TradePost Marketplace App
A cross-platform mobile marketplace for second-hand goods — built offline-first for low-connectivity markets and launched to 40,000 active users in its first three months.
The Challenge
Target users were on low-end Android devices with intermittent 2G/3G connectivity. Competitor apps were slow, data-heavy, and crashed frequently — leaving a significant gap in the market for something that actually worked reliably.
Our Approach
We built the app with React Native and Expo, but the architectural centrepiece was the offline-first sync layer — every listing browse, save, and message is queued locally and synced when connectivity allows. Images are compressed aggressively on-device before upload. The initial APK came in under 2MB.
The Outcome
Rated 4.7★ on the Play Store at launch. 40,000 active users within 90 days. Zero reported crashes in the first month due to offline handling.
“They understood our users better than we did after two weeks of research. The offline-first approach wasn't our idea — it was theirs. It's the single most important technical decision in the product.”
SBSamuel Byaruhanga
Founder, TradePost Uganda
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