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.