A personalised mobile platform aggregating second-hand retail shops under one digital roof to promote eco-friendly shopping.
Building the 6M+ Item Second-Hand Aggregator & Data Platform
The Challenge
This platform began as a basic search tool for second-hand goods, with no accounts, watchlists or personalisation. It needed to centralise and search product data from 200+ stores and over six million items, add secure accounts and tailored recommendations, calculate and clearly show the CO₂ and water saved by buying second-hand, and move from a web search tool to a fast, personalised iOS and Android experience.
What We Did
We ran alignment workshops to design user management, a personalised recommendation engine and secure authentication, then implemented Firebase accounts and a tailored onboarding flow that captures category, brand and size preferences. A recommendation engine prioritises pinned items, watchlists and personal taste, backed by notifications, while Lucene-based search was scaled to stay fast across 6M+ items. We also integrated real-time CO₂ and water-saving data on product pages, turning sustainability into a visible reason to buy.
The Impact
How We Delivered
A full-cycle mobile and backend squad - product and UX design, React Native mobile engineers, Java/Spring Boot and Lucene search engineers, and dedicated QA for search performance and data security.
Inside The Build
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