I applied online. Then there was a nice call with HR and a test case. Test case was to build a simple UI with D3.
I usually don't do it but I'll rather spent some time to give a back feedback. From my past experience when I was participating in numerous interviews from both sides I know that a rejection is always hard both for a candidate and for a company. And it's fine when someone is rejected. But I believe that should be always done with a respect. When I was rejected after the test assessment I would expect to get a normal explanation. From my point of view I spent couple of evenings on providing of the working solution that is using the same tech stack as Konux, follows visual and architectural design principles, is responsive for different screen size, covered by tests, optimized for development and build etc. and then getting just the reason "no scalable" is at least not fair. When someone in my team states something like that he usually provides arguments and there is a discussion. And he may convince his opponent or may not. But this is how professional software development works.
UPDATE: There was a call after my feedback with a detailed feedback.