Juan O. - Senior Software Engineer

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Lisboa, Portugal

Experience

Oct 2023 - Jun 2024

9 months

Lisbon, Portugal

Senior Software Engineer

Randstad Digital Portugal

Working at Thales Group (later Hitachi) on the Alvea messaging system for public transportation for clients in Europe and Arab countries
Responsible for discovery, checking conflicts between requirements and existing components, proposing alternatives and developing final solutions
Proposed a standard architecture for the front end and service consumption using RESTful and WebSockets
Implemented a library to mock responses to accelerate development
Defined unit testing for service consumption and developed libraries for common team usage

Mar 2022 - Jul 2023

1 year 5 months

Lisbon, Portugal

Freelance Senior Software Engineer

Erste Digital

Developed an internal web application for the bank to help compliance officers manage projects and deals, check transactions and trigger alerts and notifications
Defined requirements, proposed UI/UX solutions, defined architecture, estimated and developed the solution with unit tests and created all possible scenarios
Technologies: Meteor with TypeScript, ReactJS, MaterialUI, NodeJS microservices, cron jobs, MongoDB, GraphQL, typeorm, OracleDB
Implemented performance solutions for back-end job creation and triggering, database view creation and change history display

Mar 2021 - Dec 2021

10 months

Portugal

Freelance Software Engineer

A1 Telekom Austria

Created a cart platform consuming SOAP services for A1 Austria through IBM
Developed a NodeJS service to simplify SOAP consumption, handle caching and expose to ReactJS following Figma designs
Technologies: ReactJS (Redux + Hooks), NodeJS, ExpressJS, TypeScript, Storybooks, RxJS, MongoDB
Deployed via Jenkins CI/CD, configured environment variables in Kubernetes
Used Redis to create a local mock service simulating SOAP responses

Mar 2020 - Feb 2021

1 year

Belgium

Senior Software Engineer

agap2 Belgium

Worked for two clients in Brussels
Qover: implemented a new loan insurance product using ReactJS, Hooks, Storybooks and styled-components; proposed new architecture to simplify product inclusion and REST service mocking
Toyota Europe: maintained legacy code with jQuery plugins, server-side rendering using Nunjucks and SCSS; delivered quality code without complicating existing large codebase

May 2019 - Dec 2019

8 months

Portugal

Senior Software Engineer

Penguin Formula

Gaia (Point of Sales for pharmacies): built with Angular v7, Flexbox Grid and Electron
Template Generator: created PDF and DOC files based on a template editor and data source using SlateJS and React libraries
Sent merged inputs to a NodeJS service running Puppeteer to generate PDF files

Jun 2014 - Mar 2019

4 years 10 months

Argentina

Contractor Sr. Developer

iSeatz

Developed for US-based startup with American Express as main client using React Redux, CSS Foundation, jQuery plugins and Vagrant on Linux
Fulfilled requirements described by QA team acceptance criteria to reduce issue statistics
Improved professional skills and travelled learning German and Russian

Jul 2013 - Dec 2013

6 months

Córdoba, Argentina

Technical Lead

Harriague + Asociados

Led a team for Intel to migrate yourid.intel.com to NodeJS technologies
Enabled host sites to render common parts using native JavaScript and added OAuth security
Retrieved data from Intel API, implemented unit tests and rendered site with AngularJS supporting internationalization
Technologies: JavaScript, NodeJS, ExpressJS, AngularJS, MongoDB, Mongoose, RequireJS, unit testing, HTML5, CSS3

Mar 2013 - Jun 2013

4 months

Córdoba, Argentina

Developer Ssr

Motorola (Arris)

Worked on an Agile Scrum project using a PrototypeJS-based MVC framework
Improved team velocity by creating a Ruby script to run required tests before committing changes
Technologies: native JavaScript, Ruby, HTML5, CSS3

Jan 2012 - Feb 2013

1 year 2 months

PHP Developer Ssr

Globant

Improved Disney site to communicate with Java-based RESTful services returning JSON to a Zend Framework PHP site
Developed features with PHPUnit unit tests, JBehave integration tests and code reviews
Implemented jQuery plugins with QUnit tests and applied HTML5 and CSS3 standards
Created a batch script to package Perforce changelists into zip and unpack them to avoid CI issues
Technologies: PHP5, Zend Framework, PHPUnit, jQuery, QUnit, JBehave, HTML5, CSS3

Jul 2009 - Jan 2011

1 year 7 months

Sevierville, United States

Information Analyst

S.D. Professionals, LLC

Created a bridge between tickets.com and clients implementing a RESTful-like service and Google Analytics tracking
Flexible affiliate coverage selection displayed via Google Maps API, handling over one million postal codes with performance-optimized SQL
Developed an intermediate database updated daily via PHRETS library and batch scripts to overcome query limits
Focused on OOP, design patterns and proof of concepts for reusable libraries
Improved English, client handling and developed proposals for new products and software architecture methodologies

Jun 2008 - Jul 2009

1 year 2 months

Information Programmer

EDS, an HP Company

Supported and maintained GMAC main system developed in COBOL on OS/2 mainframe with IMS database
Applied SCL3 quality process, wrote JCL programs, executed SQL queries and generated datasets reports
Gained skills in CMMI3 quality process and cross-cultural English communication
Technologies: COBOL, Pacbase, JCL; Tools: IMS, DB2, AS400

Mar 2008 - Apr 2008

2 months

Córdoba, Argentina

Developer

Judiciary of the Province of Córdoba

Developed software in Visual Basic 6.0 with MS Access managing legal authorization processes with statuses, categories and signer workflows
Generated .eml files for emailing via Outlook and provided basic statistics charts

Jan 2007 - Sep 2007

9 months

Research and Development

Latinexperts S.A

Built an SMTP server in C++ to intercept emails, embed tracking images and resend, enabling open tracking with location and time data
Technologies: C++, MySQL++, MIME and SMTP standards, sockets, Linux threading, DNS resolution, GCC
Developed various PHP+MySQL projects: Google search statistics script, internationalizable sites and maintenance tasks

Jan 2006 - Jul 2006

7 months

Córdoba, Argentina

PHP Developer

Flexxus

Provided web requirements for an enterprise Delphi-based solution using PHP and MySQL

Jan 2005 - Jan 2006

1 year 1 month

Web Developer

Freelance

antiguoscolegiales.com.ar: ASP site with MS Access database for alumni networking, including ephemeris display with poems and tags
pachamamerica.com.ar: PHP/MySQL site with Flash intro and interactive map for sponsored motorcycle travel, with stories and forum

Jul 2004 - Nov 2004

5 months

Córdoba, Argentina

Computers Laboratory Manager

Instituto Academia Argüello school

Managed computer lab scheduling, technical maintenance of computers and printers, and email distribution to departments

Summary

I am a +20 years experienced fullstack software developer working mainly with javascript related technologies. My recent experience includes ReactJS (Redux, Flux, Sagas and Hook stacks), NodeJS, AngularJS and JQuery. Database engines like MySQL, Oracle, DB2 and MongoDB. Libraries like typeorm and graphQL.

On the frontend, I have extensive large experience with HTML5, CSS/CSS3 and worked with frameworks like Foundation and FlexGrid, styled-components and storybooks.

I have deployed my work with Docker to AWS clouds and to Google Cloud through Kubernetes. Also have worked with CI environments such as Jenkins.

My first steps in programming were working with C++ on Linux, later on COBOL and mainframe-related tools or also technologies like VisualBasic, ASP and ActionScript.

I am currently interested in learning new technologies related to blockchain like Solidity, also React Native and React xState.

I consider myself a responsible and honest person, very structured and expedite. I like challenges and usually propose new things to solve problems, such as automating scripts, tools for daily work or implementing tips to facilitate the way of working, well-defined and clear concepts and good direction of work.

On a personal note, I have been traveling the world for the past two years on a part-time basis and have used that time to learn a bit of German, Russian and kite surfing as well.