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Jonathan Gonzalez — Mobile Development Portfolio
Senior Mobile Engineer specializing in iOS development, with experience building, maintaining, and modernizing production mobile applications across fintech, logistics, enterprise, healthcare, and consumer products.
My work spans native iOS (Swift / Objective-C) and Android (Java) development, with particular experience in legacy modernization, offline functionality, location services, application stability, and production delivery.
TrackIt
IT Team Lead / Mobile Developer
May 2023 – November 2025
Platforms: iOS, Android
Tech: Swift, Objective-C, Java, UIKit, MapKit, Core Location, NFC, BLE, Firebase, REST APIs, Gradle, CocoaPods
TrackIt is a mobile workforce and asset-management platform used to manage jobs, tasks, equipment, field operations, and location tracking.
What I worked on
- Maintained and modernized production iOS and Android applications.
- Improved geolocation, mapping, routing, and tracking functionality.
- Worked with Bluetooth-connected equipment, BLE, NFC, Firebase, and background services.
- Diagnosed and resolved crashes, concurrency problems, and issues within a large legacy codebase.
- Implemented UX improvements and client-requested features.
- Maintained offline functionality and local data handling for field use.
- Managed production releases through the Apple App Store and Google Play Store.
Links:
TrackIt NZ — App Store
TrackIt — Google Play
ING Philippines — Digital Bank
Senior iOS Developer
October 2018 – December 2022
Platform: iOS
Tech: Swift, Objective-C, UIKit, REST APIs, Face ID, XCTest, XCUITest, Azure DevOps, CI/CD
ING Philippines was a mobile-first digital bank providing savings accounts, payments, onboarding, check deposits, transfers, and consumer lending.
What I worked on
- Developed and maintained customer-facing functionality for the production iOS banking application.
- Worked on authentication, security, and Face ID-related functionality.
- Supported a hybrid native/web application architecture.
- Worked on an over-the-air update mechanism that allowed selected web resources to be updated without requiring a complete App Store release.
- Contributed to unit testing, UI testing, production support, and issue resolution.
- Used Azure DevOps for source control, work tracking, build pipelines, and CI/CD.
- Collaborated within a cross-functional Agile engineering team.
Link:
ING Philippines — Video
Titan Access
iOS Developer
July 2016 – September 2017
Platform: iOS
Tech: Objective-C, iOS
Titan Access is a field operations application supporting the lifecycle of construction hoarding projects, including quoting, installation, modifications, removals, health and safety, quality assurance, and engineering compliance.
What I worked on
- Developed and maintained native iOS functionality.
- Supported field-based construction and compliance workflows.
- Worked with application data that needed to remain accessible in field environments.
- Contributed to functionality designed for use where network connectivity could be unreliable.
Link:
Titan Hoarding Systems — Google Play
AroundAbout Live
iOS Developer
October 2015 – November 2015
Platform: iOS
Tech: Objective-C, Location Services, Mapping
AroundAbout Live was a location-based discovery application for finding nearby restaurants, bars, clubs, activities, and venues.
What I worked on
- Developed native iOS functionality.
- Worked with location and mapping services.
- Contributed to the application’s gesture-driven, card-based discovery interface.
- Implemented functionality around venue discovery, ratings, and favorites.
Link:
AroundAbout Live — Archived Listing
PeriCoach
iOS Developer
January 2015 – March 2015
Platform: iOS
Tech: Objective-C, Device Integration
PeriCoach was a companion application for a physical sensor device used for pelvic-floor training and formed part of a Class I medical-device system.
What I worked on
- Worked on communication and interaction with a connected physical sensor.
- Improved exercise visualization and usability.
- Improved application reliability around device-driven functionality.
- Developed within the requirements of a medical-device ecosystem.
Link:
PeriCoach — App Store
Chuzi Mix
iOS Developer
September 2014 – October 2014
Platform: iOS
Tech: Objective-C
Chuzi was a matchmaking application built around a “Spin and Admire” interaction model rather than a conventional swipe interface.
What I worked on
- Developed and maintained native iOS functionality.
- Implemented interactive matchmaking features.
- Worked on custom user-interface interactions and application behavior.
Link:
Chuzi — Archived App Listing
DiscoverForever
iOS Developer
March 2014 – April 2014
Platform: iOS
Tech: Objective-C, Salesforce, Offline Data
DiscoverForever provided Forever Business Owners with mobile access to training resources, product information, and business-development materials.
What I worked on
- Joined as one of the initial iOS developers.
- Implemented offline media browsing and caching.
- Integrated mobile functionality with Salesforce-backed services.
- Improved usability when operating with limited or unavailable connectivity.
Link:
DiscoverForever — App Store
RateMySuper
iOS Developer
June 2013 – August 2013
Platform: iOS
Tech: Objective-C, Salesforce, PDF Generation, Charts
RateMySuper was an Australian financial-product comparison application that allowed users to compare products through side-by-side views, charts, graphs, and generated reports.
What I worked on
- Contributed from initial design through production deployment.
- Developed side-by-side financial product comparison interfaces.
- Implemented charts and data visualization.
- Implemented dynamic PDF report generation.
- Integrated application functionality with Salesforce services.
Link:
RateMySuper — Demo Video
Cricket Live Australia
iOS Developer
October 2012 – January 2013
Platform: iOS
Cricket Live Australia provided live cricket coverage including video streaming, highlights, scores, ball-by-ball commentary, news, and player information.
During the 2012–2013 cricket season, the application exceeded one million downloads.
What I worked on
- Contributed to development of the production iOS application.
- Worked within a high-traffic consumer mobile product.
- Contributed to an application delivering real-time sports content during the Australian cricket season.
Link:
Cricket Live Australia — Project Archive
DocBox
iOS Developer
May 2012 – July 2012
Platform: iPad / iOS
Tech: Objective-C, Salesforce, Offline Caching, PDF
DocBox was an enterprise iPad application providing mobile access to documents and sales collateral stored through Salesforce.
It allowed field sales teams to access, present, annotate, organize, and share documents while retaining access to important content when connectivity was limited.
What I worked on
- Developed native iPad functionality.
- Integrated application functionality with Salesforce.
- Worked on offline document caching and management.
- Supported PDF presentation and viewing.
- Implemented document sorting, filtering, notes, and sharing functionality.
Link:
DocBox — Project Archive
DME
Mobile Developer — Symbian / iOS
April 2011 – December 2011
Platforms: Symbian, iOS
Tech: Symbian C++, Objective-C, iOS, Mobile Security
DME was an enterprise mobility platform providing secure access to corporate data and services across multiple mobile platforms.
I initially worked on the Symbian client before transitioning to the iOS development team.
What I worked on
- Maintained and enhanced an established enterprise mobile security application.
- Implemented bug fixes, enhancements, and UI functionality for the Symbian client.
- Developed location-related functionality for iOS.
- Implemented file association functionality on iOS.
- Transitioned professionally from Symbian C++ development into Objective-C/iOS development.
- Received technical training in Denmark covering iOS development and the DME iOS client.
Link:
DME 4 — App Store
Core Technologies
iOS: Swift, Objective-C, UIKit, SwiftUI, Core Data, MapKit, Core Location, CoreBluetooth, NFC
Android: Java, Android SDK, Gradle
Architecture: MVVM, MVC, Clean Architecture, Offline-First Architecture
Backend & Services: REST APIs, Firebase, Salesforce
Testing: XCTest, XCUITest, Unit Testing, UI Testing
DevOps & Tools: Git, Azure DevOps, CI/CD, CocoaPods
Specialized Experience: Offline data, location tracking, mapping, BLE, NFC, mobile security, legacy modernization, production troubleshooting
About Me
I’ve been developing software professionally since 2004 and working with iOS since 2011.
Much of my career has involved stepping into existing applications, understanding complex or legacy codebases, diagnosing problems, and making them more reliable and maintainable.
I particularly enjoy solving difficult production problems, improving application architecture and stability, and working with product teams and stakeholders to turn real-world requirements into practical technical solutions.