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

Senior Community Services, CareNextion

I was approached by SCS to design & build 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.

Deb Taylor, CEO, Senior Community Services
Tony was instrumental in helping us design, develop, and launch CareNextion.org. He coached us on various technical issues, and guided us through to launch of our first-ever software development project. We're thrilled with the end result! Deb Taylor, CEO, Senior Community Services

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.


  • Elixir/Phoenix
  • Ruby/Ruby on Rails
  • Modern Javascript/ECMAScript
  • RESTful APIs
  • Web Application Design & Architecture
  • 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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