Proof over promises
Hire mobile app developers who demonstrate the build
Mobile development brings extra risk: platform quirks, device fragmentation, app-store constraints, and performance under real conditions. Screenshots in a portfolio rarely reveal any of that.
How the challenge works for this category
You give three mobile developers the same brief and 24 hours. Each builds a working screen or flow on a real device or simulator and records a short video demonstrating it running — so you're judging a working build, not a static mockup.
A working screen or flow running on a device or simulator
A screen-recorded video of the build in action
Their proposed approach for native, cross-platform, or hybrid delivery