30 minutes phone screen followed by a take home technical assessment. Scope of the project was to find insights in enterprise transaction data using any language/presentation. Estimated to take ~4 hours. After providing a work sample the recruiter said they would take a look and get back to me. They never responded, despite a brief follow up inquiry a week later. It isn't uncommon or unprofessional for a company to go silent on a candidate they're not interested in, however it is unprofessional to ask a candidate to work a few hours for you and then not provide them any feed back at all.