Dan Halliday

Independent technologist & designer based in London.

Partner at Swagger.

Dan sketching in a notebook

Over fifteen years, I’ve founded several active technology companies, and worked as technical director and consultant to many more. From visual design and user experience through full stack web development to apps and low level programming — if it’s interesting, I’m interested.

If you’re working on something good, I want to be the first to hear about it. Just introduce yourself.

Selected Work

Closeup of the ace of spades

Smashing Magazine

Magic Flip Cards

  • Accessibility
  • CSS
  • HTML
  • Responsive
  • Web

I wrote for Smashing Magazine to introduce a more robust implementation for animated flip cards.

Audio visualiser running on mobile device

DST Innovations

Wireless Audio Visualiser

  • Accelerate
  • Audio Units
  • Bluetooth
  • C
  • DSP
  • Documentation
  • Node.js
  • Swift
  • iOS

I built an iOS app for DST Innovations to serve as a controller for their prototype multimedia fashion product.

Printed software development kit documentation


Mobile Text-to-Speech Library

  • API Design
  • CocoaPods
  • Documentation
  • React Native
  • Swift
  • iOS

I wrote an iOS SDK for SpeechKit to give their customers an easy way to add podcast content to their apps.

Bold red soundwave logo

Soundry Co

Brand Identity & Artwork

  • Brand Art
  • Logo
  • Stationery
  • Typography
  • Web

I created a bright and bold visual identity to set this modern engineering outfit apart from their competition.

App running with code in background


Multichannel Streaming Server

  • Audio Units
  • C
  • C++
  • Objective-C
  • Opus
  • Swift
  • iOS
  • macOS

I created macOS and iOS apps for RIMMS TV to enable their users to hear custom live audio mixes on set.

Bright pink treble clef shaped logo

Cantare Ladies’ Choir

Combination Mark & Style Guide

  • Design Documentation
  • Logo Design
  • Print Design

I worked with this group on a combination mark that would tie their brand together, complete with usage documentation.

Wedding invitation postcard

A Happy Couple

Wedding Stationery Pack

  • Print
  • Typography

A modern, elegant stationery pack, with a few extras such as a map for the day and a list of local attractions for guests to browse.

Bright yellow modern app design

EarSoft Audio

Interactive Audio Player App

  • Icons
  • Interactive
  • Mobile
  • Prototyping
  • Responsive
  • User Experience

I designed and built a unique audio player app for EarSoft that tailors sound to the listener’s environment and mood.

Selected Writing