You can find a mobile app design agency via freelance platforms like TopTal or Upwork. You’ll find UX design experience descriptions, case studies, and customer feedback to help guide your decision. You can also contact design agency representatives to learn more about their talent and availability. LinkedIn and other professional platforms can also yield useful connections, including a mobile app design agency.
Exploring Google search results is also an option. You can browse design agency websites, analyze their portfolios, and view customer feedback. However, this preliminary research stage can be quite time-consuming.