Past experience, skills, your recent work, questions about C++

The most important one for them: Home Assignment (2nd round) They will give you a technical design problem which you will need to implement in 7 days with the language of your choice. The problem which they had given was not a simple program but a whole application. They will also give you a validator application to validate your application if it is working fine as per their standard (which you have no idea of about where it failed). On my system that validator didn't work. Then they had 'n' number of requirements that needed to be implemented. Just like a user story but without the sprint planning, so you can understand the pain I went through. Plus when you design an application you talk with others, there are design discussions and whatnot. So they are expecting a production-grade application from your side without considering the thought process that goes into that when you are building one. I had written the application code in just 2 days but it failed validation on their side and I have know idea what went wrong. Except an email stating that it failed. I deserved a chance to know which validation it has failed and which design principles did I miss. To everyone, you can skip all this, and please apply to some other company where design and code discussions are done face to face (skype/zoom/office). Assignments do make sense (I have given many), but they should check your language level and if you can code. That's it. About logical thinking and others can be tested face to face.