Karl S.

Top Rated Plus Full Stack Developer | AI Specialist | Top 3% Upwork Talent | Flutter, Kotlin, Swift, React, Node.js, AWS I help startups and businesses build reliable mobile apps, web platforms, scalable backend systems, and practical AI solutions. From developing apps from scratch to integrating AI into existing products, I focus on clean code, thoughtful architecture, and solutions that solve real business problems. **AI Development and Integration** • AI agent development and intelligent workflow automation • LLM integration for AI chatbots, voice assistants, and conversational applications • AI code reviews to identify bugs, improve code quality, and flag potential security issues • AI-powered features using OpenAI and other AI APIs • Integrating AI with existing applications, backend systems, and databases **Mobile and Web Development** • Flutter, Dart, React Native, Kotlin, and Swift • React.js, Next.js, TypeScript, and Node.js • REST APIs, GraphQL, WebSockets, and real-time applications **Backend, Cloud and Integrations** • Firebase, MongoDB, MySQL, and Microsoft SQL Server • AWS, Docker, GitHub Actions, and CI/CD • Stripe, Twilio, OAuth, and third-party API integrations I value clear communication, maintainable code, and delivering work that aligns with your business goals. Whether you need a mobile app, a scalable backend, AI agent development, or AI capabilities added to your existing product, I can help you turn your idea into a working solution. **Let’s discuss your project and build something that delivers real value.**