Ezequiel De Simone, Developer in Tandil, Buenos Aires Province, Argentina
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Ezequiel De Simone

Verified Expert  in Engineering

Full-stack Developer

Tandil, Buenos Aires Province, 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.


HTML5, CSS3, Node.js, Express.js, MongoDB, Amazon Web Services (AWS)...
Next.js, React, TypeScript, Azure, Angular, Responsive, Responsive UI...
JavaScript 6, React, Redux, HTML5, Figma, APIs, CSS3, BrowserStack, GraphQL...




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

Web Development Course Tutor

2019 - PRESENT
  • 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

Senior Front-end Engineer

2023 - 2024
  • Created the Taller.us site from scratch using TypeScript, React, and a call to API.
  • Made the site's design 100% accurate and ensured compatibility with all devices.
  • Developed an internal tool in Angular 12 and created components and new features. Made the site responsive for small and large screens, including 5K.
Technologies: Next.js, React, TypeScript, Azure, Angular, Responsive, Responsive UI, Tailwind CSS, Bootstrap 4

Front-end Software Engineer

2021 - 2023
  • 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 to the flow of Paypal Pay Later and the PayPal Honey plugin.
Technologies: JavaScript 6, React, Redux, HTML5, Figma, APIs, CSS3, BrowserStack, GraphQL, Agile, TypeScript

Front-end Software Engineer

2018 - 2021
  • 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

Magento 2 Software Developer

2018 - 2018
  • 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

Senior Software Development Engineer

2018 - 2018
  • 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

Senior Software Development Engineer

2017 - 2017
  • 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

Senior Software Development Engineer

2016 - 2017
  • Led four front-end team members for an HBO GO Asia for the Philippines and Singapore project. Collaborated with the back-end and mobile 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, Vanilla JS

Software Engineer

2016 - 2016
  • 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

Senior Software Development Engineer

2016 - 2016
  • 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

Magento Developer

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

Software Developer

2013 - 2015
  • 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

Software Developer

2012 - 2013
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

Software Developer

2008 - 2012
  • 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

Software Developer

2011 - 2011
  • Developed software for Brigades.org.
  • Advised and directed development projects remotely.
Technologies: JSON, HTML, Prototype Framework, jQuery, Ajax, JavaScript, PHP 5

Web Developer

2008 - 2009
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, JavaScript, 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.

PayPal Pay Later

I developed new features for Pay Later (Honeypay/PayPal plugin) using React/Redux GraphQL. I updated PayPal UI/npm packages (modified components in React and updated packages).

I also created components to support A11y accessibility. I then incorporated optional chaining and replaced Lodash's library to reduce bundle sizes. I modified the React component to include different functionalities based on mobile native or the Webview app.

Technologies used: React, Redux, JavaScript ES6, CSS3, HTML5,
Webpack, GraphQL, BrowserStack,GitHub, Jira, and Agile methodology (Scrum).

YingHua International School Website

Provided support for the Joomla-based website by crafting new pages, implementing updates to existing content, and enhancing the responsiveness of modals and pop-ups. Additionally, I played a key role in facilitating the smooth transition to our new React-built site.


• Migrated a PHP project to an EC2 instance running LAMP (Linux, Apache, MySQL, and PHP).
• Migrated the DNS management to Cloudflare for improved performance and security.
• Debugged and fixed issues with some legacy code where certain functionalities weren't working as expected.
2012 - 2012

Diploma in Business and Management

Unicen - Tandil

2001 - 2008

Bachelor's Degree in System Engineering

Unicen - Tandil









HackerRank: https://www.hackerrank.com/certificates/6f2303236cf3


React, React Redux, jQuery Mobile, jQuery, jQuery UI, Mustache, Highcharts, Reactstrap, 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, Eclipse IDE, Figma, BrowserStack


HTML, CSS3, HTML5, PHP, SQL, JavaScript, PHP 5, CSS, JavaScript 6, Sass, ECMAScript (ES6), Java, Less, Pascal, XML, GraphQL, ES7, TypeScript


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


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)


WordPress, LAMP, Ubuntu Linux, MacOS, Ubuntu, Magento Community Edition, Amazon EC2, Magento, Joomla, Linux, Windows, Apache2, iOS, Drupal 8, Drupal, AWS Lambda, Firebase, Magento 2, Oracle, Amazon Web Services (AWS), Android, Azure


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


Full-stack, Front-end, Ajax, Graphic Design, eCommerce, Wamp, IAP SDK, Software Architecture, Software Design, Software Development, Algorithms, OOP Designs, Mathematics, Ecology, Economics, Technology, Startups, 3D Animation, 3D Modeling, SOAP, APIs, Custom CMS Development, Cloudflare, Responsive UI, Bootstrap 4

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