I once interviewed with a startup that disguised their technical-onboarding as the last step of the interview process. Learn three different frameworks, unlist

I once interviewed with a startup that disguised their technical-onboarding as the last step of the interview process. Learn three different frameworks, unlisted in the job description, and extend a github repo, suspiciously similar to their production codebase. That they insisted what was easily a 10-hour assignment could be done in 30 minutes "if you're already familiar", made it seem like they were offloading the learning-on-the-job to before-getting-an-offer. Cunning, but ultimately a sign not to sign.