Ezequiel De Simone, Developer in Tandil, Argentina

Ezequiel De Simone

Full-stack Developer

Tandil, Argentina
Toptal Member Since
May 6, 2013

Ezequiel is a seasoned software developer who has created software for many well-known companies, including HBO GO, WWE, Orbitz, and EA. He has also worked as a freelance project leader and developer specializing in website development. He excels in a wide range of modern technologies.

Ezequiel is available for hire
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HTML5, CSS3, Node.js, Express.js, MongoDB, Amazon Web Services (AWS)...
JavaScript 6, React, Redux, HTML5, Figma, APIs, CSS3, BrowserStack, GraphQL...
Amazon Web Services (AWS), Jira, GitHub, Jenkins, Highcharts, MongoDB, Webpack...


Tandil, Argentina



Preferred Environment

JetBrains, iOS

The most amazing...

...software I've created is a program that uses a custom backtracking algorithm for a Backgammon game.

Work Experience

2019 - PRESENT

Web Development Course Tutor

  • Reviewed the content of each unit and corrected students' assignments for each unit.
  • Taught students about the technologies they are learning.
  • Taught good coding practices and helped to develop a basic page, an API in Node.js, a SPA in React and React Native, and so on.
Technologies: HTML5, CSS3, Node.js, Express.js, MongoDB, Amazon Web Services (AWS), AWS Lambda, Test-driven Development (TDD), Behavior-driven Development (BDD), React, Redux, React Native, jQuery, Firebase, GitHub
2021 - 2023

Front-end Software Engineer

  • Created components to support A11y accessibility. Incorporated optional chaining and replaced Lodash's library to reduce bundle sizes.
  • Modified the React component to include different functionalities based on mobile native and web view apps.
  • Made modifications and improvements in the flow of Paypal Pay Later and plugin PayPal Honey.
Technologies: JavaScript 6, React, Redux, HTML5, Figma, APIs, CSS3, BrowserStack, GraphQL, Agile
2018 - 2021

Front-end Software Engineer

  • Created the new analytics portal (https://reflektion.com/modules/#analytics) using and adapting the Highcharts library from scratch. Customized components to fit customer needs. Created everything necessary in Redux to get the components working.
  • Created new components and fixed bugs in the code. In most of the cases, I connected the pieces created with Redux and a call API based on Node.js.
  • Performed integration and unit tests using TDD best practices.
Technologies: Amazon Web Services (AWS), Jira, GitHub, Jenkins, Highcharts, MongoDB, Webpack, HTML5, CSS3, JavaScript, Redux, React
2018 - 2018

Magento 2 Software Developer

  • Developed custom modules to interact in the proccess of how to show the package product.
  • Worked on modifying the theme to a front-end equal to the new template.
  • Set up and replicated the environment in my machine and created a staging environment to not break anything in the production environment.
Technologies: Agile, Scrum, Jira, GitHub, HTML5, CSS3, ECMAScript (ES6), jQuery, jQuery UI, JavaScript, Magento 2
2018 - 2018

Senior Software Development Engineer

  • Developed features for wwe.com with front-end technologies and Drupal.
  • Developed a microsite using new technologies such as Gulp and Webpack. (http://www.wwe.com/wwenetwork).
  • Implemented A/B testing in the network landing page and integrated it with the main site.
Technologies: Agile, Drupal, Gulp, Webpack, Sass, HTML5, CSS3, jQuery, JavaScript
2017 - 2017

Senior Software Development Engineer

  • Developed the site for ReelzTV from scratch. ReelzTV is a platform similar to Netflix.
  • Developed a web app for Amazon Fire TV using IAP API for web apps and requested the service from our API developed in C#.
  • Architected and developed the client-side front end.
  • Developed some new features and fixed bugs for the Reelz website.
Technologies: IAP SDK, HTML5, CSS, jQuery, JavaScript
2016 - 2017

Senior Software Development Engineer

  • Led four people in front-end team for an HBO Go Asia for the Philippines and Singapore project. Collaborated with the back-end and mobiles iOS and Android teams.
  • Created the site from scratch. Designed the site based on logical functionality in HBO Europe and replicated the design from the US site, putting in some custom functionality.
  • Recommended some changes in the API to retrieve the correct information on the front-end side.
Technologies: Amazon Web Services (AWS), HTML5, Sass, jQuery, JavaScript, Bower, Gulp
2016 - 2016

Software Engineer

  • Helped with specific issues on Magento Community 2.1. most of them about the visual aspect.
  • Fixed some functionality using some plugin integrations.
  • Redesigned/refactored the look and feel on the front-end side.
  • Implemented and used Agile methodologies.
  • Reviewed the website's responsiveness, testing this on different mobiles and browsers.
Technologies: jQuery, JavaScript, Sass, CSS, HTML, MySQL, PHP, Apache, Linux, Magento
2016 - 2016

Senior Software Development Engineer

  • Developed software front ends. The project involved back and front-end technologies wrapped on Drupal modules and themes.
  • Created the front end of the new website.
  • Helped the UX designer make the design compatible with Drupal 8.
Technologies: Drupal 8, jQuery, Prototype Framework, JavaScript, CSS, HTML, MySQL, PHP, Apache, Linux
2015 - 2015

Magento Developer

  • Launched ammo.com. Redesigned the old site (ammo.net) and created new functionality.
Technologies: HTML, CSS, PHP, Magento
2013 - 2015

Software Developer

  • Developed software end to end for APIGEE. Worked with XML, Java, JavaScript, and Python to add extra functionality in the RESTful API to obtain the behavior that clients expect.
  • Developed and refactored all sites for the Discovery company to make them responsive using WordPress 3.8.
  • Developed using the Tizen wearable app SDK for the Piksel company using HTML5, CSS3, jQuery Mobile, and Android.
Technologies: PHP, CSS3, jQuery Mobile, JavaScript, HTML5
2012 - 2013

Software Developer

Summa Solutions
  • Developed the Cinsay eCommerce platform.
  • Built a website.
  • Migrated the K-Swiss website (http://img.kswiss.com/) from Magento 1.9.0 to
Technologies: Mustache, Bootstrap, jQuery, Slim, SOAP, REST, PHP, Magento
2008 - 2012

Software Developer

  • Worked as a quality engineer in the US for Orbitz (www.orbitz.com), a leading travel agency. Used Qlikview Software to show company metrics as well as QED internal site development in Ruby on Rails.
  • Performed component testing of OrbitzHosts through app isolation using MockObjects. Created test cases using Java, JMeter, Selenium, RIDE, AccuRev, Python, Batch, and other tools promoted by Orbitz.
  • Developed an API for Google Buzz using PHP and Agile Methodology (http://code.google.com/intl/es-ES/events/io/2010/about.html).
  • Worked as a contractor for playdom.com. Migrated Facebook and MySpace games to the Playdom site.
  • Fixed software issues for Sisertel.
  • Worked as a consultant for Riverwood (http://www.riverwoodcapital.com). Migrated the company website from a static site to a dynamic site. Administered the website using a CMS (Joomla!). Developed the site using HTML and JavaScript for fast information retrieval.
  • Used WordPress to develop a car insurance website (www.carinsurance-choices.com). Adapted WordPress by building and installing various plug-ins, giving it CMS-like functionality. Used LAMP as the main development environment, as well as JavaScript and CSS.
  • Used the LAMP platform, the Symfony framework, and Agile Methodology to create a microcredit website for Planet Finance.
  • Performed technical analysis for a future social website project named VendorBooks. Migrated the current site developed in Joomla 1.0 to Joomla 1.5.
  • Developed administrative website functionality for Fonalix.
Technologies: PostgreSQL, Ruby on Rails (RoR), Selenium, Java, WordPress, Joomla, Symfony, XML, JSON, REST, Ajax, CSS, jQuery, JavaScript, HTML, PHP, MySQL, Apache, Linux
2011 - 2011

Software Developer

  • Developed software for Brigades.org.
  • Advised and directed development projects remotely.
Technologies: JSON, HTML, Prototype Framework, jQuery, Ajax, JavaScript, PHP 5
2008 - 2009

Web Developer

W3 Comunicación S.R.L
  • Worked as a web developer for a number of well-known companies, including McDonalds, BMW, and Citibank.
Technologies: MySQL, Joomla, Smarty, JSON, Ajax, JavaScript, HTML, PHP



Developed a website for Palm.com based on templates/design using Smarty, PHP, MySQL, CSS, JavaScript, and HTML technologies.
I acted as a software developer, working with two more developers to build the website from end to end.

Citibank Puerto Rico

Created with HTML, CSS, and JavaScript.

Citibank Chile

I helped to develop the website for Citibank's Chile branch.


Built on Drupal, jQuery, CSS, and HTML.


A Smarty template.


A Joomla-based website.


A website built on Joomla.


A Joomla-powered site.


A site built on WordPress.

Riverwood Capital

A website developed in HTML5.


A website built using the Zend framework.


I built this website's administrative features using Magento.


A web shop built on Magento.

Planet Finance Group

Built using the Symfony framework.

A Discovery Company

Development and refactoring of all the sites to make them responsive. It is developed in WordPress 3.8 and deployed in AWS.

FW:Thinking | A Discovery Company

A HowStuffWorks site.

Stuff to Blow Your Mind | A Discovery Company

A HowStuffWorks site.

Stuff of Genius | A Discovery Company

A HowStuffWorks site.

CarStuff | A Discovery Company

A HowStuffWorks site.

BrainStuff | A Discovery Company

A HowStuffWorks site.

Stuff You Missed in History Class | A Discovery Company

A HowStuffWorks site.

Stuff They Don't Want You to Know | A Discovery Company

A HowStuffWorks site.

Stuff Mom Never Told You | A Discovery Company

A HowStuffWorks site.


Development the front-end of HBO GO Asia's sites for Hong Kong, the Philippines, and Singapore.

Warnerbros Website

I developed the front-end of Warnerbros' new website, largely in Drupal, and helped the UX designer conform the design to Drupal 8.

Software Engineering Consultancy

For this website, I helped with issues on Magento Community 2.1, fixing functionality with some plugin integrations and also an issue with the front-end view.

Technologies used: Linux, Apache, PHP, MySQL, HTML, CSS, Sass, JavaScript, jQuery

Important patterns used: MVC, Factory, Singleton, Registry, Observer, Agile (Scrum)

ReelzTV Web App

Developed from scratch in JavaScript, HTML5, and CSS for Amazon Fire TV using IAP API for Web Apps in C#. Also included new features and bug fixes.


Developed front-end features using HTML5, CSS3, Sass, JavaScript, and Drupal. Also developed a micro-site, implemented A/B testing for the landing page, and integrated the testing with the main site.


Developed front-end features (HTML5/CSS3, Sass, JS, WebPack, React, Redux) and created functionalities for posts (WordPress). I also installed WP plugins to integrate images in S3 Bucket with Imgix.


Developed custom modules and fixed bugs in production for this website, as well as contributed to requirements on the front end.



HTML, CSS3, HTML5, PHP, SQL, JavaScript, PHP 5, CSS, JavaScript 6, Sass, ECMAScript (ES6), Java, Less, Pascal, C++, C, XML, GraphQL


Scrum, Agile, Responsive, Responsive Coding, Procedural Programming, Object-oriented Programming (OOP), Agile Software Development, REST, Functional Programming, Test-driven Development (TDD), Behavior-driven Development (BDD), Asynchronous Programming, Class-based OOP, Unit Testing, Search Engine Optimization (SEO)


Bootstrap, Slim, Prototype Framework, Symfony, Selenium, Redux, Express.js, React Native, Smarty, Android SDK, Ruby on Rails (RoR), Zend Framework, Foundation CSS


React Redux, jQuery Mobile, jQuery, jQuery UI, Mustache, Highcharts, Reactstrap, React, Node.js, Tizen Wearable, Facebook API, Google API


GitHub, Jira, Sketch, NPM, Gulp, Adobe Photoshop, PhpStorm, Apache, JetBrains, Bower, Jenkins, Webpack, Bower Front-end Dependency Manager, Cordova Plugins, Canva, Adobe Dreamweaver, C++Builder, Eclipse IDE, Figma, BrowserStack


WordPress, LAMP, Ubuntu Linux, MacOS, Ubuntu, Magento Community Edition, Amazon EC2, Magento, Joomla, Linux, Windows, iOS, Drupal 8, Drupal, AWS Lambda, Firebase, Magento 2, Oracle, Amazon Web Services (AWS), Android


MySQL, Amazon S3 (AWS S3), MongoDB, Memcached, JSON, Cache, PostgreSQL


Full-stack, Front-end, Ajax, Graphic Design, IAP SDK, Software Architecture, Software Design, Software Development, Algorithms, OOP Designs, Mathematics, Ecology, Economics, Technology, Startups, 3D Animation, 3D Modeling, SOAP, APIs


2012 - 2012

Diploma in Business and Management

Unicen - Tandil

2001 - 2008

Bachelor's Degree in System Engineering

Unicen - Tandil




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