Don't let it stop you from continuing to apply for jobs. If you have written a Django/Angular site from scratch you are more than qualified for a junior position.
Unfortunately the people interviewing are often going to be life-long employees that are expert of climbing the corp ladder, not so much the entrepreneurs who found and own the business.
Because "how do we know you didn't copy paste it from a tutorial and claim it as yours?"
It is insulting, and frankly discouraging. As if the only one true way to tell whether you know your stuff or not is to check if you can solve some silly riddle/puzzle under the gun.
One solution is to only apply to companies without a broken hiring process, but sadly they're very rare.
I'd hire that guy, but maybe that's why I'm looking for employment and not the employer? LOL
That sounds a bit harsh.
Unless you're going for a role that requires some kind of explicit/specific knowledge - and you're clearly not able to demonstrate any skill in that area - I wouldn't put too much stock in the interview processes of Unicorns actually being indicative of your true skill.
I've been told, during an interview, that I was clearly incompetent and the interviewer terminated the interview. This was because I stumbled on doing a series of whiteboard exercises to solve some obscure brain-teasers.
I ended up getting the job anyway (I had worked with people there, and they vouched for me) and learned that to many of the interviewers, they found great delight in finding the most obscure and weird problems, trick questions and coding challenges.
It didn't help with selecting for competency, and the product the company was shipping wasn't exactly ground breaking or needing of someone who could on the spot solve arcane bullshit.
But it seems they want people that have studied for months and probably have seen the problem before, so they can go thru all the possible optimizations and come up with the best answer in 45 minutes. Basically they are hiring an 'Interview Cracking Engineer'. Not a developer...
I thought it used to be that they look at your resume and they ask you questions to confirm that your resume is real. And that's that. Now it's basically just an exam, period...