[Archelaos]

I don't know about the job market in Russia, so my perspective may not dircetly apply to your situation.

In my experience, smaller companies might be more for you. The job positions are often more versatile and varied. I imagine you are more likely to find a job there where you can combine SWE with your DS knowledge and still like it. In such companys your tasks typically require you to solve real business problems all the way through, for example: "We have some sales data. Can you write us a tool that helps us decide where to focus our marketing efforts?"

But firstly, as others have pointed out, since you already invested a lot of time into DS, finish your degree as fast as possible, and then take the opportunity to build a portfolio (even if it is pure DS) and a professional network to help you find a better job. I do not think that it should be too difficult to transition into SWE with a DS degree; and after a few years of professional activity, no one is interested in what you have originally studied anyway.