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photo info Taken above Altadena in the Angeles National Forest – probably from the Eaton Saddle Trailhead, with Mt. Markham on the right.
© Irina V, ID 116107603

Patrick Reagan doing business as
D3 Tools

My passion is to work with small and medium sized business to translate their business needs into elegant data tools. I've been designing and developing custom data tools since 1996 – first with Walt Disney Television Animation, where I headed a small software engineering team responsible for production database application development. In 2004 I turned to contracting and consulting using FileMaker software as my primary development environment.

Formerly operating as Deodar Designs Data Tools, the name was shortened to D3 Tools in 2014, before it was clear how significant the d3 JavaScript library would become. (Please don't be mad at me Mike!)

My primary focus switched from FileMaker to open source development tools in 2017 in order to offer more power, control and cost-savings for ambitious systems.


Especially strong in the entertainment industry, my work has supported a wide range of groups:

  • - animation production
  • - customer relationship management
  • - event floor plans
  • - executive call tracking
  • - human resources
  • - IT equipment and task management
  • - facilities management
  • - factory production timing
  • - museum patron relationship
  • - recording studio operation
  • - warehouse inventory

Freelance and Consulting Services...

  • - Skillful business rule discovery
  • - Quickly understandable screens
  • - Easy and effective visual controls
  • - Focused reports
  • - Egoless construction
  • - Management design perspective

...Open Source

  • - JavaScript development
  • - Express API's
  • - React.js apps
  • - PostgreSQL


  • - New database/app systems created
  • - Existing systems adjusted
  • - Integration with other applications
  • - Mobile device access
Image from Altadena hills at night