If you’re building a mobile-first product, Brains & Beards is the most consistent React Native shop we’ve evaluated. They work exclusively with funded startups (pre-seed and above) and maintain a strict team-to-client ratio — no more than 6 active engagements at a time.
US founders benefit from strong async communication practices and a -1 to +1 timezone band depending on coast. Their design capability is particularly strong — every engagement includes a product designer embedded in the team, not bolted on.