I just completed this exact challenge (Yes, for Sennder) and I think their challenge is fine. It is not really difficult or takes much time at all. They didn't

I just completed this exact challenge (Yes, for Sennder) and I think their challenge is fine. It is not really difficult or takes much time at all. They didn't seem too strict in their review and I was able to discuss some of the "mistakes" and choices I made in the tech interview. Including some PEP8 violations. Despite these mistakes I passed the tech interview just fine and I just have the CTO interview left. I don't see how mocks would have doubled the scope of the project. I think I have mocks set up in a few lines of code or so. If your project is so difficult to test or if it is difficult to set up mocks for it maybe there is a serious flaw in your project structure? > Providing an HTML response rather than JSON when the spec asked for a "page, don't bother about styling". I don't understand what you mean with this. Did you provide a HTML response or did you provide JSON? I did a super simple HTML response with no styling and that was fine. If you did JSON I could see how they would mark it as a mistake when they clearly asked for a HTML page.