Moving on to ascertain my technological proficiency, I must draw your attention to my PHP skills showcase. Conversant with the front-end and back-end innovations of the language, I have undertaken numerous projects, similar to your requirement as it showcases intelligence augmentation. My PHP competence aligns directly with your hunt for a credible developer to enhance an AI Bot.
Besides PHP, I've expertise in iOS development fostering superior cognizance both in front and back-end. Incorporating your desired functionalities like user sign-up, sentiment analysis, and profile updates won't be a herculean task for me. The implementation of cognito authentication will ensure seamless access via the renowned Google and Apple ID interfaces.
Added to my digital expertise, I've demonstrable chatbot experience and knowledge working with Backend API to retrieve case scenarios. Harnessing this knowledge, our application UI can be upgraded with avatars displaying AI's identity participating in the chat challenges while rendering relevant photos.
Wrapping it up, my creative mind coupled with my technical adeptness puts me in prime position to amplify not only your brand presence but also the user experience of your iOS app. My understanding of backend AI functionalities is exactly what you need for this project. Let's leverage technology together and deliver an application that enthralls and delights users at every challenge they undertake!