2. Designing the Core Feature: From my experience, a common pitfall in mobile projects is focusing on secondary features first, which detracts from the primary purpose. Our app had a clear, singular goal, which was its main value proposition. Users would only be able to join the matching pool by taking and sharing real-time, front-and-back photos with their phone cameras. To encourage consistent engagement, the shared photos would have a limited lifespan. Our main focus here was to deliver this core feature seamlessly, ensuring it felt natural for users and left no room for security issues.