Fast forward to the in person meeting, they go through my solution and nitpick random things like "why use NuGet packages" or "why no test cases" (I had written them but they got mysteriously removed from the solution).
Finally the CTO speaks up and asked why I didn't write a GUI, as many other candidates had (mind you this was an application that accepted inputs and ran a calculation). I responded, "it's less effort to write a console application and the assignment said it was acceptable". CTO then snarkily asks me "do you always do the minimum"? I should have snarkily responded "only when I'm asked to code for free".
Thankfully did not get an offer...