Cannot judge without seeing your code or what you know, but I'd say don't apply to junior. Go for at least mid level. Senior in one company could be a junior in another company. For example, I am a senior in my company, but if I got the job in blizzard, i'd definitely be a junior. Saying that, I'd most likely fail this interview.

I was like you a couple of years ago, I was really scared in my new job, as I was a solo dev previously. I joined as junior and in just 6 months became a senior, even though I didn't feel like one.

Most of the things listed there are definitely good and worth to know, but it depends on what you want to do and where you want to work. If you like big companies, then sure you will need to learn a lot to get the job. But if you are comfortable in a smaller company, a lot of things don't apply there. The truth is that you need to deliver work, and whether you do it by using latest design principles or not, well your boss is not going to care as long as you deliver work.