Tomas Casas, PHP Developer in Córdoba, Cordoba, Argentina
Tomas Casas

PHP Developer in Córdoba, Cordoba, Argentina

Member since December 20, 2013
Tomas is a software engineer with a passion for problem-solving. He's had the opportunity to work with OOO and functional paradigms. For the last 15 years, Tomas has been doing web applications using PHP and JavaScript. He then focused on JavaScript for SPA and moving and redesigning a React SPA using ClojureScript. He has been a contractor for US-based companies, corporations, and startups for over 10 years.
Tomas is now available for hire




Córdoba, Cordoba, Argentina



Preferred Environment

GitHub, Visual Studio Code (VS Code), React, MUI (Material UI), Create React App, Webpack, Node.js, Microservices, Docker, Kubernetes

The most amazing...

...things I've developed are a SQL tokenizer to filter and sort in-memory objects and a pop-under by injecting code to a new about blank tab.


  • Senior Software Engineer

    2020 - 2022
    • Collaborated with the front-end team in creating and supporting a components' library, CRA, and Next.js apps. Deployed CRA apps as static assets served from GCP storage. The Next.js app was deployed to Heroku.
    • Transitioned all FE repositories into a single mono repository for easier code reuse.
    • Designed and crafted the billing microservice for Shopify's usage-based charges using routers, handlers, and DAOs.
    • Learned a lot about the MS ecosystem with Docker images running in Kubernetes containers in GCP. Collaborated with the front-end team in creating and supporting components' library and CRA and NextJS apps.
    Technologies: Create React App, Webpack, Next.js, Node.js, MUI (Material UI), Docker, Kubernetes, Google Kubernetes Engine (GKE), Docker Swarm, Docker Hub, Redis, MongoDB, PostgreSQL, Microservices, WebSockets, CSS3, HTML5, GitHub, Design Patterns, Business Requirements, Amazon Web Services (AWS), CircleCI
  • UI/UX Developer

    2014 - 2020
    • Migrated the leading site from React and Redux to CLJS using Reagent and reframed together with Material UI.
    • Collaborated transition from Backbone to Redux and React with new features. The process started by moving away from Grunt to Webpack to deal with packaging the app and rendering HTML templates. That helped build Node.js and Express.js skills.
    • Ported a hotel meta-search site from a proprietary framework to Backbone with responsive design and helped build a proprietary state controller stack to deal with app state and browser history.
    • Supported a Google Chrome price check extension checker, Scout.
    • Assisted unit and integration tests using Mocha and Cypress.
    • Held up a component to trigger pop-unders and tab-switches on partner sites.
    Technologies: CSS3, HTML5, JavaScript, Reagent, MUI (Material UI), ClojureScript, React, Redux, Immutable.js
  • Team Leader, Web Developer

    2012 - 2013
    Walt Disney Parks and Resorts Online
    • Coordinated tasks for a group of five PHP and four QA developers and supported the overall interaction of four engineers with the client.
    • Received client specifications and discussed them with client product owners and business analysts.
    • Worked on app performance using REST request parallelization and resiliency to handle the event of service degradation.
    • Worked on a calendar jQuery plugin.
    • Created other frameworks and libraries, including the Zend Framework 1.x, Guzzle, jQuery, and Mustache.
    Technologies: HTML5, CSS3, JavaScript, PHP
  • Partner Contractor

    2011 - 2011
    Threevoice – FlamingoTV
    • Developed web UI and core components to enable the company to provide prepaid and postpaid VoIP services.
    • Created a client dashboard on top of Zend 1.x and Doctrine2.
    • Managed OpenSips and the Asterisk configuration through Web UI.
    • Built Java handlers implementing a radius dictionary for billing (created by another colleague).
    • Mirrored two stand-alone servers with one acting as master and the other as slave. Implemented them to switch roles in the case of unavailability events.
    Technologies: PGP, Sippy, RADIUS, OpenSIPs, Asterisk, Unix, PHP 5
  • Consultant

    2010 - 2011
    The World Bank
    • Helped to adapt the wage model for the Peruvian government.
    • Helped to adapt the wage model for Antigua and Barbuda's government.
    Technologies: Excel VBA, Microsoft Excel
  • Web Developer

    2010 - 2011
    • Created a web UI to manage email marketing campaigns.
    • Created a "threaded" console daemon using a Unix fork to handle email processing (client use of PHP required).
    Technologies: Unix, PHP 5
  • Web Developer

    2010 - 2011
    • Created an application responsible for mapping real estate attributes from a client app using ZonaProp web services DTD.
    Technologies: PHP 5
  • Web Developer, Technology Integrator, Partner

    2009 - 2010
    • Created a solid state PBX built on top of the NanoBSD OS with MySQL for data and LightTPD as web server.
    • Developed the PHP 5.2 user interface to manage users, groups, IVRs, and terminations.
    • Added a remote deployment of new releases and license management.
    • Created a C++ extension for SEMS to enable prepaid calling cards.
    Technologies: C++, Asterisk, lighttpd, MySQL, PHP 5, NanoBSD (FreeBSD)
  • Contractor, Business Analyst, Developer

    2006 - 2010
    Lockheed Martin Aircraft Argentina SA
    • Resumed efforts pursuing short-term manufacturing plans based on resource availability.
    • Created proofs of concept with ASP.NET and C# to leverage product configuration and midterm planning.
    Technologies: ADABAS, Visual Basic 6 (VB6), C#, ASP.NET
  • Consultant

    2008 - 2008
    The World Bank
    • Helped in the adaptation of the wage model for Paraguay's Government.
    Technologies: Excel VBA, Microsoft Excel
  • Business Analyst

    2005 - 2006
    Vates SA
    • Worked to mock a prospective new product for the company.
    • Prepared proposals for the public sector, including local and nonlocal biddings.
    • Prepared use case analysis for a Transantiago (Chile) project working for Siemens Itron. Helped with Java business rules coding.
    Technologies: CSS, HTML, JavaScript, Java, Use Cases, Rational Unified Process (RUP)
  • Junior Professional Associate

    2002 - 2004
    The World Bank
    • Handled IT support for LCSHD.
    • Collaborated with the “ITC for State Strengthening” terms of reference and project structure.
    • Provided statistical analysis infrastructure through terminal services.
    Technologies: Terminal Servers, Windows Server, Windows
  • Business Analyst, Systems Analyst

    2002 - 2002
    Harriague y Asociados
    • Helped with manufacturing system analysis and design.
    Technologies: Use Cases, UML, Rational Unified Process (RUP)
  • Contractor, PM, Business Analyst, Developer

    2000 - 2002
    Lockheed Martin Argentina SA
    • Prepared and won a bidding offer for a manufacturing system.
    • Negotiated requirements and project boundaries and integration to existing apps with client.
    • Analyzed and developed with a team of two other developers to create a platform to handle product configuration and an MRP level 2.
    Technologies: ADABAS, Visual Basic 6 (VB6)
  • Partner

    1998 - 2002
    • Built several projects related to product configuration and BOM.
    • Created a distance learning platform proof of concept for my university.
    • Developed a site for client invoice orders (Richetta SA - Sonepar Distribution).
    Technologies: IIS, Microsoft SQL Server, IRC, Microsoft Access, Visual Basic 6 (VB6)


  • Roomkey

    Help building a SPA for hotel metasearch. Started as a full in-house dev in ES5 and then evolved to be Backbone based, then React/Redux, to now be in the process of becoming CLJS (Reagent and re-frame) as the BE is CLJ.

    Tech stack: CLJS, Reagent, Reframe, React, Redux, Clojure, Datomic

  • Walt Disney Parks and Resorts Online

    A WDPRO (Disney World and Disneyland) UX site built using PHP, PHPUnit, Zend Framework 1.x, jQuery, HTML5, CSS3, Java (Selenium functional tests), and a RESTFul service layer. I worked as technical leader and web developer. This site handles park schedules, park tickets, resort booking, and personal itinerary and plans.

  • Flamingo VoIP Telephony Platform

    This is a private site for FlamingoTV created using PHP 5.3, Unix, Asterisk, OpenSips, Radius, Sippy, Java, PGP. It features a full VoIP telephony platform integrated with two main custom developments, account management and a dashboard of calls and voicemails handled in a PHP web app, handling for prepaid card batch generation, media service usage, and CDR batch generation. I implemented accounting using a Java Radius client on the B2B (developed by another engineer from the team).

  • Bandin and Alfa Real State Franchise Property Ads

    A private project I created as part of Modelos Digitales online services portfolio. It includes batch process Bandin and Alfa XML assets and pubishes them into the web service API ( The web UI is built to handle all franchise attributes and maps them into ZonaProp valid attributes and values. It also features a nice web UI, single or bulk publishing, and un-publishing as well.

  • Email Marketing Campaigns

    A private application that I created using PHP 5.3, Doctrine 2, Zend Framework 1.x, MySQL DB, and FreeBSD deploy ambient. It includes a batch processing daemon programmed in PHP and implemented using Unix fork. The web UI enabled clients to create their own campaigns. Filters were created based on a command chain using fall-through logic to to avoid saturation of email boxes.

  • Siemens Itron - Transantiago

    I was a business analyst for a transactional switch implementing ISO 8583 protocol to authorize pre-paid cards for metro or bus transportation systems. I also collaborated as a Java developer on business logic implementation.

  • SIP/IPS - Integrated Production System

    A Win32 App built with VB6 and an Adabas D database for persistence. The data was managed with AutoBASE. The platform was refactored and upgraded to support business logic on top of generic configurable forms. I was PM, business analyst, and VB6 developer, and managed product configuration and manufacturing planning from the BOM and based on resource availability. I also managed the inventory with traceability. After a few years, I added extended functionality for short-term production programming as well as a subset of features on ASP.NET with C# for a prospective new intranet app.


  • Languages

    Visual Basic 6 (VB6), SQL, JavaScript, VB.NET, JavaScript 6, JavaScript 5, PHP 5, Visual FoxPro, Visual Basic for Applications (VBA), HTML5, CSS, HTML, PHP, CSS3, Excel VBA, UML, C#, JADE, Java, BASIC, C++, Pascal, Sass
  • Frameworks

    Redux, Zend Framework, Rational Unified Process (RUP), NHibernate, Hibernate, Compass, ClojureScript, Cypress, OpenSIPs, Symfony 2, Bootstrap, Guzzle, CodeIgniter, ASP.NET, Slim, Yii, MUI (Material UI), Re-frame, Next.js
  • Libraries/APIs

    Doctrine 2, React, React Redux, Preact, Backbone.js, Underscore.js, jQuery, Sinon.JS, Chai, REST APIs, RADIUS, Node.js, jQuery UI, SyncJS, Mustache, Immutable.js
  • Tools

    Microsoft Access, Adobe Photoshop, Apache, GitHub Pages, Eclipse IDE, Git, Perforce, MySQL Workbench, Asterisk, Atom, Reagent, JavaScript Debugging, WebdriverIO, Microsoft Excel, GitHub, Adobe Illustrator, Apache Tomcat, Mocha, Mercurial, Apache Ant, CorelDRAW, CVS, IBM Rational Rose, Inkscape, lighttpd, Subversion (SVN), Sublime Text 2, MongoDB Atlas, Create React App, Webpack, Google Kubernetes Engine (GKE), Docker Swarm, Docker Hub, CircleCI
  • Paradigms

    Object-oriented Programming (OOP), RESTful Development, Agile Software Development, Prototype-based OOP, Unit Testing, REST, Procedural Programming, Functional Programming, Continuous Integration (CI), OLAP, Scrum, Behavior-driven Development (BDD), Dependency Injection, Inversion of Control, Microservices, Design Patterns
  • Other

    Web Development, Enterprise Architecture, Integration Testing, Front-end Development, Use Cases, Terminal Servers, Sippy, PGP, NanoBSD (FreeBSD), IRC, IIS, Prototyping, VoIP, Unix Shell Scripting, WebSockets, Business Requirements, Systems Engineering
  • Platforms

    NetBeans, Windows, Unix, Windows Server, MacOS, Visual Studio Code (VS Code), Ubuntu, iOS, FreeBSD, Oracle, Docker, Kubernetes, Amazon Web Services (AWS)
  • Storage

    MySQL, Microsoft SQL Server, ADABAS, SQLite, PostgreSQL, Redis, MongoDB


  • Master's Degree in Supply Chain Management and Technology
    2005 - 2006
    Universitat Ramon Lull - La Salle - Barcelona, Spain
  • Systems Engineer Degree in Systems Engineering
    1994 - 2000
    Instituto Universitario Aeronautico - Cordoba, Argentina
  • Coursework in Electronics Engineering
    1992 - 1993
    Universidad Nacional de Cordoba - Cordoba, Argentina

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