Iurii Uses: #E-commerce

EU VAT Rates for WooCommerce — WordPress Plugin

WordPress plugin that keeps WooCommerce EU tax rates current from the European Commission and applies the B2B reverse charge from a VIES-verified VAT number at

pi-pi.ee — Live Custom-Colour Preview

Recolour a product photo to any colour in the browser, instantly — an SVG duotone filter tints transparent master images on the fly, so a shop can offer

pi-pi.ee — B2B E-commerce for Waterless Urinal Systems

i18n B2B e-commerce platform for waterless urinal products across 32 European countries with automated VAT handling, PDF invoicing, and CRM integration.

Pikkuna — i18n RAG AI System

RAG system on OpenAI and Upstash Vector with 30 language support. Includes streaming chatbot, hybrid search (semantic + keyword), AI ticket classifier, and

Pikkuna — E-commerce for Vinyl Curtains & PVC Products

International e-commerce platform with 30 locales, product configurators, AI chatbot, and fully automated order flow: Stripe → Zoho CRM → Airtable → Mailgun →

B2B quote-to-order flow in Next.js: an RFQ → quote → order state machine, per-deal line items, guarded status transitions, and converting an accepted quote

Prevent overselling under concurrent checkouts: reservations vs hard decrements, SELECT FOR UPDATE, deadlock-safe multi-line carts, and the payment window.

Gated B2B pricing in Next.js: per-account price lists, server-side access control so prices never leak to crawlers, and a deal-record data model where every

Subscription billing edge cases Stripe glosses over: proration, dunning, the state machine, cancellation timing, refunds, VAT, and webhook ordering.

Add AI to an existing product without a rebuild. Three integration patterns, how to pick the right one, and what production-ready AI actually demands.

How to build a React product configurator with Zustand state, DaisyUI components, Motion animations, and live SVG preview — architecture, pricing logic, and

PostNord API and Zoho Desk automation for EU e-commerce: gotchas to watch for — 200 OK empty arrays, EU data center URLs, token caching — with illustrative

Production transactional emails with React Email and Resend: PDF invoice generation via react-pdf, Vercel Blob temporary storage, and BullMQ Stripe webhook

E-commerce order automation that cut 160+ hours/month of manual work to zero: Stripe webhook to VAT invoice and tracking in under 2 minutes.

EU VAT validation in Next.js: VIES caching with Redis, three-state results, reverse charge logic, and audit logging — what actually works in production.

Next.js i18n for 30 languages in production, not a 2-locale demo: next-intl routing, type-safe translations, hreflang at scale, and the formatting traps the

RAG chatbot for e-commerce: resolve 70% of support queries across 25 languages — ingestion pipeline, hybrid search, confidence thresholds, and streaming UI.

Server-side GA4 and Meta CAPI in Next.js to recover the 30–50% of conversions adblockers and iOS hide from you.

Puppeteer vs @react-pdf/renderer for Node.js PDF generation, decided by production use, not benchmarks: which survives Vercel's serverless limits, which