My expertise in test-driven development and other leading technical practices for iOS can bring impacting change to your organization.Having over 20 years of work experience in the Apple ecosystem, I have developed strong proficiency in unit testing, test-driven development, and refactoring — all in service to shipping quality features while keeping the cost of change low. While working on the Garage feature for eBay Motors, the team lead wrote: “I’ve never seen anyone refactor the large codebase that we had and contribute to new features at the same time.” I have since gone on to write the book iOS Unit Testing by Example: XCTest Tips and Techniques Using Swift.My iOS app experience includes eBay Motors, eBay Fashion, eBay Instant Sale, Amex, Skype, Skype Qik, and Industrial Logic Games.In my previous role at American Express, I not only shipped features on their flagship app — but I also advanced testing practices across the 30-person iOS team while doing so. I coached iOS engineers in refactoring for testability, and personally eliminated several thousand lines of dead code. And I delivered presentations to the iOS team, the mobile team, and the entire CTO organization to promote technical agile practices such as story slicing. I can see myself doing these same things at eBay.In my current role at Industrial Logic, I have increased collaboration in cross-functional teams, increased flow, reduced waste, led retrospectives, and leveled up the technical skills of the developers at companies such as Ford, Starbucks, and Royal Bank of Canada. A workshop I developed for Ford led their UK iOS team through a series of hands-on exercises, culminating in refactoring UIKit code to SwiftUI protected by a safety net of cheap, fast-running unit tests on the view code itself. (Most developers, including those at Apple, are not aware of this ability and choose to use expensive, slow-running UI tests.)I am passionate about two things: reducing the cost of change, and increasing developer joy.“I've never seen anyone refactor the large code-base that we had and contribute to new features at the same time.” — eBay“Jon teaches a very practical, hands-on approach on how to implement TDD and write quality testable code. He fills a huge void in the iOS community when it comes to unit-testing and quality.” — Alaska Airlines“Jon helped us with our actual codebase, impressing me with his skill of making impacting code changes on a large codebase he had just seen.” — ABN AMRO Bank(Head shot by Rob Sirota Photography, https://robsirotaphotography.com)