Let's build the mobile version first, then think about the web version.
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移动端 vs PC端 (PC / desktop) vs 网页端 (web) vs 客户端 (app client) — these are the four sides Chinese tech teams talk about when scoping a product. 端 here means 'end' as in 'client end'.
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Tech and product-team jargon. Common in Chinese job posts (移动端开发工程师 = mobile developer), product reviews, and any 互联网公司 (internet company) chat.