Dolphin Beyond
Physics arcade gameA physics arcade game where you ride one dolphin from the ocean to space — an independent, browser-and-iOS homage to the Flash classic Dolphin Olympics.
Halfdan Harring
Full-stack developer from Aarhus, Denmark building apps, web apps, SaaS products and digital tools.
I build practical software products with a focus on simple user experiences, fast iteration and modern development tools. My work spans mobile apps, web apps, SaaS products, AI-assisted workflows and product experiments.
What I build
- Apps and mobile-first products
- Web apps and SaaS platforms
- Firebase and Firestore-based systems
- AI-assisted development workflows
- Digital tools for small teams and businesses
- Product prototypes and MVPs
Featured apps and products
HeadToHead
Sports & gamesA football-focused head-to-head game project built by Halfdan Harring.
LostLead
AI & business toolsAn AI-assisted product focused on helping businesses recover lost leads.
TaskMondo
Productivity & SaaSA business workspace and productivity SaaS product for getting work organised.
Dealer ID
Apps for dealersAn app and product for watch dealers and digital dealer communication.
Quiz Fight
Quiz & triviaA quiz and trivia app for fast, competitive question rounds.
Runish
App projectAn app project in the portfolio of products built by Halfdan Harring.
Official network
This website is the international profile for Halfdan Harring. My Danish website, app portfolio, development site, blog and speaking site are listed below.
- HalfdanHarring.dk
Danish website
- HalfdanHarring.com
International profile
- AppsMedHalfdan.dk
Apps and app portfolio
- HalfdanHarringBlog.dk
Writing on development, AI and software
- JegUdvikler.dk
Web development and digital solutions
- ForedragMedHalfdan.dk
Talks and speaking
Prefer Danish? Visit HalfdanHarring.dk or read the Danish profile page.
Official profiles
Technologies
- React
- TypeScript
- Vite
- Firebase
- Firestore
- Cloud Functions
- Capacitor
- Node.js
- Tailwind CSS
- AI-assisted development
- Cursor
- ChatGPT
Speaking and entrepreneurship
Alongside building products, I speak about software development, AI-assisted product building and entrepreneurship. Danish talks and lectures are collected at ForedragMedHalfdan.dk.
Selected writing
I write about development, AI and building software. You can follow along here: