Senior AI Fullstack (C#, .NET)

We are looking for a Senior AI & Full-Stack Developer (C#, .NET, AI) who is proactive, self-motivated, and comfortable working independently while collaborating with an international team. The role focuses on leading and delivering AI-driven and full-stack solutions, integrating modern AI technologies into business applications.

The ideal candidate is a senior-level developer with strong experience in full-stack software development and AI integration. You will work across software engineering, data processing, automation, API development, and modern AI technologies, taking ownership from concept to implementation.

Technical Requirements

• Strong commercial experience in C# and ASP.NET Web Forms / MVC / .NET Core
• Experience with IIS hosting and management
• Solid HTML, CSS, JavaScript, and modern web development practices
• Strong MS SQL Server and relational database design
• Practical experience integrating Large Language Models (LLMs), including LiteLLM proxy and LLM API integrations
• Experience using OpenAI, Anthropic (or similar)
• Experience building automation workflows and Windows services
• Experience designing and consuming REST APIs
• Strong understanding of data transformation and ETL processes
• Fluency in English

About You

• Senior-level professional able to take ownership of projects from concept to implementation
• Strong analytical, problem-solving, and decision-making skills
• Comfortable managing multiple projects and adapting in a fast-paced environment
• Effective communicator working with technical and non-technical stakeholders

Benefits (B2B cooperation)

• B2B contract with rate: 165–195 PLN/h (depending on experience)
• Co-financed private healthcare
• Budget and support for meet-ups, courses, conferences, and external training
• Access to sports card on partnership terms
• Flexible working hours and remote work setup
• Possibility of corporate hardware and software provision for the contract duration