Halogen Labs

Web & Mobile App Development

Hi there! My name is Tony Collen, and I'm a freelance web developer based out of Minneapolis/Saint Paul. I'm a full-stack developer, which means I'm comfortable working from the frontend, (slinging HTML, CSS and Javascript), all the way to the backend (managing databases, integrating with third-party APIs, deploying apps, managing servers).

A picture of Tony

How I Can Help

Custom App Development

I've been building the web for over a decade. Whether it's a more "traditional" webapp, or you're looking for something a bit more mobile, I can help transform your idea for an app into reality.

Process Consulting

I can help train & mentor your team, observe & locate process ineffeciencies, and make recommendations to improve your day-to-day workflow. I can also recommend specific tools to improve your delivery to customers.

GIS/Mapping apps

Location is everything. I've got tons of experience building geo-enabled mapping apps with Google Maps, PostGIS, LeafletJS, and MapBox.

API Integration

Apps that exist in isolation aren't very interesting! Whether it's building a service for other apps to use, or integrating with third-party APIs, I can help get your systems talking to each other.

Clients & Projects


I was approached by Senior Community Services to design & build them a custom new web application for coordinating in-home care teams.

I worked closely with a UX designer to design, develop & deliver a brand new web application for SCS according to their needs.

Immersion Data Solutions

I worked with Immersion Data to re-architect an existing legacy application. This included planning, designing & building a brand new web application with an eye towards responsive design.

This project had a large GIS/mapping aspect to it. The back-end was built with Ruby on Rails, and the front-end was developed "single-page app" style with Backbone.js & Marionette.

Flat Rock Geographics

Webapp & API integration. Worked closely with 3rd-party vendors to sync data between systems, and I also managed to contribute some fixes back to an open-source project as well.

RoundTable Projects

Custom webapp design & development. I worked closely with a UX designer and the project owners to gather ideas & requirements, and turn it all into a working app.

The Informatics Group

Website development & custom API integration.


  • Ruby/Ruby on Rails
  • HTML5/CSS3
  • Javascript
  • jQuery
  • RESTful APIs
  • Web Services
  • Web App Design
  • AngularJS
  • Backbone/Marionette
  • Responsive Design
  • Postgres
  • PostGIS
  • LeafletJS
  • Google Maps

Contact Me

If you've got a project you need help with, or even just want to bounce some ideas off me, get in touch! I'm always up for a chat.

Fill out my online form.
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