Zhang Z.

Hi, I'm Zion, a senior mobile and full-stack developer with 10 years of experience building production-ready apps for startups, marketplaces, fintech, e-commerce, and AI-powered products. I specialize in iOS development with Swift, SwiftUI, UIKit, and Xcode, and I can also help clients build the complete product around the mobile app, including backend APIs, admin dashboards, database design, authentication, payments, AI integrations, and deployment. What I can help with: • iOS app development from idea to App Store launch • Flutter cross-platform apps for iOS and Android • AI-powered mobile apps using OpenAI, chatbots, automation, and smart workflows • Backend/API development for mobile apps • App redesign, performance optimization, bug fixing, and feature expansion • Converting web apps into polished iOS and Android apps I focus on clean architecture, smooth UI, reliable performance, and clear communication. Whether you need a new MVP, an upgrade to an existing app, or a full product built end-to-end, I can help you move fast and ship something users enjoy.