Alexandre is available for hire

Alexandre Mondaini Calvão

Verified Expert in Engineering

Ruby on Rails Developer

Rio de Janeiro - State of Rio de Janeiro, Brazil

Toptal member since October 5, 2012

Expertise

Full-stack Ruby on Rails Agile Development Ruby JSON Apache WebRTC PostgreSQL Ionic SQL AngularJS Java JavaScript Unity Salesforce API PhoneGap

Bio

Alexandre is an expert Ruby on Rails developer who is also experienced with Java and various front-end technologies. In addition, he's worked extensively with WebRTC, building video-based web apps from scratch and many back-end APIs to be consumed by Angular and React.

Portfolio

FCP Euro

Ruby on Rails (RoR), CSS, JavaScript, HTML, RSpec, eCommerce, Solidus, DevOps

Owens Corning

Ruby on Rails (RoR), Ruby, JavaScript, PostgreSQL

Only One, Inc.

Ruby on Rails (RoR), Angular

Experience

Ruby on Rails (RoR) - 15 years
PostgreSQL - 8 years
Ruby - 8 years
JSON - 7 years
Java - 5 years
JavaScript - 4 years
Agile Software Development - 3 years
Python - 1 year

Availability

Part-time

Preferred Environment

Ubuntu, MacOS

The most amazing...

...software I've developed is an isometric map display created with the Kinect.js framework.

Work Experience

Full-stack Developer

2024 - 2024

FCP Euro

Developed an integration with Contentstack to display products dynamically on the main website, enhancing the user experience and improving content management efficiency.
Resolved multiple high-priority bugs in the existing system, reducing site downtime and improving overall system stability and performance.
Collaborated with cross-functional teams to ensure seamless product integration and timely delivery of features, meeting all project deadlines.
Optimized back-end code, reducing page load times, which improved the user experience and SEO performance.

Technologies: Ruby on Rails (RoR), CSS, JavaScript, HTML, RSpec, eCommerce, Solidus, DevOps

Senior Ruby on Rails Developer

2022 - 2024

Owens Corning

Led developing and deploying several React-based web applications, improving user interfaces and enhancing the overall customer experience.
Collaborated with data science teams to integrate AI solutions into core business processes, resulting in improved decision-making and automation.
Developed microservices in Go, optimizing system performance and scalability for large-scale, high-traffic applications.
Worked with cloud-based infrastructure (AWS/GCP) to deploy and manage scalable services, improving system reliability and reducing operational costs.

Technologies: Ruby on Rails (RoR), Ruby, JavaScript, PostgreSQL

Senior Full-stack Developer

2020 - 2021

Only One, Inc.

Built an API from scratch for use with an Angular front end.
Integrated the back end with many technologies like Stripe and Campaign Monitor.
Worked on the Angular front end to fully support the token authentication system.

Technologies: Ruby on Rails (RoR), Angular

Senior Ruby on Rails Developer

2019 - 2019

Canadamark

Developed many functionalities using Rails-related technologies for both back and front-end.
Managed AWS instance servers and created new ones for other environments.
Implemented Capistrano to ease the deployment of the application on many servers.

Technologies: Ruby on Rails (RoR), Unix, Amazon Web Services (AWS)

Cordova Developer

2019 - 2019

Zoomee

Updated the Rideshare app for both Android and iOS.
Updated the Ruby on Rails back end from Rails 3 to 4 and all required gems.
Created new functionalities on the active admin dashboard.

Technologies: Cordova

Senior Full-stack Developer

2019 - 2019

One Love

Created a fully responsive website using Bootstrap.
Managed a DigitalOcean server with Capistrano and related technologies.
Developed back-end features in Ruby-on-Rails using the ActiveAdmin gem.

Technologies: Capistrano, Bootstrap, CoffeeScript, Ruby on Rails (RoR), Ruby

App Developer

2018 - 2018

We Are Alexander

Implemented database storage for long value persistence.
Debugged the Salesforce authentication process.

Technologies: Salesforce, Angular, iOS, TypeScript, Ionic

Full-stack Developer

2018 - 2018

Munchery

Created an API for third-party integration.
Supported the Engine Yard deployment process.
Changed the React front-end based on AB testing results.
Provided TDD development of back-end functionalities.
Generated automated API documentation.

Technologies: Amazon Web Services (AWS), Engine Yard, Docker, MySQL, React, Ruby on Rails (RoR)

Senior Full-stack Developer

2018 - 2018

Ygrene

Constructed a front-end application using Angular 6, Ngrx, and Nx for multiple Angular applications.
Implemented CSS and HTML using the flex-layout system.
Integrated the back-end with many external system APIs.
Constructed a back-end API for the front-end application to access.
Made a Bitbucket Pipeline improvement to run specs on the Rails application.

Technologies: Angular Flex Layout, NgRx, Bitbucket Pipelines, Angular, RSpec, Docker, Ruby on Rails (RoR)

Owner

2016 - 2017

Moca Tecnologia

Created some Unity games as I delved into the world of startup ownership.

Technologies: Unity3D, C#

Senior Ruby on Rails Developer

2014 - 2016

Procore

Integrated a Quickbooks Desktop application with the Procore web app through a web connector that makes SOAP calls to a specified endpoint.

Technologies: JSON, APIs, SOAP, Ruby on Rails (RoR)

Team Leader

2012 - 2014

HelloMd

Created numerous applications using WebRTC technology.
Managed outsourced employees based in Vietnam.
Started a tech company from zero.

Technologies: WebRTC

Developer

2011 - 2012

SESEG

Designed and developed systems for for support of the daily activities of the secretary.
Implemented various functionalities using the test-driven design methodology with RSPEC.

Technologies: Capybara, RSpec, CSS, CoffeeScript, Haml, NGINX, Unicorn, Ubuntu, Git, Ruby on Rails (RoR), Ruby

Developer

2009 - 2011

Ideais

Developed a web service using REST for interfacing a web service with a SOA Web Service.
Developed several REST services that transcribe calls for SOA, allowing access to the CMNET system for hotel booking.
Developed a system for the remittance of scheduled emails and for template registration.
Added user control to a system already in production, along with single sign-on functionality for other systems.

Technologies: Ant Design, Apache Maven, Hibernate, Spring, JavaScript, JSF, Java

Experience

Procore Quickbooks Integration

https://www.procore.com/

I created a Ruby on Rails microservice that would receive a call from the QuickBooks desktop software and send it to the main software. The software was created using the Ruby on Rails and the calls were made using the SOAP protocol. Rspec was used as the test framework.

One Love

Creation of the fully responsive website for the version 2 of the findmymission.com website.

Qbwc_requests

https://github.com/apotema/qbwc_requests

An open-source Ruby gem to create Qbwc requests that makes easy for developers to generate Quickbooks requests. It uses RSPEC as the test framework.

Física Básica (Basic Physics)

A mobile application to teach physics, created using Ionic and Angular. The app has 4 years of development and has been used by more than 200,000 users.

You can also see the iOS version here:
https://itunes.apple.com/us/app/mecanica/id880245410

Marcações (Ionic)

This Ionic app connects to a Ruby on Rails back-end to manage the schedule of appointments of the users.

The app is fully created using the Ionic framework and Angular JS,

Paper Hero

A Unity3D game created by me.

Banco de Talentos

I developed an application for the registration of applicants with interest in lecturing on military policy. Further, I developed a second application for the consultation of the applicant’s information and expertise.

Socitrip

A defunct Ruby on Rails app to manage users' travel recommendations, the app had many functionalities, like Facebook integration.

Gamc

Personal project under active development.

Wikimapa

Wikimapa was an Brazilian startup that was aiming to map slums of Brazil. The web app was made using the Rails framework, with an API to be managed by the mobile app.

MIMO

Mimo was a startup that use to offer photo books that you could create yourself where I created the whole system using Ruby on Rails and many other JS libraries to manage the creation of the photo albums.

Go-Active-Interaction

https://github.com/apotema/go-active_interaction

Go ActiveInteractation is based on active_interaction and aims to bring the power of the Ruby gem to the Go space.
This library shows my passion for contributing to the open-source community and working with the Go language.

Ruby on Rails Development

https://www.owenscorning.com

As a senior Ruby on Rails developer at Owens Corning, I utilized React for front-end development and Ruby on Rails for back-end solutions. Additionally, I implemented AWS Lambda integrations using Go and handled API integrations with various services.

Education

2004 - 2009

Graduate Degree in Computer Science

Universidade Federal Fluminense - Niteroi, Rio de Janeiro, Brazil

Certifications

AUGUST 2009 - PRESENT

SCWCD – Sun Certified Web Component Developer

Sun Microsystems

JANUARY 2009 - PRESENT

SCJP - Sun Certified Java Programmer SE 6

Sun Microsystems

Skills

Libraries/APIs

WebRTC, NgRx, Angular Flex Layout, React, Salesforce API, Facebook API, jQuery

Tools

RSpec, Apache, Git, NGINX, Apache Maven, Capistrano, Microsoft Excel, Adobe Fireworks, FileZilla

Languages

Ruby, C#, SQL, JavaScript, Java, Go, Unicorn, Haml, CSS, TypeScript, Python, CoffeeScript, PHP, HTML

Frameworks

Ruby on Rails (RoR), Ionic 3, Unity3D, Ionic, Capybara, PhoneGap, AngularJS, JSF, Spring, Hibernate, Ant Design, Angular, Bootstrap, JavaServer Faces

Paradigms

Test-driven Development (TDD), Agile Software Development, DevOps

Storage

JSON, PostgreSQL, SQLite, Oracle SQL, MySQL

Platforms

Ubuntu, MacOS, Docker, Engine Yard, iOS, Salesforce, Amazon Web Services (AWS), Unix, Windows, Linux, Solidus

Other

Full-stack Development, Legacy Software, SOAP, APIs, Bitbucket Pipelines, Cordova, Computer Science, eCommerce

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