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Mateus Gondim Romão Batista, Java Developer in Recife - State of Pernambuco, Brazil
Mateus Gondim Romão Batista

Java Developer in Recife - State of Pernambuco, Brazil

Member since November 27, 2014
Mateus is an experienced Java developer who has been focusing on Android since 2014. He has also developed web projects using Python, Django, and JavaScript. Mateus is a thoughtful, calm person who doesn't rush with solutions but takes the time to think the problem through in order to solve it properly. He communicates extremely well and can clearly explain his ideas and code.
Mateus is now available for hire

Portfolio

Experience

  • Java, 9 years
  • Android, 5 years
  • Git, 5 years
  • SQL, 5 years
  • Python, 2 years
  • JavaScript, 2 years
  • Firebase, 1 year
  • Kotlin, 1 year
Recife - State of Pernambuco, Brazil

Availability

Part-time

Preferred Environment

Ubuntu, Android Studio, Git

The most amazing...

...project I've worked on was a social messaging app where users could apply effects to their faces.

Employment

  • Senior Android Developer

    2017 - 2019
    TravelBank (via Toptal)
    • Converted code to MVP(Model-View-Presenter) architecture.
    • Added unit tests to existing and new features.
    • Created a screen to display hotels pinned in a map with detail cards at the bottom, similar to Google Maps.
    • Integrated custom animations using Lottie.
    • Applied Material Design principles throughout the app.
    Technologies: Android, Java, RxJava, Dagger, Mockito, Mapbox
  • Android Developer

    2017 - 2017
    Infuse (via Toptal)
    • Created an app from scratch that updates inventory and orders from the Clover Platform using the Clover-Android SDK.
    • Developed an app that manages authorizations and payments using the Clover REST API.
    • Implemented an intense code refactoring of a poorly designed and written codebase—improving code readability and maintainability.
    • Applied a TDD approach—writing unit tests for each component before coding.
    Technologies: Android, Java, Clover, Git, Android Studio
  • Android Developer

    2016 - 2016
    Moede (via Toptal)
    • Developed an app from scratch that plays tracks according to a user's location.
    • Integrated Google Maps and Geofencing APIs.
    • Developed a module that captures audio from a microphone and plays it in real-time.
    • Developed a module that plays multiple tracks in sync, each with its own volume.
    • Developed a module that syncs data with a Firebase Database and downloads files from Firebase Storage.
    Technologies: Android, Java, Firebase, Google Maps API, Geofencing API
  • Android Developer

    2015 - 2016
    Mesa
    • Developed a social app with video calls using XMPP and integrated it with a native C++ library.
    • Developed an app based on maps and location with a login via Facebook.
    • Learned advanced Git commands.
    • Extracted images from Photoshop wireframes and adjusted them to be used in apps.
    • Maintained daily contact with a remote development team via Slack.
    Technologies: Android, Java, Git, Android Studio, XMPP, Realm, Google Maps API
  • Software Developer Intern

    2011 - 2013
    Itautec
    • Developed web services using SOAP.
    • Developed a web solution using JavaScript, JSF 2, HTML, and CSS.
    • Integrated a SQL Server database to a Microsoft Business Intelligence Solution.
    • Learned structural and performance differences between Oracle and SQL Server databases.
    Technologies: JavaScript, SQL Server, Oracle Database, JavaServer Faces (JSF) 2
  • Software Developer Intern

    2011 - 2011
    Suati
    • Fixed bugs and implemented new features in a large-scale system written in C#.
    • Supported adjustments to an Oracle database.
    Technologies: C#, Oracle Database

Experience

  • Lychee (Development)

    A photo sharing app integrated with the Google App Engine. From the Android side, the development involved a Facebook login, in-app purchases, a custom camera, image uploading, parallel processing and other features. The server was based on the Google App Engine, using a non-relational database.

  • Guess The Note (Development)

    A game app to guess musical notes. Integrated it to Google Plus, Google Analytics, and Google Play Games Services (social leaderboards and more).

  • Sportifile (Development)

    An app to schedule and manage football games. Some of the technical highlights were: login via Facebook, push notifications via Google Cloud Messaging, and maps based on user location.

  • 99Gás (Development)

    An app that enables users to order gas from their mobile devices. Integrated with push notifications through Google Cloud Messaging.

  • DLNA Videos (Development)
    https://youtu.be/9T6GGBuOEQo

    An app that streams videos stored in a DLNA Server. It also generates previews of those videos using FFmpeg and displays them in a list.

  • Realm Is the Best Android Database Solution (Publication)
    Since the inception of the platform, Android developers have had pretty much only one option for a database: SQLite. Although feature-rich and powerful, it wasn’t quite what Android app developers needed. Realm, a modern, efficient database solution for mobile platforms, turned out to be an amazing replacement for SQLite on Android. In this article, Toptal Software Engineer Mateus Gondim Romão Batista explains why you should use Realm for your next Android application.

Skills

  • Languages

    Java, SQL, Python, JavaScript, Kotlin
  • Tools

    Android Studio, Slack, Git, Google Cloud Messaging
  • Platforms

    Android, Firebase, Oracle Database
  • Frameworks

    Mockito, Django, Dagger 2
  • Libraries/APIs

    RxJava 2, Google Analytics API, Google+ API, Facebook API
  • Storage

    Realm, Microsoft SQL Server, NoSQL
  • Other

    Mapbox SDK

Education

  • Certificates in Programming Mobile Applications for Android Handheld Systems: Part 1, Part 2, & Concurrency
    2014 - 2015
    University of Maryland, College Park via Coursera - Online
  • Bachelor's degree in Computer Science
    2009 - 2015
    Universidade Federal de Pernambuco - Recife, Brazil
  • Studied in an Exchange Program in Computer Science
    2013 - 2014
    Queen Mary University of London - London, England
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