Dennis S.

Senior Full Stack Developer | AI Integration & Backend Systems

I build full stack web applications, AI-powered tools and custom business software. My work connects frontend interfaces with backend services, databases and external APIs, covering both new product development and improvements to existing platforms.

My background in C++, Python and real-time systems brings particular depth to applications that need more than a standard website: live data, complex integrations, automation and dependable backend behavior.

Full Stack Web & SaaS Development

Web applications, SaaS platforms, internal tools and real-time dashboards. React and TypeScript interfaces supported by Python, FastAPI and Node.js services. Development across the application, from frontend functionality and API design to data workflows and system integration.

AI Integration & Business Automation

AI integrations, conversational assistants, voice interfaces and AI-assisted workflows. Connecting AI capabilities to application data, external services and business processes, with validation and error handling around model outputs. Adding AI features to existing products as well as developing dedicated applications.

Backend Engineering & API Integrations

Custom backend services, REST APIs, webhooks and third-party integrations. Real-time communication through WebSockets and WebRTC. Asynchronous processing, data synchronization and recovery logic for applications that depend on multiple connected systems.

Python Automation & Data Workflows

Automation tools for data collection, processing and repetitive business operations. API-driven workflows, backend utilities and rapid prototypes. Python support for AI and machine learning workflows, including experience with PyTorch and TensorFlow.

Software Modernization & Performance

Troubleshooting existing applications, resolving integration issues and improving slow or unreliable software. Refactoring, performance profiling and architectural improvements that make codebases easier to maintain and extend.

Desktop & Systems Engineering

Native Windows applications in C++ and C#, plus high-performance Rust services. Experience with multithreading, event-driven architecture, memory management and low-latency processing.