Start small, then expand
Mobile-first means designing for the hardest constraints first: a small screen, an impatient thumb and a flaky connection. When the core journey works there, expanding to desktop is easy. Doing it the other way round — shrinking a desktop site — is how you get pinching, zooming and rage-quits.
Four rules from our builds
- Primary actions live in the thumb zone — bottom half, reachable one-handed.
- Design offline and empty states first; travelers, drivers and warehouses have no signal.
- Set a performance budget (we use 200KB initial JS) and fail the build when it breaks.
- Test on real mid-range devices, not just the latest flagship in the office.
Prototype before you commit
On our travel app, testing a clickable prototype with 18 travelers caught a checkout misunderstanding that would have cost weeks to fix in code. A week of prototyping routinely saves a month of rebuilding — the cheapest tests are the ones with paper and taps.
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