Ismael Gonçalves Abreu, Developer in Porto, Portugal
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Ismael Gonçalves Abreu

Verified Expert  in Engineering

Software Developer

Porto, Portugal
Toptal Member Since
March 2, 2015

Ismael is a seasoned Ruby on Rails developer who is always looking for new technologies and ways to improve his code. He has worked on many web engineering projects, loves open source, and is proud to have millions of users using his beautifully crafted code.


Glazed Solutions
Git, MongoDB, Redis, PostgreSQL, Knockout (Knockout.js), Sinatra, Bootstrap...
Git, Elasticsearch, Solr, MongoDB, Redis, PostgreSQL, RSpec, Sidekiq...
Waverise Software
Git, Redis, MongoDB, PostgreSQL, Sidekiq, GrapesJS, JavaScript, Sinatra...




Preferred Environment

Git, MacVim, OS X

The most amazing...

...web app I've coded is a high-performance, white-label, localized music streaming service for millions of users.

Work Experience

Software Engineer

2015 - PRESENT
Glazed Solutions
  • Developed Ruby on Rails projects for several international agencies.
  • Architected and developed REST APIs for mobile applications.
  • Worked with worldwide teams using Agile methodologies.
  • Contributed to open source projects and internal libraries.
  • Won the "Most Stack Overflow Answers" competition.
Technologies: Git, MongoDB, Redis, PostgreSQL, Knockout (Knockout.js), Sinatra, Bootstrap, Backbone.js, AngularJS, HTML5, Scala, Ruby on Rails (RoR)

Software Developer

2013 - 2015
  • Implemented multiple features for the back-office, including: editorial management, service configurations, charts, and maintenance tasks.
  • Implemented parts of the API for mobile and desktop clients.
  • Integrated SMS payment and subscription APIs as gems.
  • Created a Ruby gem for accessing the internal catalog service in use at multiple implementations.
  • Created specific Lua scripts for Redis and store procedures in PL/pgSQL and PL/Perl.
Technologies: Git, Elasticsearch, Solr, MongoDB, Redis, PostgreSQL, RSpec, Sidekiq, Knockout (Knockout.js), Sinatra, JavaScript, HTML5, Ruby on Rails (RoR)

Ruby Developer

2013 - 2013
Waverise Software
  • Created a service exposed via API and WebHooks to fetch and broadcast data received via Twitter, Instagram, SMS, and email.
  • Implemented a highly customizable media board with live preview.
  • Implemented multiple features on a Human Resources Management System.
Technologies: Git, Redis, MongoDB, PostgreSQL, Sidekiq, GrapesJS, JavaScript, Sinatra, Ruby on Rails (RoR)

Ruby on Rails Developer

2012 - 2013
  • Created a scheduled publisher to automatically publish content on multiple forums and classified advertisement websites.
  • Created scrappers for multiple websites.
  • Implemented multiple features on eCommerce website.
  • Created an extension for Spree to support a Portuguese payments service using ATM references.
Technologies: Git, MongoDB, PostgreSQL, Resque, PHP, JavaScript, Ruby on Rails (RoR)


Sultn is a music streaming service for the EMEA region.

Meo Music

A music streaming service for the largest Portuguese MNO.


HTML5, CSS3, JavaScript, Ruby, Scala, PHP, Elixir


Knockout (Knockout.js), Sinatra, Ruby on Rails (RoR), Bootstrap, AngularJS, GrapesJS


jQuery, Backbone.js, Twitter API, Facebook API, Resque, Sidekiq, React


Git, MacVim, Solr, RSpec


Object-oriented Programming (OOP), Agile Software Development, Functional Programming


MacOS, Linux, OS X


Redis, MongoDB, PostgreSQL, MySQL, Elasticsearch

2009 - 2012

Master of Science Degree in Computer Engineering

Universidade do Minho - Braga, Portugal