically, what you actually know right now doesn't matter.
You don't pay taxes on unrealized gains in Australia unless they're in a self-managed superannuation fund and you have over $2 million. Regular investments outside of super are only taxed when you realize the gains. Superannuation is your retirement funds, doesn't seem that relevant to the start-up ecosystem.
