Senior Mobile App Developer + AI Engineer (Flutter, React Native, Native iOS & Android)

We are looking for a highly experienced Mobile App Developer and AI Engineer for a part-time, ongoing engagement to work on complex applications across multiple industries, including SaaS, fintech, healthcare, fitness, e-commerce, marketplaces, social networking, IoT, and AI-powered products. This role requires strong technical expertise, problem-solving skills, excellent communication, and the ability to take ownership of complex projects from planning to production. Required Skills Cross-platform: Flutter, Dart, React Native, TypeScript Native Android: Kotlin, Android SDK Native iOS: Swift, SwiftUI, UIKit AI Development: OpenAI APIs, LLMs, AI agents, chatbots, AI integrations Backend & Integrations: REST APIs, Firebase, Supabase, databases, WebSockets Engineering: GitHub, testing, debugging, CI/CD, App Store and Play Store deployment Requirements 5+ years of professional mobile development experience. Proven experience building and launching complex mobile applications. Strong understanding of mobile architecture, performance, security, and API integrations. Practical experience integrating AI features into real-world applications. Excellent communication, independent problem-solving, and project ownership. Ability to adapt to different industries, technologies, and project requirements. Work Arrangement & Budget This is a part-time, long-term engagement on a fixed weekly retainer basis, with ongoing opportunities to contribute to projects across multiple industries. The budget displayed on this job post is for demonstration purposes only and is not the actual budget. Please propose your own realistic fixed weekly retainer based on your expertise and availability. Clearly mention your proposed weekly budget, the number of hours you can commit per week, and your availability. How to Apply Generic AI-generated or copy-paste proposals will be ignored directly. We are looking for genuine professionals who can demonstrate their experience, technical depth, and problem-solving approach. Please include the following in your proposal: Your updated CV or resume. Portfolio and links to mobile applications you have developed. GitHub profile or relevant code samples. Your experience with the technologies listed above, including your proficiency in each. Two complex projects you have worked on, explaining your role, challenges, and solutions. Your technical approach to handling complex mobile and AI development projects. Your proposed fixed weekly retainer, weekly hours, and availability. We are looking for a reliable, experienced professional for a long-term collaboration. If you have the technical expertise, communication skills, and ownership mindset to deliver high-quality applications, we would like to hear from you.