How do you ship consistent, high-performance mobile UIs across iOS, Android, and Web - without slowing your teams down? For us at Allegro, this question quickly became a daily reality, forcing constant trade-offs between performance and iteration speed, native quality and cross-platform reach, flexibility and long-term maintainability. Along the way, it led us from our own internal solutions to an unexpected open-source challenger — and to rethinking how we build mobile interfaces at scale.