Javier Loffredo, Developer in Villa Ballester, Buenos Aires Province, Argentina
Javier is available for hire
Hire Javier

Javier Loffredo

Verified Expert  in Engineering

Software Developer

Villa Ballester, Buenos Aires Province, Argentina
Toptal Member Since
April 24, 2018

For the past decade, Javier has been working as a professional developer. He loves working on projects that challenge him and where he can learn new things. Javier mainly develops in PHP using the Symfony framework (lately using 5) and MySQL as the database server.


Freelance Work
jQuery, PHP 7, Symfony, Symfony 3, MySQL, PHP, HTML
Modern Asset Management Inc.
PHP, CSS, HTML, JSON API, JSON, Financial Analysis, Loans & Lending...
Soluciones y Desarrollos Informáticos S.R.L.
PHP 7, Symfony 3, MySQL, PHP, HTML




Preferred Environment

Git, PhpStorm, Linux

The most amazing...

...project I've worked on (and still work on) is a site for a local tabletop games community in Argentina; I developed a whole CMS with gamification capabilities.

Work Experience

Web Developer

2017 - PRESENT
Freelance Work
  • Created a CMS with gamification for local boardgame community in Symfony 3.4 with PHP.
  • Developed an API with an integration with different systems and databases in Symfony 3.4 with PHP.
  • Built a CMS for a local company in Symfony 3.4 with PHP.
  • Worked on a local crowdfunding project for innovation technologies with multiple subsystems based on different project types and contests. in PHP, Symfony 2.8 and MySQL.
  • Implemented improvements on an e-learning platform for local schools with multiple schools, subjects, and exam types. Used Symfony 1.4 with the database on DB2; currently, I'm migrating the database to Oracle.
Technologies: jQuery, PHP 7, Symfony, Symfony 3, MySQL, PHP, HTML

Full-stack Developer

2022 - 2022
Modern Asset Management Inc.
  • Refactored the legacy code into the new Symfony framework using PHP 8 and MySQL8.
  • Integrated a third-party API into the client's system.
  • Documented a third-party API into a Postman project for the client to run tests in both sandbox and production.
Technologies: PHP, CSS, HTML, JSON API, JSON, Financial Analysis, Loans & Lending, Consumer Loans, AutoPal API


2013 - 2017
Soluciones y Desarrollos Informáticos S.R.L.
  • Developed a resource control monitor for Bosch oil machines (PHP, Symfony 2).
  • Built an Android app to check certain sites availability (JAVA).
  • Created a mobile client for Bosch's resource and control monitoring.
  • Developed Augmented Reality App for android for company christmas card using JAVA, Android Studio a Vuforia AR.
  • Improved and updated budgeting system based on SugarCRM (Migrated to SuiteCRM) synchronized with SAP R3 Database.
Technologies: PHP 7, Symfony 3, MySQL, PHP, HTML

Technical Manager

2010 - 2013
  • Managed projects and coordinated staff.
  • Developed intranet sites in PHP (Symfony 2 Framework).
  • Developed Budget system within SugarCRM with synchronization with an MSSQL database from an ERP. In PHP and MySQL.
  • Developed Price estimation for company in the graphic industry contemplating different Client categories and local taxes. in PHP 5.6 and Mysql.
  • Developed production and warehouse order generator from data obtained from local ERP. in PHP and MySQL.
Technologies: MySQL, PHP

System Administrator and Tech Support

2004 - 2010
  • Developed a price control app in PHP.
  • Customized a SugarCRM. (PHP 5 and MySQL).
Technologies: PHP


I designed and developed the back end, front end, and REST API to take orders and arrange the retrieval and delivery of card codes to Shopify customers. This included fraud analysis via Nethone's API. In using Symfony, I prepared the site for multi-store usage.

API for Slyde

I developed and documented the API and back-end operations for the ACH payment platform. I also helped design the API and interaction with third-party services such as SILA. API handles multiple user/business levels, KYB and KYC validations, recurrent payments, among other functionalities.

Geek Out!

This site was built for a tabletop community in Argentina. I developed this CMS site (specifically the back end) with user gamification, log plays, a load game library, and a feature where you can gain experience points and achievements.

Shopping Cart and Quote System with Multiple Integrations

PHP Shopping cart was integrated in the .NET site. Quote generation, shipping calculation was done with FEDEX and Liftgate, Integration with GleanView CRM for analytics, storing quotes, and orders. Did tax calculation using Avalara API.


PHP, PHP 7, CSS, HTML5, JavaScript, HTML


Symfony 2, Symfony, Symfony 3, Symfony 4, PHPUnit, Bootstrap 3


Twitter API, Meetup API, Google API, Facebook API, jQuery, Shopify API, JSON API, REST APIs, AutoPal API


PhpStorm, Git






APIs, Financial Analysis, Loans & Lending, Consumer Loans