Named clients, not client logos. A logo wall proves a company did something for that brand — it doesn't prove what, or whether it worked. Ask directly what was built, and ask to see it if it's public.
A case study that shows a decision, not just a result. A polished final screenshot tells you a studio can execute. A case study that walks through a problem and a trade-off tells you how they think — which matters more once your project hits its first real disagreement.
Regulatory or compliance experience, if it applies to you. For healthcare or fintech-adjacent crypto work specifically, ask whether the studio has actually navigated an FDA review, a GSA contract, or a compliance audit before — not whether they're willing to learn on your project.
Where the team actually sits. Several companies covered on this site — Clay Global, Mission Control, Inbuco — operate substantially or entirely remote. That's not automatically a downside, but know what you're getting before assuming an in-person relationship.