As an experienced and highly skilled mobile app developer, I am confident that I possess the required skill set you are looking for in your event booking app project. My decade-long expertise in both Android and iOS development has equipped me with a solid understanding of designing and building apps from scratch all the way to final deployment. This includes e-commerce functionalities, user authentication features, and more - key requirements you've outlined for your app.
Additionally, my proficiency in Swift, Java, Dart, Objective C, C#, HTML, and PHP - paired with my deep knowledge of IDEs like Xcode, Android Studio, and Eclipse - makes me a versatile developer capable of catering to varied platforms and technologies. Notably, I am adept at Flutter mobile app development which positions me perfectly with respect to your plan for iOS expansion.
I believe what truly sets me apart is my commitment to writing clean code that's both efficient and maintainable well beyond project completion. As testament to this claim, I would be delighted to share examples of my previous work that demonstrate the quality of my code as well as my ability to create apps that provide great user experiences and flexible interfaces. So let's collaborate and bring your event booking app design concepts into reality!