What are you working on? The name of the project(s): Happy Color Genres: Application Platforms: Mobile X-FLOW is a mobile game development company established in 2018. We gained recognition after the release of Happy Color , the most popular digital coloring book and one of the most successful ad-driven mobile apps in the world. We take pride in our diverse and talented team and partners, spread across the UK, Cyprus, the Netherlands, and other regions worldwide. We are looking for a Flutter De…