John Coates, Developer in Austin, TX, United States
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John Coates

Verified Expert  in Engineering

Reverse Engineering Developer

Austin, TX, United States
Toptal Member Since
January 11, 2018

John has over ten years of experience developing for Apple platforms. He strives to communicate well and effectively, has worked in teams of varying sizes from large-scale one-person projects to projects with up to a dozen developers. John has many open source contributions, including creating one of the most popular Swift projects on GitHub.


ARM Assembler, Objective-C, Swift, Interactive Disassembler (IDA) Pro...
Interactive Disassembler (IDA), Objective-C
TypeScript, Vapor, Objective-C, Swift




Preferred Environment

Sketch, Git, Xcode, MacOS

The most amazing... I've made is one that brought reverse engineering to the masses, and let people create and share projects with no coding experience, all through a UI.

Work Experience


2013 - PRESENT
  • Created a dynamic Objective-C hooking platform. Using three distinct assembly architectures, ARM, ARM64, and x86-64.
  • Constructed an intuitive way for users to create iOS tweaks with no programming experience, completely in the UI.
Technologies: ARM Assembler, Objective-C, Swift, Interactive Disassembler (IDA) Pro, Reverse Engineering

iOS Engineer

2017 - 2019
  • Created an Objective-C-based CLI tool integrated with iOS's internals for high iteration automation of complex tasks.
  • Contributed to the open-source reverse engineering engine, Frida.
  • Reverse-engineered the iOS App Store to monitor network requests and ingest data.
Technologies: Interactive Disassembler (IDA), Objective-C

iOS Developer

2017 - 2018
  • Created a solution for playing inline video on iOS 9+ that works within WebViews that have this feature explicitly disabled.
  • Led the development of an SDK framework that was implemented in various popular applications such as T-Mobile's iOS app.
  • Created a Facebook Messenger bot to showcase integrations with service.
  • Provided guidance into implementing automated enforcement of code style guidelines.
Technologies: TypeScript, Vapor, Objective-C, Swift

iOS Developer

2017 - 2017
Well Done
  • Wrote a Firebase abstraction for strict typing and increased intuitiveness of controllers.
  • Implemented initial designs of application, including realtime chat and notifications.
Technologies: Firebase, Swift

iOS Developer

2017 - 2017
Rapid Healthcare
  • Built out extendable Vapor backend for integrating with Amazon Alexa commands.
  • Wrote Swift iOS framework that allows for pairing of an Amazon Echo to a phone for issuing commands that are reflected in an iOS app.
Technologies: Vapor, Swift

Slate - iOS Camera
Fully configurable iOS camera


Xcode, PaintCode, Sketch, Git, Interactive Disassembler (IDA) Pro, Interactive Disassembler (IDA)


Objective-C, Swift, TypeScript, ARM Assembler


iOS, Firebase, MacOS


Core Data, Vapor, Metal






Software Development, Reverse Engineering

Collaboration That Works

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