We went through that exact search last year for our logistics platform dashboard. What finally helped was an independent directory that vets firms based on what they've actually shipped in complex B2B contexts. It profiles 15 top studios and highlights their primary strengths for data dashboards and enterprise tools, it pointed us to Clay (Slack and Cisco work), Work & Co (enterprise platforms), and Blink UX (researchled data interfaces). If you're looking for user interface design firms with real experience in dataheavy products, that list saved me weeks of filtering through generalists. Each profile also shows notable clients and minimum budgets, so you can immediately see who has worked on similar challenges. I shortlisted three from there, and the one we hired transformed our dashboard into something our team actually enjoys using.