D. Simmons

Frontend engineer — interfaces, design systems, and the glue between product and production.

Built to be remembered in one scroll.

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Focus
React · Next.js · design systems
Availability
Open to senior roles

Selected work

Anonymized case studies from real workflow, data, platform, and delivery problems.

  • Cross-platform web delivery

    Web platforms

    Built and maintained websites and web applications across CMS, ecommerce, visual-builder, low-code, and custom JavaScript environments.

    • React
    • Next.js
    • Node.js
    • CI/CD

  • Multi-store shipping matrix workflow

    Internal tooling

    Built a Python and PostgreSQL tool that centralized shipping-table imports, postcode parity checks, versioned snapshots, and approved API syncs.

    • Python
    • PostgreSQL
    • APIs
    • Workflow UI

  • Supplier compatibility import system

    Full-stack app

    Built a staged import and matching workflow for inconsistent supplier CSVs, combining validation, canonical lookup, human review, and persistence.

    • Next.js
    • TypeScript
    • SQLite
    • Zod

  • Local component preview environment

    Developer tooling

    Built a local preview app for registered code components, shortening the edit-preview loop and reducing manual upload-preview cycles.

    • Components
    • Local dev
    • Preview UI
    • DX

How I work

I treat the interface as the argument. Typography, motion, and state design are how you prove you understand product — not a deck of buzzwords.

Typical engagements: greenfield product UI, design-system hardening, performance and accessibility passes on flows that already ship revenue.

You get semantic HTML, measured contrast, keyboard paths, and motion that respects prefers-reduced-motion — because hiring managers notice when those are missing.

Let's build something sharp.

Open to full-time and contract roles. Tell me what you're shipping and where the UI is blocking velocity.

hello@simmons.dev