Doug Sparling - Freelance Ruby Developer for Hire

Android/Back-end Developer

2015 - PRESENT

MBLSFT (via Toptal)

Added complex features and fixed bugs in several existing Android apps. Either designed new features myself or worked with a designer supplying mockups.
Created and documented a Node.js-based SSL server, with full integration test coverage, to push email to Android-based clients and receive email via a REST API or SMTP.
Added broadcasts and new message notifications, and made reliability improvements to a secure instant messaging server written in Go.
Added endpoints to a CoffeeScript and Express.js based REST API.
Configured Atlassian Bamboo for testing and continuous delivery of various servers.
Created and supported a Dropwizard-based PGP gateway with user key management.
Added at-rest encryption of data to various Android apps, with secure key management.

Technologies: Android SDK, Go, CoffeeScript, Node.js, Protocol Buffers, SMTP, TCP

Consultant

2014 - 2015

Manitoba Telecom Services (via Protegra)

Built an Android app for a local telecom to show customers their data usage, bills, and notifications, to enable bill payments, and more.
Implemented several asynchronous REST calls using Retrofit, including multi-level caching of results, an offline mode, and sophisticated error handling.
Used Node.js to mock client web services for testing purposes.
Wrote a detailed developers guide for hand-off to the application maintenance team.
Executed and wrote test cases for a variety of Android phones and coordinated fixes with QA.

Technologies: Android SDK, Node.js

Consultant

2011 - 2014

Manitoba Blue Cross (via Protegra)

Mentored many new staff on the effective use of Hibernate, Spring, and Java.
Designed and implemented rich JavaScript-driven interfaces with the help of analysts for editing and viewing complex insurance information.
Helped design and develop a JSON REST web service to provide data from an ODS.
Built batch processes to perform billing, exporting to legacy systems, and letter printing.
Aided in the creation and extension of common utility libraries for internal use by dozens of projects and developers.
Created and delivered presentations on functional programming, best practices, design patterns, and test-driven development.

Technologies: Java, Hibernate, Spring, JavaScript

Programmer, Analyst

2006 - 2011

Winnipeg Transit

Added new features to a Swing application to allow transit controllers to monitor real-time locations of GPS-enabled buses, create and view incident reports, and communicate with bus operators.
Designed, implemented, and supported an Oracle-based ODS containing transit service information, supplemented by an in-memory store of real-time data.
Architected and helped with the implementation of a Rails-based website redesign to deliver real-time service information to customers.
Helped create an integration REST web service using Java and Cocoon. Developed a Ruby gem for consuming the service from internal Rails apps.
Introduced continuous integration with Jenkins, artifact management with Nexus, simplified building and deployment with Maven, and version control with Git.
Pushed for the introduction of Ruby on Rails to the organization and succeeded. Trained existing Java developers for the transition.

Technologies: Ruby on Rails, J2EE, Scala, Hibernate, JMS, Swing

Winnipeg Transit Website (Development)

http://winnipegtransit.com

I was a principal developer on Winnipeg Transit's website redesign, which launched in 2009. It is built with Ruby on Rails with a Java back-end, and displays real-time schedule information to hundreds of thousands of transit customers.

MTS MyAccount Android App (Development)

https://play.google.com/store/apps/details?id=ca.mts.myaccount&hl=en

I was one of two developers on the small team that built the Android version of this app for MTS, a telecommunications company. It allows customers to view and manage their account, pay bills, monitor data usage on their devices, and more. It has received a 4.5/5 rating so far.

Full Text Search of Dialogues with Apache Lucene: A Tutorial (Publication)

https://www.toptal.com/database/full-text-search-of-dialogues-with-apache-lucene

Apache Lucene is a powerful Java library used for implementing full-text search on a corpus of text. With its wide array of configuration options and customizability, it is possible to tune Apache Lucene specifically to the corpus at hand - improving both search quality and query capability. This article gives us a glimpse of the simplicity and ease of customization of the Apache Lucene analysis pipeline.

Toptal Mentor

Doug is a mentor in the Toptal Global Mentor’s Program. This program is a partnership between Toptal and General Assembly to provide high quality mentorship for students from minority and low income backgrounds who are looking to begin their careers as professional software engineers. Doug shows commitment to diversity in tech by mentoring a General Assembly student every week for a year, covering everything from coding tips and tricks to advice on making it in the industry.

Languages

Java, SQL, Haml, CoffeeScript, Go, JavaScript, Ruby, SCSS, PHP, Scala, CSS, HTML

Frameworks

Hibernate, Android SDK, Ruby on Rails (RoR), Express.js, Apache Struts, JSP, Spring MVC, Swing

Paradigms

Test-driven Development (TDD), Agile Software Development, Socket programming, Continuous Integration (CI), REST, Concurrent Programming, Database Design, Continuous Delivery (CD), Functional Programming

Libraries/APIs

jQuery, Apache Lucene, Q promises, Node.js, Retrofit, Reactive Extensions, JMS, Underscore.js, Cocoon, React

Tools

IntelliJ IDEA, Maven, Jenkins, Mocha, Git, Subversion (SVN), Gulp.js, Jetty, GIS, Bamboo, JIRA, Ansible, Apache, Gradle, Ant

Platforms

Android, Linux, Oracle, Windows, Heroku

Storage

MySQL, VoltDB, PostgreSQL

Other

Protocol Design, Cryptography, Protocol Buffers, TCP, SSL, API Design, Content Management Systems (CMS)

Bachelor's degree in Computer Science, Philosophy

2002 - 2007

University of Manitoba - Winnipeg, Canada