I applied online for a remote only job. The next day i received a link to a coding test. You have to implement exactly one member function of a class. You have 9h time, but 3-4h are more than enough, if you're used to this problems. There are some restrictions and they must be fullfilled. These restrictions are not heard of by too many self declared c++ experts, but if you ever heard of the "gang of four", you know what they want. You can submit exactly 2 times. First time you get some hints, but no direction where you failed. after the second submit, you get the hint what test category failed with some examples. I failed with exact one restriction and it was the example... If i was more used to it, it would take me 3h. First submit around 5h with pauses and almost only reading cppreference. If you work in your current job on these topics, 1h is more than enough.... with tests. The coding page says, even before starting, that you should use an IDE with the outdated g++ 7.20 on C++17 that you want. I just used VSCode in WSL with a newer g++, but checked my code in godbolt to be 100% sure it compiles also on g++ 7.2.0. I can just say, write proper tests for your code. Don't assume your types work with your restrictions, prepare your environment prior. In the end I failed, but I can definitly say, it is possible, not "trivial" as the text says, but it's also more than doable. In the context of the salaries, it is even somehow easy.

After spending hours to do a test - they reject the application without even bothering providing feedback (and that despite the fact the test was well done and passing all the tests) - that is not a professional behavior and lacks respect for the time people invest in the process.