[highCs]

If one understand decently all of that, does he get a job?

[DrNuke]

Supply-demand dynamics at play. The general answer is no, though. Chances are higher if you use these in your own domain and become an applied expert or if you win some competition on Kaggle or similar tough envinronment.

[lisivka]

If you will be able to debug all that, you will get a job.

[tnecniv]

Which is way harder than it sounds.