Christopher Arriola, Android Developer in Berkeley, United States
Christopher Arriola

Android Developer in Berkeley, United States

Member since May 4, 2016
Christopher is a mobile engineer with over seven years of experience creating native Android and iOS applications. He has a strong product sense and an eye for design. His portfolio includes a social network with millions of users, to real-time messaging and more. He also is a strong advocate of RxJava and is currently writing a book called "Reactive Programming on Android with RxJava" (
Christopher is now available for hire




Berkeley, United States



Preferred Environment

Vim Text Editor, Xcode, Android Studio, OS X

The most amazing...

...thing I've built is several Android apps from the ground up.


  • Founder and Developer

    2016 - PRESENT
    Mynah Software LLC
    • Began building the Android app from the ground up for a client.
    • Utilized ReactiveX principles using RxJava.
    • Developed a data layer that abstracts local database read/writes and network operations.
    • Implemented a continuous integration system that runs unit tests after every commit and subsequently distributes a new APK to internal users if all tests pass.
    • Developed a material design compliant application.
    Technologies: Android, Java
  • Mobile Full-stack Engineer

    2015 - 2016
    • Worked as part of a team to launch Operator's first iOS application, which was featured on the front page of the App Store during Black Friday.
    • Built a Python OData implementation.
    • Implemented a throttle mechanism for handling large concurrent requests.
    • Migrated data from an older database to a redesigned/refactored database.
    • Built the first Operator landing page.
    Technologies: iOS, Android, JavaScript, Objective-C, Python, Java
  • Co-founder and Android Developer

    2014 - 2015
    Green Halo Labs
    • Developed the Android app from the ground up for various Silicon Valley startups including Sprig, Fluc, and Sincerely.
    • Open sourced a library on Android for autocompletion of an email address when logging in. The library was featured in an AndroidWeekly newsletter.
    • Blogged and wrote about various Android tips/tricks on the Green Halo Labs blog.
    • Trained junior-level developers from various startups to enable them to be autonomous and take over the codebase.
    • Implemented a reusable module/library that was used by 4 applications for a client.
    Technologies: Java, Android
  • Mobile Engineer

    2012 - 2014
    • Contributed to launch Edmodo's first iPad application. Implemented the authentication flow and various core components on the iPad app.
    • Created the post stream, authentication screen, and various framework components for Edmodo's Android app.
    • Created a tablet optimized Android application.
    • Trained and mentored interns to contribute to features on the iPad application that were eventually shipped to production.
    • Reimplemented the Android application to be a comply to modern design standards.
    Technologies: Objective-C, Java, iOS, Android
  • Software Designer II

    2011 - 2012
    • Built a web server using Jetty.
    • Developed a computer vision application for HP R&D using webOS and OpenCV.
    • Create a hand detection algorithm using a Kinect, IR, and RGC camera using OpenCV.
    • Designed an API in Jetty that allows a client application to interface with the computer vision system.
    • Implemented a 3-camera calibration mechanism using fiducials on a template image.
    Technologies: OpenCV, C++, Java, JavaScript


  • EmailAutoCompleteTextView

    An Android open source library I built for auto-completing email in an EditText view.

  • reMIND

    An Android Wear application that reminds you to be present.

  • TopCropImageView

    A GitHub gist for a custom Android ImageView for a top cropped image.

  • How to Simplify Concurrency with Reactive Modelling on Android (Publication)
    Dealing with concurrency in Android through imperative-style programming can be quite the hassle. RxJava, a library for reactive and functional style programming, allows concurrency constructs to be modeled in a reactive way in Android's non-reactive world. In this article, Toptal Freelance Software Engineer Christopher Arriola shows us how RxJava can be incrementally introduced to existing Android projects and leveraged to simplify concurrency.
  • Meet RxJava: The Missing Reactive Programming Library for Android (Publication)
    Implementing applications that deal with complex concurrent behavior has always been a challenging aspect of programming. Various paradigms exist that promise a solution to this problem in different ways. RxJava is a Java library that enables Functional Reactive Programming in Android development. It raises the level of abstraction around threading in order to simplify the implementation of complex concurrent behavior. In this article, Toptal Freelance Software Engineer Christopher Arriola gives us a detailed walkthrough of RxJava and how it fits into the realm of Android development.


  • Languages

    Java, Swift 2, Python, C++, CSS, HTML, Swift, JavaScript, Objective-C
  • Paradigms

    Unit Testing, Continuous Integration (CI), Functional Programming, Functional Testing
  • Platforms

    Android, iOS, OS X, Heroku
  • Other

    Computer Vision, Software Design
  • Frameworks

  • Libraries/APIs

    RxJava, SQLAlchemy, OpenCV
  • Tools

    GitHub, Git, Android Studio, Vim Text Editor, Xcode
  • Storage

    MySQL, PostgreSQL, Redis, Amazon S3 (AWS S3)


  • Master of Science Degree in Computer Science
    2009 - 2010
    University of Pennsylvania - Philadelphia, Pennsylvania, USA
  • Bachelor of Science Degree in Biomedical Engineering
    2005 - 2009
    Rutgers University - New Brunswick, New Jersey, USA

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