CHRISTOPHER OH

CONTACT

EMAIL:

adezyw@r.postjobfree.com

PHONE:

980-***-****

EDUCATION

UNIVERSITY OF HAWAII AT MANOA

Honolulu, HI

B.S. Computer Science

ADDITIONAL SKILLS

Swift • JSON Parsing • XCode Git • NSLocalization • Third Party Libraries Unit Testing • Data Persistence • MapKit SQLite • Authentication • CocoaPods XCTest • Key Chain Services • Core Location MVC • Size Classes • Instruments XIB • Alamofire • Notification Center SCRUM • Delegation • Agile Jira • MVVM • Objective-C Slack • Grand Central • UIKit Dispatch Test Driven • Programmatic Views Development • User defaults

SUMMARY

iOS Professional with over 5 years’ experience in native mobile development

Experience with many design patterns including delegation, MVVM, MVC, publisher subscriber, singleton, and more

Experience persisting security sensitive information with Keychain Services

Ability to manage third party libraries through CocoaPods and Carthage

Expert debugger and solver of problems

Skilled implementer of map and location services

Experience working with push notifications as well as local notifications

Experienced practitioner of Agile methodologies, with Scrum being the primary

Code versioning and branching expert with Git

Experience working in Test Driven Development environments

Expert in Swift and Intermediate in Objective-C

Experience consuming RESTful API endpoints and processing the returned data for use in the app

Experience working with major iOS SDK frameworks

Ability to create views using UIStoryboard, XIB, and through implementing views programmatically

Complete Software Development Lifecycle experience, from conception to App Store delivery

Persistence achieved through use of Core Data, plists, UserDefaults, and more

Strong desire to contribute meaningful, useful code

Passionate Lifetime learner

Expert level JSON parsing knowledge

Multithreading experience with GCD and NSOperations

PROFESSIONAL EXPERIENCE

iOS Developer

Ally Financial, Charlotte, NC / Mar 2020 – Present

Ally Mobile https://itunes.apple.com/us/app/ally-mobile/id514374715

Worked for the invest side of the app. Fixed bugs and added many features related to options and equity trading. Created content pages for specific investment related programs offered at Ally. Used Atlasssian tools, specifically Bitbucket, SourceTree, Jira, and Confluence.

Debugged and refactored options and equity trading logic. Cleaned up much of the code by removing hacks and improving readability.

Found backend service issues that was a root cause of many of the bugs present on the mobile app.

Created and improved many elements commonly used throughout the app from Ally’s proprietary library.

Used Core Data to persist data caching favorited or last viewed stock and option quotes, as well as to load static pages that should be available without a network connection.

Attended daily scrum meetings to update team on current work and input on the direction of the team.

Demonstrated new features and progress updates in biweekly product demos to an audience consisting of product owners and department managers.

Refactored older Objective C code to the more current, readable, and maintainable Swift language.

iOS Developer

Family Dollar, Chesapeake, VA / Jun 2018 – February 2020

Family Dollar https://itunes.apple.com/us/app/family-dollar/id1196434600?mt=8

Project to improve the Family Dollar app to improve the user experience. The Family Dollar app provides an easy to use way to shop at Family Dollar stores. Built using Git, Agile, SCRUM, MapKit, Core Data, Carthage, Keychain, and MVVM design pattern.

Implemented dependency injection to solve problem of low testability for network calls

Implemented video service by building new networking calls to RESTful APIs to enable users to watch videos from weekly ads they are interested in

Integrated with RESTful services to enable querying available products for a given store

Utilized Carthage in order to manage third party dependencies to perform required functionality such as the barcode scanner

Persistence achieved through utilization of Core Data to save things such as user’s coupons

MapKit implemented to locate and display nearest stores to the user, including custom placemarks

XCTest used to implement testing of core functionality throughout app· Keychain implementation used to securely store user’s login information

Agile methodologies observed and practiced within a Scrum framework

Advocated for MVVM design pattern to be used throughout the app to aid in testability

iOS Developer

Linksys LLC, Dallas, TX / Aug 2017 – May 2018

Linksys LLC https://itunes.apple.com/us/app/linksys/id533516503

This app is the command center for your Velop system and Linksys Smart Wi-Fi routers. Use the Linksys app anywhere you have an internet connection to check connected devices, set up guest access, or keep your kids off the internet when they should be doing homework. The updated app now covers Velop, whole home mesh Wi-Fi that provides seamless, full-strength Wi-Fi for the whole family.

Guided and mentored Jr. developers through strategies such as code reviews, coaching on best practices, advanced platform topics, etc.

Unit testing designed and implemented unit testing through XCTest for core features and functionality of app

Git utilized for code versioning while observing a modified gitflow branching system with code uploaded to private online repository

Worked on implementing attractive UI as per specs from designer to enable users to see devices on the network, including customization and subclassing of UITableView as well as UITableViewCell

Coded functionality for a custom activity indicator· Majority of development was done under a Test Driven Development approach

Developed account sign in authentication as well as the signup feature flow including networking calls

Utilized Instruments, print statements, LLDB, etc. to trace down and identify memory leaks

Implemented refactorization of development and release candidate code to solve memory leaks

Instruments also utilized to analyze performance issues within application and collaborated with team members to improve affected areas of codebase· Implemented customization of icons, font, colors, etc. in multiple parts of codebase

Networking communication achieved through use of a proprietary library· Team composed of 6 members.

iOS Developer

Mobile Developer, New York, NY / Sep 2016 – Aug 2017

Dow Jones & Company, Inc https://itunes.apple.com/us/app/wall-street-journal-business/id364387007?mt=8

The WSJ app gives you instant access to breaking stories from around the world plus the latest on business and finance, politics and technology, as well as expert commentary and analysis and up-to-the-minute updates on global stock markets and company news.

Grand Central Dispatch used to offload intensive tasks to the global thread

Team composed of 2 designers, 2 testers, and 5 developers

Implemented menu that is accessed by through the use of a swipe gesture recognizer

Subclassed and customized UI elements such as reusable UITableViewCell and UITableView to ensure performance displaying information such as news

Implemented Unit Tests to cover core logic of app· Coded functionality to provide offline experience through saving articles in Core Data

Current use of Autolayout customized to improve UI based on different user device screen size

Distributed team collaborated through utilization of google hangouts with daily stand up meetings being participated in by both remote and local developers

Handled App store submission process through creation of necessary information such as certificates, provisioning profiles, etc.

Retrieved data from API via networking class that implemented URLSession and DataTask objects with parsing handled through JSONSerialization

iOS Developer

Vet2Pet, LLC, Ocean Springs, MS / Aug 2015 – Sep 2016

Vet2Pet, LLC https://itunes.apple.com/us/app/bamc/id981735297?mt=8

This app is designed to provide extended care for the patients and clients of Bienville Animal Medical Center in Ocean Springs, Mississippi.

Implemented functionality for Loyalty Program including the ability to use a custom punch card to increase customer retention for the company’s brand

Git used for code versioning with a gitflow branching model and online code repositories

Remote push notifications implemented to provide applicable updates and news for customers

Worked on functionality of app including the ability to call or email the medical center, as well as presenting a map with locations

Implemented Geofencing and utilized Core Location to deliver proximity alerts when user is close to a medical center

Implemented functionality to keep user up to date with all Bienville Animal Medical Center news through feature that allows access to social media such as Facebook and YouTube

Improved functionality and flow for the functionality where users can add pets directly to the app, including name, nickname, activities, and photos

Ability to request appointments, food, and medication provided in app through API interaction to relay information to server and query available appointment times and other pertinent information

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