Structuring a Job Board: Hierarchy, Matrix, or Both

A job board currently organizes listings in a strict hierarchy: Industry → Role Type → Individual Listings (e.g., Technology → Software Engineering → "Senior Backend Engineer at Acme"). Users complain they can't find remote-only listings, or listings under a certain salary, without opening dozens of individual postings to check.

1. Diagnose why the current pure-hierarchy structure produces this specific complaint.
2. What organization scheme addresses the complaint directly, and how would it change the actual UI, not just the underlying data model?
3. Would you replace the existing hierarchy entirely or layer the new scheme on top of it? Justify the choice.
4. What's one risk of the change you'd want to validate with users before shipping it?