Diego Ferreyra, Developer in Córdoba, Cordoba, Argentina
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Diego Ferreyra

Verified Expert  in Engineering

Software Developer

Córdoba, Cordoba, Argentina
Toptal Member Since
January 24, 2013

Diego is an established software developer who has created successful apps and websites for a number of companies. He is a self-taught programmer with in-depth knowledge of a variety of web and mobile technologies. He has built game engines, phone applications, websites, and JavaScript apps.


Highcharts, JavaScript, TypeScript, Angular, GitHub, Front-end Development...
Angular, Material UI, Google Maps API, GitHub, TypeScript...
Angular, Bootstrap, GitHub, TypeScript, Front-end Development, Material Design...




Preferred Environment

Visual Studio, MacOS

The most amazing...

...software I've built is an isometric ActionScript 3 game framework on which future applications can be built.

Work Experience

Enterprise Web UI Developer

2020 - 2023
  • Developed core features for a web application that puts critical data at your fingertips to support management, engineering, and operational decisions within the wastewater collection system.
  • Tracked and fixed bugs using the Azure tracking environment.
  • Collaborated with the back-end engineers to connect and improve the API.
Technologies: Highcharts, JavaScript, TypeScript, Angular, GitHub, Front-end Development, REST APIs, Material Design, Front-end Architecture

Angular Engineer

2020 - 2020
  • Optimized maps for real-time marker updates and tracking for over 5,000 entities.
  • Combined markers to show more advanced information, like type and direction, while moving.
  • Improved and optimized components to avoid issues and help readability.
  • Solved several performance issues with the company's Angular app.
Technologies: Angular, Material UI, Google Maps API, GitHub, TypeScript, Front-end Development, Front-end Architecture

Front-end Angular Developer

2019 - 2020
  • Handled all front-end development on a pre-started project and continued working and improving on it as the single developer.
  • Improved the site to be mobile-first ready. Made sure all templates worked on tablets and phones.
  • Created a small JSON parser for dynamic form creations.
Technologies: Angular, Bootstrap, GitHub, TypeScript, Front-end Development, Material Design, Responsive Design, Front-end Architecture

Front-end Developer

2018 - 2019
Sage Bionetworks
  • Developed and maintained the site using Angular 7.
  • Built a force chart in D3 for gene network viewing.
  • Developed and optimized a bar chart in DC for gene RNA values.
  • Stored the gene network in MongoDB with Express.js API management.
  • Processed data transforming gene links into force network data.
Technologies: Angular, DC.js, D3.js, MongoDB, Node.js, GitHub, Front-end Development, REST APIs, Material Design, Responsive Design, Front-end Architecture

Full-stack JavaScript Developer

2017 - 2018
Trinity Mobile Networks
  • Optimized Google Maps to host and update 10,000+ markers in real time.
  • Developed several AngularJS features on the main portal.
  • Implemented portal unit testing with Mocha and Chai.
  • Implemented an ES6 transpiler for the AngularJS portal.
Technologies: Google Maps, Node.js, AngularJS, GitHub, REST APIs, Material Design

Ionic Developer

2017 - 2017
Visio Green (via Toptal)
  • Developed the application from scratch, choosing to implement ES6 into an Ionic project that come out to worked really well and take advantage of it.
  • Developed the project and its architecture from scratch.
  • Turned wireframes into screens.
  • Optimized information management across the platform.
Technologies: Firebase, ECMAScript (ES6), AngularJS, Ionic, GitHub, REST APIs, Responsive Design

Senior Front-end Developer

2016 - 2016
Lystnr.com (via Toptal)
  • Developed a pixel-perfect landing page.
  • Added new features to the AngularJS app, turning links into editable fields.
  • Added new endpoints to the AngularJS app.
  • Created new form templating.
Technologies: CSS, HTML5, AngularJS, Front-end Development, Responsive Design

Front-end Developer

2016 - 2016
Pampered Chef (via Toptal)
  • Developed several apps in Angular 2.
  • Improved templates for the client's main site in HTML5 and CSS.
Technologies: Angular, Webpack, ECMAScript (ES6), GitHub, TypeScript, Front-end Development, Material Design, Responsive Design

Full-stack Developer

2016 - 2016
Heal (via Toptal)
  • Developed the client's portal web app from scratch.
  • Set the architecture for the new AngularJS site.
  • Turned wireframes into a working site.
  • Helped with some UI/UX decisions.
Technologies: AngularJS, JavaScript, GitHub, Responsive Design

Full-stack Developer

2015 - 2016
Fapl (via Toptal)
  • Worked along the CEO developing the main site and mobile app.
  • Helped with the back-end implementation, suggesting and researching better and more secure methods.
  • Implemented a secure file upload with Amazon S3.
  • Developed several sections of the mobile and web app, which were both based in AngularJS.
Technologies: Amazon S3 (AWS S3), Express.js, Node.js, Ionic, AngularJS, GitHub, Responsive Design

Web Developer

2015 - 2015
  • Used new frameworks like AngularJS and Ember.js.
  • Specialized in CSS and responsive design.
Technologies: JavaScript, GitHub, Front-end Development, Responsive Design

Full-stack JavaScript Developer

2014 - 2015
  • Worked with a Node.js back end for managing connectors and on the front-end side with a custom JavaScript framework. Got the opportunity to contribute to an ACE editor while working on Kidozen.
Technologies: JavaScript, REST APIs

JavaScript Developer

2012 - 2013
  • Worked with a custom framework.
  • Had a great experience working in an Agile environment.
  • Led the team and interviewed new developers.
Technologies: JavaScript

Mobile Developer

2011 - 2012
Blanco Martin & Assoc.
  • Designed and developed a number of Android and iOS mobile apps using HTML5.
  • Implemented a RESTful API during development of the apps.
  • Made UI/UX design decisions.
Technologies: PhoneGap, JavaScript, CSS3, HTML5

UI Developer

2011 - 2012
  • Developed a one-page JavaScript application for Intel AppUp using several different frameworks, including Ember.js, YUI, Backbone.js, and Node.js for the back end.
  • Created a travel web page for AmEx using JavaScript, HTML5, and Ruby. The site included a vacation planning page, which gives users the option of booking hotels, flights, cars, and various travel packages.
  • Developed SKL, a flash cards game for Facebook. Wrote the interface and data management aspects using ActionScript 3.
Technologies: CSS3, HTML5, PHP, JavaScript

ActionScript 3 Developer

2006 - 2010
  • Developed a number of highly interactive sites and games using Flash, including RPG, action, and graphic adventure games.
  • Created an entire ActionScript 3 framework for isometric games.
  • Designed and coded several websites using HTML, CSS, and JavaScript.
Technologies: ActionScript 3

Web Developer

2003 - 2005
  • Built dynamic websites from scratch using Flash and XML for several companies.
Technologies: Microsoft Access, Active Server Pages (ASP), ActionScript 2


I was the solo front-end developer here in charge of creating and maintaining the entire site. The application was built using Angular 6 and Bootstrap for mobile-ready functionality.


Angular application for the studies of brain genes related to Alzheimer's.


Developed the front end of a patient portal from scratch using AngularJS. They introduced me to the John Papa Angular style guide, which was really interesting and helped improve my skill.

Fapl, Co.

Worked with the team on the early stage of the web and mobile app development.

I worked really close to the CEO and was able to participate in the architecture of the apps really actively.

Pampered Chef

Worked on several projects with Angular 2. I was new to that technology, but learned a lot during the process.

I also helped on templates to improve the main site.


Developed the new landing page and added new features to the existing Angular app.


Developed on AngularJS and built responsive adaptations.

Swyp Card

Developed the landing page.

Intel AppUp

I was involved in the development of several Intel AppUp prototypes. This involved implementing an MVC design and writing APIs using Node.js and MongoDB. I also wrote code for the front end using the Ember, YUI, and Backbone.js frameworks. Additional work included a number of UI/UX bug fixes, as well as using Redmine to track and address bugs in the code.

AmEx Travel

I wrote the front-end UI for the travel portion of the AmEx website using JavaScript, HTML5, and CSS3. Its features include infinite scrolling for hotel search results as well as an API for the Ruby back end.

To-do App | Backbone and SlimPHP Framework

This project features a user-friendly to-do app that uses Backbone.js on the front end and the SlimPHP framework for the API and back-end services, creating a well-structured, user-friendly, and high-performance application.

MindSmack Madness

This is a high definition company promotion website that behaves like an interactive movie. I was the sole developer on the project and implemented an object-oriented approach in ActionScript 3 that included lazy loading, preloading, and video streaming features.


This is a website for which I wrote the front-end code using HTML5, CSS3, and Flash.


This is a web page for cooking recipes that I developed using Flash, ActionScript, and an XML parser.

Portal Vecino

This is an Android and iOS mobile app that I developed from scratch using PhoneGap with HTML5, CSS3, and JavaScript. It uses a SugarCRM back end and allows users to upload road traffic tips. It also includes a geolocation feature.

Water Collection Systems Data Collection and Analysis

I spent over three years developing an app using the latest Angular framework. I created new features and did bug fixing and optimizations on an ever-growing app that included GIS maps, charts, and a lot of data analysis tables.
2004 - 2007

Bachelor's Degree in Multimedia Design

La Metro - Cordoba, Argentina


jQuery, RxJS, Google Maps, Highcharts, Google Maps API, Backbone.js, Node.js, RequireJS, D3.js, Google Maps JavaScript API 3, Google Maps API (GeoJSON), REST APIs, DC.js, Handlebars, JavaScript API for Chrome, React, Stripe, Stripe API, NgRx, NgRx/store


Git, Slack, Gulp, Bitbucket, GitHub, NPM, Confluence, Webpack, Sublime Text, Angular CLI, Atom, Grunt, Mercurial, Microsoft Access, Visual Studio, Jira, Adobe Photoshop, Adobe Illustrator, Sketch, AWS CodeCommit, Pixelmator, Figma


Bootstrap 3+, Bootstrap 3, Bootstrap, AngularJS, Angular, Angular Material, Material UI, JavaScript MVC, PhoneGap, Ionic, Express.js, Next.js, Svelte


SCSS, CSS, Sass, CSS3, JavaScript, HTML5, HTML, ECMAScript (ES6), TypeScript, Less, PHP, ActionScript 3, ActionScript 2, Active Server Pages (ASP)


Agile Software Development, Responsive, BEM, Event-driven Programming, Unit Testing, Search Engine Optimization (SEO), Asynchronous Programming, Object-oriented Programming (OOP), Design Patterns, Mobile Development, Prototype-based OOP


JSON, Amazon S3 (AWS S3), MongoDB, MySQL, SlimPHP


MacOS, Firebase, Azure

Industry Expertise



Angular Bootstrap, Vine API, Mega, Front-end, Front-end Development, Cordova, Angular Component Architecture, Full-stack, Google Maps Styling, APIs, API Integration, Data Visualization, Material Design, Responsive Design, Front-end Architecture, PSD to HTML, Yam, Illustration, Web UI

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