Christopher Arriola, Developer in Berkeley, United States

Christopher Arriola

Android Developer

Berkeley, United States
Toptal 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" (

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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.

Work Experience

2016 - PRESENT

Founder and Developer

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
2015 - 2016

Mobile Full-stack Engineer

  • 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
2014 - 2015

Co-founder and Android Developer

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
2012 - 2014

Mobile Engineer

  • 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
2011 - 2012

Software Designer II

  • 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



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


An Android Wear application that reminds you to be present.

A GitHub gist for a custom Android ImageView for a top cropped image.
Image of Meet RxJava: The Missing Reactive Programming Library for Android publication

Meet RxJava: The Missing Reactive Programming Library for Android
Image of How to Simplify Concurrency with Reactive Modelling on Android publication

How to Simplify Concurrency with Reactive Modelling on Android



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


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


Android, iOS, OS X, Heroku


Computer Vision, Software Design




RxJava, SQLAlchemy, OpenCV


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


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


2009 - 2010

Master of Science Degree in Computer Science

University of Pennsylvania - Philadelphia, Pennsylvania, USA

2005 - 2009

Bachelor of Science Degree in Biomedical Engineering

Rutgers University - New Brunswick, New Jersey, USA