Mark J.

Senior Mobile App Developer | iOS, Android, React Native

With 25 years in software development and 50+ products delivered, I help startups, growing businesses, and Fortune 500 organizations turn ideas into reliable, production-ready mobile applications. 𝑵𝒐𝒕 𝒔𝒖𝒓𝒆 𝒘𝒉𝒂𝒕 𝒕𝒉𝒆 𝒓𝒊𝒈𝒉𝒕 𝒑𝒂𝒕𝒉 𝒊𝒔 𝒇𝒐𝒓 𝒚𝒐𝒖𝒓 𝒂𝒑𝒑? 𝑶𝒏𝒆 𝒄𝒐𝒏𝒗𝒆𝒓𝒔𝒂𝒕𝒊𝒐𝒏 𝒘𝒊𝒕𝒉 𝒎𝒆 𝒄𝒂𝒏 𝒕𝒖𝒓𝒏 𝒕𝒉𝒆 𝒎𝒐𝒗𝒊𝒏𝒈 𝒑𝒊𝒆𝒄𝒆𝒔 𝒊𝒏𝒕𝒐 𝒂 𝒄𝒍𝒆𝒂𝒓, 𝒑𝒓𝒂𝒄𝒕𝒊𝒄𝒂𝒍 𝒑𝒍𝒂𝒏, 𝒔𝒐 𝒚𝒐𝒖 𝒌𝒏𝒐𝒘 𝒘𝒉𝒂𝒕 𝒏𝒆𝒆𝒅𝒔 𝒕𝒐 𝒃𝒆 𝒃𝒖𝒊𝒍𝒕, 𝒉𝒐𝒘 𝒕𝒐 𝒂𝒑𝒑𝒓𝒐𝒂𝒄𝒉 𝒊𝒕, 𝒂𝒏𝒅 𝒘𝒉𝒂𝒕 𝒕𝒐 𝒅𝒐 𝒏𝒆𝒙𝒕. I build iOS, Android, and React Native applications with a broader view of what it takes to make a product succeed, like connecting the mobile experience with the APIs, backend systems, cloud infrastructure, payments, authentication, and third-party services behind it. This broader engineering perspective helps me identify technical challenges early and deliver mobile products that are reliable today and built to evolve tomorrow. ⭐𝐖𝐡𝐚𝐭 𝐈 𝐒𝐩𝐞𝐜𝐢𝐚𝐥𝐢𝐳𝐞 𝐈𝐧: 𝐢𝐎𝐒 & 𝐀𝐧𝐝𝐫𝐨𝐢𝐝 𝐀𝐩𝐩𝐬 Native mobile applications using Swift, SwiftUI, Kotlin, and Android, as well as cross-platform applications using React Native. 𝐀𝐈-𝐏𝐨𝐰𝐞𝐫𝐞𝐝 𝐌𝐨𝐛𝐢𝐥𝐞 𝐀𝐩𝐩𝐬 AI features and integrations using OpenAI and ChatGPT, including AI assistants, chatbots, agents, recommendations, intelligent workflows, and AI-powered product features. 𝐌𝐕𝐏𝐬 & 𝐍𝐞𝐰 𝐏𝐫𝐨𝐝𝐮𝐜𝐭𝐬 From Figma designs and product requirements to a production-ready application, I can help turn your idea into a focused MVP without unnecessary complexity. 𝐄𝐱𝐢𝐬𝐭𝐢𝐧𝐠 𝐀𝐩𝐩 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 Already have an application or codebase? I can help with new features, bug fixing, performance optimization, refactoring, API integrations, codebase improvements, and ongoing development. 𝐁𝐚𝐜𝐤𝐞𝐧𝐝 & 𝐀𝐏𝐈 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧 I work with the systems your mobile application depends on, including REST APIs, Firebase, Node.js, Python, authentication, payments, subscriptions, databases, maps, geolocation, push notifications, and real-time functionality. 𝐀𝐩𝐩 𝐒𝐭𝐨𝐫𝐞 & 𝐆𝐨𝐨𝐠𝐥𝐞 𝐏𝐥𝐚𝐲 𝐋𝐚𝐮𝐧𝐜𝐡 I can take your application through production builds, testing, deployment, and Apple App Store / Google Play submission. 𝐂𝐨𝐫𝐞 𝐓𝐞𝐜𝐡𝐧𝐨𝐥𝐨𝐠𝐢𝐞𝐬: 𝐌𝐨𝐛𝐢𝐥𝐞: Swift • SwiftUI • Kotlin • Android • React Native 𝐁𝐚𝐜𝐤𝐞𝐧𝐝: Node.js • Python • Firebase • PostgreSQL • MongoDB 𝐂𝐥𝐨𝐮𝐝: AWS • Firebase 𝐀𝐈: OpenAI API • ChatGPT • AI Assistants • AI Agents 𝐀𝐏𝐈𝐬 & 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧𝐬: APIs & Integrations: REST APIs • Payments • Subscriptions 𝐖𝐡𝐚𝐭 𝐘𝐨𝐮 𝐂𝐚𝐧 𝐄𝐱𝐩𝐞𝐜𝐭 ⚡Clear technical planning before development ⚡Clean and maintainable code ⚡Regular working builds and progress updates ⚡Thorough testing & quality assurance. ⚡Reliable API and third-party integrations ⚡Responsive communication ⚡App Store and Google Play deployment ⚡Ongoing maintenance and feature development So, whether you're building a new app, improving an existing product, adding AI, or need help with APIs and integrations, I can help. 𝑺𝒆𝒏𝒅 𝒎𝒆 𝒚𝒐𝒖𝒓 𝒑𝒓𝒐𝒋𝒆𝒄𝒕 𝒃𝒓𝒊𝒆𝒇, 𝑭𝒊𝒈𝒎𝒂 𝒅𝒆𝒔𝒊𝒈𝒏𝒔, 𝒆𝒙𝒊𝒔𝒕𝒊𝒏𝒈 𝒂𝒑𝒑, 𝒄𝒐𝒅𝒆𝒃𝒂𝒔𝒆, 𝒐𝒓 𝒊𝒅𝒆𝒂. 𝑰'𝒍𝒍 𝒓𝒆𝒗𝒊𝒆𝒘 𝒊𝒕 𝒂𝒏𝒅 𝒉𝒆𝒍𝒑 𝒚𝒐𝒖 𝒅𝒆𝒕𝒆𝒓𝒎𝒊𝒏𝒆 𝒕𝒉𝒆 𝒎𝒐𝒔𝒕 𝒑𝒓𝒂𝒄𝒕𝒊𝒄𝒂𝒍 𝒑𝒂𝒕𝒉 𝒇𝒐𝒓𝒘𝒂𝒓𝒅.