Quantum Energy

The task: to bring online a full range of heating equipment - bimetal radiators, electric radiators, breathers, water heaters, heated floors, thermostats - with filters for comparing technical characteristics and a checkout that serves both the retail buyer and the FOP or LLC with VAT. Solution: store on OpenCart 3 with two language versions uk/ru and correct hreflang. In checkout — monobank, cash on delivery, cash on delivery and non-cash account for FOP and LLC with VAT; delivery by Nova Poshta, Myst-Express, Delivery and pickup in Kharkiv. GTM and GA4, Google Maps, Telegram, Viber, WhatsApp messengers have been connected. The result (measured on 07/31/2026): 3,565 product cards in the live catalog — counted by regular OpenCart page-by-page search; first server response — 525 ms, full HTML — 663 ms with 296 KB of markup; in checkout there are 4 payment methods and 4 delivery methods.