Guilherme Fernando Ferreira, Developer in São Paulo - State of São Paulo, Brazil

Guilherme Fernando Ferreira

Software Developer

São Paulo - State of São Paulo, Brazil
Toptal Member Since
January 20, 2014

Guilherme is an Agile developer with a BS in Computer Science. He is a passionate programmer with over 10 years of experience in Ruby, JavaScript, Python, PHP, Java, and more. He has spoken at conferences including Campus Party, Agile Brazil, and Agile Tour.

Guilherme is available for hire
Hire Guilherme


HTML5, CSS3, jQuery, JavaScript, CakePHP, Sinatra, Ruby on Rails (RoR)
Objective-C, Ruby on Rails (RoR), HTML, CSS, JavaScript, SQLite, MySQL, PHP
NTS Info
CSS, HTML, JavaScript, MySQL, PHP


São Paulo - State of São Paulo, Brazil



Preferred Environment

IRBs, Zsh, GitHub, Git, Vim Text Editor, Xcode, Sublime Text, OS X

The most amazing...

...thing I've coded is a REST web crawler service to collect data about bids provided by many Brazilian government entities.

Work Experience

2011 - 2014

Software Engineer

  • Developed a tool to increase the performance of web site requests with features such as create sprite images and compress/obfuscate JavaScript and CSS files.
  • Worked on a financial control system for small companies using CakePHP and MySQL.
  • Supported the migration of all projects from SVN to Git.
  • Implemented Gitlab, a tool to control Git repositories and allow for easy management of project creation and access.
  • Reworked a deploy tool to use Git instead of SVN and covered with unit tests.
  • Implemented a REST web crawler service using Sinatra to collect data about biddings provided by various Brazilian governmental entities.
Technologies: HTML5, CSS3, jQuery, JavaScript, CakePHP, Sinatra, Ruby on Rails (RoR)
2009 - 2011

Web Developer

  • Worked on a flexible system to search and purchase flight tickets using PHP, JavaScript, and MySQL.
  • Worked with a small MVC framework written in PHP.
  • Developed a logistics management system in PHP and MySQL.
  • Developed a retail system in PHP integrated with the logistics system.
  • Developed an easy to use RSS reader for iPhone and iPad (Objective-C).
  • Coded back-end logic in Ruby to collect all RSS data and send notifications to iOS devices.
  • Created a client to the RSS reader in Ruby on Rails.
Technologies: Objective-C, Ruby on Rails (RoR), HTML, CSS, JavaScript, SQLite, MySQL, PHP
2005 - 2007

Web Developer

NTS Info
  • Developed institutional web sites using HTML, JavaScript, and CSS.
  • Implemented a web system in PHP to control software updates.
  • Developed a tool in Java to migrate Firebird databases to MySQL.
  • Developed websites in PHP with features including an events calendar, photo galleries, and blog posts.
  • Developed a tool using PHP and JavaScript to upload and manipulate images.
Technologies: CSS, HTML, JavaScript, MySQL, PHP



Developed back-end logic and a migration tool to collect data from many Firebird database files and centralize all data under the MySQL server. I also developed iOS and Android apps for this project.



PHP, Ruby, JavaScript, Clojure, Java, Objective-C, CSS, HTML, CSS3, HTML5, Python


Ruby on Rails (RoR), Sinatra, CakePHP


jQuery, ImageMagick, Watir WebDriver


Git, Capistrano, Sublime Text 2, Zsh, Vim Text Editor, Cucumber, RSpec, Sublime Text, Xcode, GitHub, Adobe Photoshop, Adobe Illustrator


Test-driven Development (TDD), Agile Software Development, Extreme Programming, Pair Programming, Scrum


MacOS, Linux, iOS, OS X, Android


SQLite, PostgreSQL, MySQL


Web Crawlers, IRBs


2008 - 2011

Bachelor's Degree in Computer Science

Pontifícia Universidade Católica de Minas Gerais - Poços de Caldas - Minas Gerais