Iurii Uses: #E-commerce

EU VAT Rates for WooCommerce – WordPress Plugin

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

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.

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.fi – i18n RAG AI System

RAG system on OpenAI and Upstash Vector in 30 languages, with a streaming chatbot and hybrid search (semantic + keyword).

pikkuna.fi – E-commerce for Vinyl Curtains & PVC Products

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

Headless ecommerce buys you a custom storefront, complex pricing and B2B flows – at the cost of a build and ongoing maintenance.

Off-the-shelf platforms like Shopify and HubSpot are the right call for most businesses – until they block the way you actually work.

B2B quote-to-order flow in Next.js: RFQ → quote → order state machine, per-deal line items, guarded transitions, and quote conversion without data drift.

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 and server-side access control so prices never leak to crawlers.

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.

Build a React product configurator with Zustand, DaisyUI, Motion animations and a live SVG preview – architecture, pricing logic, and performance patterns.

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

Production transactional emails with React Email and Resend: PDF invoices via react-pdf, Vercel Blob temporary storage, and BullMQ Stripe webhooks.

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 and hreflang at scale.

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.