No, the shein website is not using Shopify. It is based on Nginx technology.
Hope it helps! Please let me know of any further concerns.
This is Song Fei from trackingmore app which is an "track my order" app for shopify store.
Shein use our order parcel tracking api. And we help them to integrate our tracking api. I won't tell you things about there tech, but they didn' use shopify .
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