Experience in iOS app development encompasses a large variety of elements; indeed, it is not merely about the number of years a company has been operating in the space. A well-rounded IOS app developer should have a robust portfolio that showcases a wide range of applications they've created; this is an essential indicator of their ability to handle diverse projects and client needs. It's also crucial to consider their proficiency in languages such as Swift and Objective-C, which are integral to IOS app development. Additionally, one should look into their understanding of the IOS Human Interface Guidelines, as this is vital for creating intuitive and user-friendly apps. Furthermore, their experience working with IOS frameworks such as UIKit, Core Data, and Core Animation, among others, could greatly impact the functionality and performance of the developed apps. A truly experienced IOS app developer should also be familiar with Apple's App Store guidelines and possess the skills to navigate the app submission process. Therefore, when assessing the experience of IOS app developers, one must not solely focus on the duration of their existence in the industry; rather, it is far more beneficial to delve into the aforementioned facets of their experience and expertise.

Absolutely, the familiarity with the latest technologies and development tools is a critical factor when evaluating iOS app developers; it can significantly influence the quality, efficiency, and innovation of the apps they produce. The iOS app development space is dynamic and rapidly evolving; hence, developers who keep abreast of the latest advancements tend to have a competitive edge. They should be well-versed with programming languages like Swift and Objective-C, and also have a deep understanding of the iOS SDK (Software Development Kit) and Xcode, Apple's integrated development environment. Furthermore, they should be proficient in utilizing contemporary tools and frameworks, such as SwiftUI for building user interfaces, Combine for handling asynchronous events, and ARKit for augmented reality app development. Additionally, knowledge of cloud integration, artificial intelligence, machine learning, and familiarity with Apple's Human Interface Guidelines are also vital for creating apps that are not only functional but also seamless and user-friendly. So, when comparing iOS app developers, consider their proficiency and adaptability with the latest technologies and tools, as it could be a reliable indicator of their capability to deliver high-quality, future-ready apps. However, technical expertise is just one aspect; other factors like their understanding of your project requirements, their communication and collaboration skills, their development methodology, and their track record should also be considered for a holistic evaluation. By doing so, you are more likely to find an iOS app developer that not only meets your technical specifications but also aligns with your vision, objectives, and project needs.

Yes, a successful iOS app developer should indeed have a robust portfolio of projects that showcase their skills, expertise, and efficacy; this serves as a testament to their proficiency in the field. This portfolio should ideally exhibit a diverse range of applications, demonstrating their versatility and adaptability to different project requirements; thus, showing their capacity to handle varied IOS development tasks. When viewing such a portfolio, it's important to consider not just the quantity, but the quality of the apps developed; their functionality, user interface, and user experience are all crucial aspects to assess. Furthermore, one should also look into the success of these applications in the real world; for instance, their ratings and reviews on the App Store, number of downloads, and user feedback can all provide valuable insights into the developer's competency. Finally, it's also beneficial to understand the involvement of the developer in the project; whether they were responsible for the app from conception to deployment, or whether they only played a minor part in the development process. This will provide a more comprehensive understanding of the developer's abilities and experience in the IOS app development space.