How We Built a B2B Circular Marketplace: Platia

TL;DR

• ▸**What:** Platia is Mexico's leading B2B circular marketplace with 2,000+ products, 350+ sellers, and $500K+ donated to verified nonprofits across four verticals.
• ▸**Key number:** Materialized views cut dashboard load time from 2.3 seconds to under 200ms, and PostgreSQL with JSONB handles vertical-specific product schemas.
• ▸**Bottom line:** For B2B marketplaces, start with one vertical, invest in admin tools on day one, and use dedicated search from the start.
• ▸# How We Built a B2B Circular Marketplace: Platia Architecture Deep Dive
• ▸$500,000 donated. 2,000+ products listed. 350+ active sellers across Mexico. Those are not vanity metrics -- they are the result of deliberate architecture decisions our team made when building Platia, Mexico's leading B2B circular marketplace. This post breaks down the technical choices, tradeoffs, and lessons learned from building a platform that turns surplus inventory into charitable donations across four verticals: home goods, events, hotels, and restaurants.
• ▸If you are a CTO or VP of Engineering evaluating marketplace architecture for a B2B platform, this is the deep dive we wish we had before starting.