Chemify Senior Software Engineer interview questions

Initial chat with the CTO then you get sent a take home challenge (a very unexciting one may I add), where you basically end up slaving away for days to build something to meet an invisible bar they have set to then be rejected if you don't meet it with then zero feedback left second guessing yourself. Waste of time I would stay away. The recruiter also ghosted after I chased asking for feedback.