I'm a mod on Reddit's /r/cscareerquestions, and we get questions like this so often that we created a specific weekly "Big4" thread to address them. Even if yo

I'm a mod on Reddit's /r/cscareerquestions, and we get questions like this so often that we created a specific weekly "Big4" thread to address them. Even if your BS in SW had been heavy on math, it wouldn't likely matter much now that several years have passed where you haven't used that education. As others have said, practicing for the type of interview you'll be subject to at these companies is probably a better plan than taking a bunch of online courses. My concern is that you seem to equate "solving real problems" with only a handful of companies, and it turns out that those companies are somewhat known to all have this particular interview style which will require you to memorize algorithms and data structures (even if you won't use those skills on a daily basis at that job). Essentially, you're talking about taking a few months to prepare for the interview that most entry-level candidates with "Big4" aspirations prepare for after graduation. Another option would be to consider whether there are other companies solving real problems (of course there are), and whether or not these other companies would subject you to the same style of interview (probably not). Other companies won't interview the same way, and still solve big problems. I'm not sure if this is something you'd considered, but thought I'd throw it out there.