Hua-I Yu
Full-stack developer shipping production Next.js systems.
New to Contra
Hua-I is ready for their next project!
Interactive derivative explorer. The SVG rendering and mathematical typesetting engines are written from scratch, with no third-party maths libraries, because nothing off the shelf could do draggable tangent lines with live symbolic differentiation.
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High-school mathematics platform built solo: three volumes, 17 chapters, 147 sections, 351 worked examples and 17 custom interactive tools. Separate teacher and student views from one codebase.
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A website the client maintains themselves. Content lives in Notion; they edit in an interface they already know, click one link, and the site rebuilds and goes live in about two minutes. Solves the real long-term cost of a website: needing a developer to change a phone number.
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Multi-tenant SaaS running in production for a 16-campus tutoring chain: 476 active students, 63 users, five department modules. Tenant data is isolated with PostgreSQL row-level security, not application-code checks. Next.js · TypeScript · Supabase · Vercel.
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