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6 followers · 1 following

Achievements

Achievement: Pull Sharkx3Achievement: QuickdrawAchievement: YOLOAchievement: Arctic Code Vault Contributor

Achievements

Achievement: Pull Sharkx3Achievement: QuickdrawAchievement: YOLOAchievement: Arctic Code Vault Contributor

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Karl-Horning/README.md

Hello, I'm Karl 👋

Backend engineer specialising in Node.js, TypeScript, and SQL, with experience building accessible, well-documented systems used by hundreds of thousands of people worldwide.

My background combines software engineering and education technology, which gives me a strong focus on building systems that are technically robust and genuinely useful for the people who rely on them.

Tech Stack

Languages & Frameworks

TypeScript Node.js React Next.js JavaScript Python Electron

APIs & Data

GraphQL PostgreSQL Prisma Sequelize REST

Testing & Tooling

Postman Mocha Swagger CI/CD

Featured Projects

Learnlight Platform & Mobile Apps

Backend engineering on a global EdTech platform serving 700,000+ learners across 180+ countries. Reduced queries from 36 to 1 on the worst-affected endpoints using DataLoader, cutting resolver response times by up to 70%.

Focus: API performance, backend architecture, developer experience.

Transform Text Extension

A browser extension available on Chrome, Edge, and Firefox — approved first time on all three stores. Built with TypeScript, Manifest V3, and Vitest.

Focus: developer tooling, testing, cross-platform shipping.

KarlHorning.dev

Personal developer portfolio built with Next.js, TypeScript, and Tailwind CSS. Automated accessibility testing with Playwright and axe-core, CI/CD via GitHub Actions, and Lighthouse scores of 99–100.

Focus: accessibility, front-end architecture, developer tooling.

Values

  • Accessibility-first development
  • Clear, maintainable systems
  • Documentation as part of engineering
  • Collaboration and knowledge sharing

Currently

  • Web Developer at King's College London
  • Studying for AWS certifications

Connect

Pinned Loading

  1. transform-text transform-text Public

    A developer tool for coding and writing. Paste text, pick a transformation, and copy the result.

    TypeScript

  2. html-entities-reference html-entities-reference Public

    A searchable reference for HTML named character references.

    TypeScript

  3. macos-gitignore macos-gitignore Public template

    A .gitignore template for macOS users working with Word, Excel, and Affinity apps. Excludes system files, temporary backups, and autosaves while keeping your actual project files tracked.

  4. canvas canvas Public

    A statically exported Next.js documentation site covering HTML and CSS patterns for Canvas LMS course content — headings, tables, layouts, buttons, icons, accessibility, and more.

    TypeScript