John Spalluzzi, Developer in Oakland, CA, United States
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John Spalluzzi

Verified Expert  in Engineering

iOS Developer

Oakland, CA, United States
Toptal Member Since
September 1, 2023

John is a seasoned iOS engineer with over nine years of experience, specializing in media streaming, health, nutrition, and gaming applications. With a track record of managing entire project scopes, his most notable achievements include modernizing user experience for millions at Yummly by Whirlpool, launching a new tvOS app at Tubi that tripled user count and view time, and developing a health app at Twin Health that aids in glucose level management.


Twin Health
Swift 5, Flutter, Xcode, Visual Studio Code (VS Code), iOS SDK
Yummly by Whirlpool
Swift 5, Objective-C, Xcode, iOS SDK
Swift, Objective-C, tvOS, iOS, Xcode, iOS SDK




Preferred Environment

iOS, Swift, Xcode, Objective-C, Git, tvOS, Fastlane, CocoaPods, Carthage

The most amazing...

...projects I've developed are the Tubi video streaming iOS and tvOS apps, often ranked #1 in the free entertainment category.

Work Experience

Senior iOS Engineer

2022 - 2023
Twin Health
  • Developed a health app that helps track and manage glucose levels using Swift 5 and Flutter.
  • Participated in the refactoring of Mixpanel analytics, providing consultation and integration services.
  • Built various fl_chart graphs in Flutter to visualize blood sugar, steps, and weight data.
  • Enhanced user interface features, focusing on meal intervention and meal activity insights.
Technologies: Swift 5, Flutter, Xcode, Visual Studio Code (VS Code), iOS SDK

Senior iOS Engineer

2021 - 2021
Yummly by Whirlpool
  • Modernized existing views using Swift 5 and UIKit, enhancing the user experience for millions.
  • Facilitated user discovery of thousands of recipes by implementing intuitive, step-by-step directions.
  • Worked with REST APIs and JSON serializing and deserializing model objects.
Technologies: Swift 5, Objective-C, Xcode, iOS SDK

Senior iOS Engineer

2017 - 2021
  • Refactored many Objective-C scripts to Swift 5, incorporating contemporary design patterns like dependency injection and MVP.
  • Contributed to significant features, including search, remote config, A/B experiments, and national news.
  • Refactored the entire networking layer, enhancing network efficiency and memory usage.
  • Built and launched a new tvOS app, resulting in a threefold increase in user count and view time.
Technologies: Swift, Objective-C, tvOS, iOS, Xcode, iOS SDK

iOS Engineer

2014 - 2015
Capital Digital Arts
  • Launched two iOS apps during an eight-month tenure at the company.
  • Applied object-oriented design principles and patterns such as Model View Controller, singleton, categories, and delegation in various projects.
  • Worked with frameworks like UIKit, Core Data, Core Animation, Core Location, and UIGestureRecognizer.
Technologies: Swift, Objective-C, Xcode, iOS SDK

iOS Engineer

2014 - 2015
Life Style Design
  • Contributed as an iOS developer to the Fitsom app, ensuring this fitness and nutrition-tracking app's regular updates and maintenance.
  • Worked with various frameworks like Membership Entity, Nutritionix, Reachability, JSON parser, Facebook, Google+, Flickr, Instabug, and Crashlytics.
  • Managed execution times using project management sites and contributed to update planning.
Technologies: Objective-C, Swift, iOS SDK

Lindsey Wildlife Museum | iOS Application

The Lindsey Wildlife Museum project allowed me to apply my technical skills in a real-world context. As a college assignment, I was tasked with developing an iOS application for the museum located in Lafayette, CA.

The project began with a comprehensive consultation with the client to understand their specific needs. This collaborative process allowed me to translate their requirements into a functional and user-friendly iOS application.

The project's technical aspect involved using Python 3 for back-end operations and Objective-C for the iOS-specific components of the application.

One of the key features of the application was a static SQL database. This database was designed to store and manage the museum's extensive data, ensuring efficient information update and retrieval.
2011 - 2014

Bachelor's Degree in Mathematics and Computer Science

Saint Mary's College of California - Moraga, CA


iOS UI Development with Visual Tools



Core Data iOS





Xcode, Git, Fastlane


iOS SDK, Flutter, UIKit, Core Data


iOS, tvOS, Visual Studio Code (VS Code)


Swift, Objective-C, Swift 5, Python 3



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