Ignacio Freiberg, Developer in Buenos Aires, Argentina
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Ignacio Freiberg

Verified Expert  in Engineering

Software Developer

Buenos Aires, Argentina
Toptal Member Since
June 28, 2012

Ignacio is a software and web developer with more than twelve years of experience in many programming languages, libraries, and frameworks (both frontend and backend). He enjoys constantly learning and developing new skills, and he is familiar with many different paradigms and technologies.


Node.js, Ember.js
Web Crawlers, API Integration, Unit Testing, PostgreSQL, TypeScript, Node.js
PostgreSQL, Amazon Web Services (AWS), JavaScript, AngularJS, Node.js




Preferred Environment

Linux, MacOS

The most amazing...

...thing I've built is a Node.js app to allow for the sending and receiving of millions of multiple choice questions and responses via SMS.

Work Experience

Senior Full-stack Developer

2020 - 2021
  • Implemented the integration of a new data type in the system, including state regulations coming from a new data source.
  • Contributed to the definition of processes and protocols for optimizing future data source integrations.
  • Managed the team during the final phase of the project as the technical leader and project manager for a short period.
Technologies: Node.js, Ember.js

Senior Back-end Developer

2019 - 2020
  • Developed the integration with various credit card and bank APIs, implementing the client's own integration interface.
  • Developed unit tests, integration tests, and functional tests for different API integrations.
  • Built a web-crawler to satisfy some integration needs with systems which had no available API.
Technologies: Web Crawlers, API Integration, Unit Testing, PostgreSQL, TypeScript, Node.js

Back-end Developer

2016 - 2019
  • Implemented new features and fixed bugs, both in the front end and back end.
  • Worked on periodic operative issues and data fixes while gradually automating some of that work through the development of new tools and scripts.
  • Maintained legacy code while helping with the transition process to new systems, including massive data migration and verification, production services transition, and more.
Technologies: PostgreSQL, Amazon Web Services (AWS), JavaScript, AngularJS, Node.js

Front-end Developer

2015 - 2016
  • Implemented UI/UX designs, including user interactions, animations, and cross-browser compatibility.
  • Implemented the connection to the back-end REST API using the Restangular library.
  • Created a new project structure for new sub-projects within the company, implementing best practices for organized and scalable Angular projects.
Technologies: jQuery, JavaScript, AngularJS

Web Developer

2011 - 2015
GoChime (via Toptal)
  • Built a prototype system with heavy integration with Twitter API and automatic querying and posting based on what Twitter users were sharing in real-time.
  • Designed and built reporting systems for actionable data analysis and client reports.
Technologies: Node.js, JavaScript, PHP

Lead Developer

2012 - 2012
AdWorx (via Toptal)
  • Designed and built a system using CodeIgniter (PHP), implementing the entire business flow (product selection, payment, production, and delivery).
  • Contributed to the definition of the business logic process.
  • Implemented the front-end UI/UX using HTML5, Compass, CoffeeScript, and jQuery.
  • Implemented payments using Paypal Pro (multiple recurring payments and credit card direct payments).
  • Integrated with a brochure design and printing service (mycreativeshop.com).
Technologies: jQuery, Amazon Web Services (AWS), Jenkins, Phing, CoffeeScript, Sass, Compass, CSS3, HTML5, PHPDoc, PHPUnit, CodeIgniter, MySQL, PHP

Lead Developer

2010 - 2012
SmsPREP (via Toptal)
  • Developed Joomla components to allow sending and receiving millions of multiple-choice questions and responses via SMS.
  • Designed and built a smart learning management system (LMS) from scratch.
  • Designed and built an adaptive learning algorithm that continually targets multiple-choice questions according to a current user's difficulty level.
  • Outlined multiple reporting systems for actionable data analysis and business intelligence.
  • Developed the smsPREP API to allow for third-party integration into the system for sites such as Zinch.com and CollegeProwler.com.
  • Designed and built social gaming and social modes for e-learning.
  • Developed Facebook integrations for social learning.
  • Developed and integrated a Kannel SMS Gateway.
Technologies: Node.js, CSS, HTML, JavaScript, Joomla, PHP

Web Developer

2011 - 2011
Circlefy (via Toptal)
  • Developed the prototype of the social network working under the scrum model.
  • Managed the R&D team as a scrum master, defining requirements, PM, and more.
Technologies: JavaScript, PHP

Project Manager

2011 - 2011
Toptal Platform
  • Defined requirements and managed a team of Ruby on Rails developers.
  • Conducted QA/testing.
Technologies: Ruby on Rails (RoR)

Front-end Developer

2011 - 2011
IDEO (via Toptal)
  • Created prototype websites for market testing.
  • Set up Google Analytics and goal tracking to measure their success.
  • Contributed to the UI/UX design process of http://www.sensible.com/ from Steve Krug based on the knowledge of usability best practices.
  • Implemented many variations of User Experience using jQuery and YouTube custom player.
  • Developed basic Flash functions in ActionScript 3.0.
Technologies: ActionScript 3, Flash, jQuery, CSS3, HTML5


2010 - 2010
ConsumerBell (via Toptal)
  • Created a WordPress plugin that allowed clients to post comments about any company, service, or product. The plugin included a “feed” to show the posted comments in real-time. It also had a back end integrated with the WordPress administration panel.
  • Implemented Facebook and Twitter integration.
  • Developed different UI/UX elements using jQuery.
Technologies: JavaScript, CSS, HTML, WordPress, PHP


2009 - 2010
DWP Internet
  • Developed Joomla components and themes.
  • Developed a generic “directory site” and then customized/deployed it to create three websites.
  • Optimized the Mosets Tree component code, increasing site performance by ~200%.
  • Created a web-crawler from scratch using C++/Python.
  • Converted many gigabytes of data into importable SQL, only using a couple of regular expressions.
  • Executed full data mining processes, downloading, parsing, and importing over 400.000 records for three databases.
Technologies: JavaScript, CSS, HTML, Joomla, PHP


GoChime allows brands to leverage their first-party data to run smarter and more unified advertising campaigns across Facebook, Instagram, Twitter, and Google. Brands sync their ESP and CRM platforms to GoChime and can bridge the data that lives there to outside social advertising platforms. GoChime is no longer online; Wunderkind acquired it in 2016.


I worked on the front-end development of a calculator tool that allowed me to input financial information easily and intuitively and then display the most appropriate investment options in a simple comparative table. Unfortunately, this tool is no longer online; this was done many years ago.
2007 - 2015

Bachelor Degree in Computer Science

University of Buenos Aires - Buenos Aires


Node.js, GridFS, OpenCV, Facebook Ads API, Stripe, Backbone.js, Facebook API, jQuery, Underscore.js, API Development, REST APIs, Backbone.Marionette, X (formerly Twitter) API, OpenGL, PayPal API, SendGrid API, React, Marionette.js, jQuery UI, Vue


Adobe Photoshop, Grunt, Gulp, Mongoose, Git, Vim Text Editor, RabbitMQ, Mocha, Subversion (SVN), GitHub, SendGrid, Phing, Jenkins, Flash, ChatGPT


AngularJS, Bootstrap, Express.js, Ember.js, UI-Router, CodeIgniter, PHPUnit, Compass, Ruby on Rails (RoR), Angular


HTML, CSS, JavaScript, Sass, CSS3, HTML5, Bash, PHP, CoffeeScript, C++, Visual Basic .NET (VB.NET), XML, ActionScript 3, TypeScript, C, C#


DevOps, Agile Software Development, Test-driven Development (TDD), UX Design, Object-oriented Programming (OOP), User Testing, REST, Agile, Microservices, Microservices Architecture, Behavior-driven Development (BDD), Event-driven Programming, Management, Unit Testing


MacOS, Linux, Google Sites, LAMP, WordPress, Amazon Web Services (AWS), Joomla, Heroku


MySQL, MongoDB, PostgreSQL, Redis


Computer Vision, Data Mining, Data Analysis, Data Visualization, Brain-computer Interface, Learning Management Systems (LMS), APIs, Facebook Ads, eCommerce, Front-end Development, Architecture, Front-end, Communication, Full-stack, Full-stack Development, PSD to HTML, Natural Language Processing (NLP), Digital Signal Processing, Webhooks, CI/CD Pipelines, Leadership, Software Development Management, Generative Pre-trained Transformers (GPT), PHPDoc, API Integration, Web Crawlers, Artificial Intelligence (AI)

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