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SeDu Oh

Every project

The full list, newest first.

  • Talk532

    Featured

    A realtime chat app with no server of its own

    A chat you enter with a six-character code. There is no server of my own: the browser talks to Supabase directly, so the whole security boundary is a set of RLS policies written in SQL. Realtime covers whoever is online, and an edge function pushes to whoever is not.

    Role
    Solo project — schema, UI and operations
    • Next.js
    • React
    • TypeScript
    • Supabase
    • PostgreSQL RLS
    • Web Push
    Read the case studyLive site — Talk532

  • Atlas

    Featured

    A design system six product teams share

    Forty-odd components with accessibility baked in and dark mode assumed from day one. Change a token once and every product picks it up.

    Role
    Lead — architecture and build
    • TypeScript
    • React
    • Tailwind CSS
    • Storybook
    • Vitest
    Read the case studySource — Atlas

  • Pulse

    Featured

    An analytics dashboard whose first chart lands in under a second

    Rebuilt around streaming rendering and server-side aggregation so millions of event rows still feel instant. LCP went from 4.1s to 1.3s.

    Role
    Frontend owner
    • Next.js
    • React
    • D3
    • PostgreSQL
    • Vercel
    Read the case studyLive site — Pulse

  • tokens-cli

    Ship Figma variables straight to CSS custom properties

    A designer changes a token in Figma and a pull request opens. Built to kill the manual step in our design-system loop, now open source.

    Role
    Solo project
    • TypeScript
    • Node.js
    • Figma API
    • GitHub Actions
    Source — tokens-cli

  • Signal Map

    A live map of how crowded the Seoul metro is

    A weekend project putting an open API onto a canvas map. Rendering is hand-managed to hold 60fps across sixty thousand points.

    Role
    Solo project
    • Canvas
    • TypeScript
    • Vite
    Live site — Signal MapSource — Signal Map

  • One-Step Checkout

    Featured

    Collapsing a three-step checkout into one

    Redesigned the checkout funnel of a 3M-session-a-month store. Validation, payment methods and error recovery all on one screen, for an 11% lift in mobile conversion.

    Role
    Frontend engineer
    • React
    • Redux
    • Node.js
    • Playwright
    Read the case study

  • Campaign Microsites

    Eighteen campaign sites, none below a Lighthouse 90

    Two years of agency brand campaigns. I built shared interaction presets and a build template so each one did not start from scratch.

    Role
    Web developer
    • JavaScript
    • GSAP
    • Three.js