Block Senior Mobile Software Engineer interview questions

Had an initial call with a recruiter and picked the take home interview option. Didn’t get past that after a canned rejection E-mail and the recruiter refusing to forward any feedbacks. Functionality of the app was basic but other technical requirements were quite long. Disk cache, Error Handling, Test. And then for a senior position I figured an extensible architecture, dependency injection and and good adoption of design patterns. Says takes 4-6 hours, I didn’t really keep track. I’d say definitely over 6 hours. Building projects from scratch properly takes time. Functionality often takes very little after a good architecture. I submitted it feeling pretty good given a supposed 4-6 hours constraints. Clean code base, good start to an extensible architecture, etc. But no all I got was a canned E-mail rejection. Upon further enquiry for feedback as I was very puzzle resulted in “I totally understand. However, we are unable to release feedback.” Basically treats candidate like used napkins. Until these practices change I do not recommend anyone wasting their weekend and their dignity on this process