Sustainable Fashion Platform — B2B Marketplace, UK and EU

Architecture: Next.js frontend, Node.js/Fastify backend, PostgreSQL separate schema per tenant (seller), Stripe Connect for marketplace payments (automatic fee deduction, cross-border transfers), AWS eu-west-2 (UK primary) with EU-specific data processing in eu-west-1 (Ireland) for EU user data. UK and EU GDPR Dual Compliance: Users can be UK or EU-based sellers/buyers. Architecture separates UK user data (processed in eu-west-2, subject to UK GDPR) from EU user data (processed in eu-west-1, subject to EU GDPR). Dual Privacy Notice covering both regulatory frameworks. ICO registration for UK data processing; EU representative appointed for EU data processing. Companies House and EU Business Verification: UK seller verification: Companies House API (real-time company number verification, officer check). EU seller verification: VIES (VAT Information Exchange System) for EU VAT number validation. Automatic suspension for sellers failing verification. Sustainability Credentials: Carbon footprint tracking module: integration with EcoVadis (sustainability assessment) and B Corp API (B Corp certification verification). Sellers display verified badge only when third-party certification confirmed via API.