Senior .NET Developer

Permanent employee, Full-time · Burgas

Main responsibilities
  • Design, develop, and maintain high-performance .NET applications (C#, .NET Core / .NET 6+)
  • Architect and implement AI-enhanced features, including automation, recommendations, and AI/ML service integrations (Azure AI, OpenAI, Cognitive Services)
  • Build and consume RESTful APIs and event-driven services interacting with AI models
  • Contribute to system architecture, scalability, and AI-readiness
  • Write clean, maintainable, well-tested code following modern engineering and AI-safe practices
  • Lead code reviews, testing, documentation, and AI governance
  • Collaborate with cross-functional teams to translate business needs into technical and AI solutions
  • Optimize application performance, reliability, security, and AI workloads
  • Troubleshoot full-stack and cloud/AI integration issues
  • Mentor developers and upskill teams in AI-aware development
  • Stay current on .NET, cloud, and AI technologies, recommending improvements and innovations
Requirements
Backend & Architecture
  • 5+ years of experience in .NET development using C#, ASP.NET Core, and RESTful APIs.
  • Strong knowledge of software design principles, including architecture patterns, SOLID principles, and clean code practices.
  • Experience with SQL Server and relational databases.
  • Experience designing and developing scalable, modular applications and services.
  • Strong analytical, problem-solving, and communication skills.
Frontend Development
  • 3+ years of professional experience with React and TypeScript for building modern, scalable web applications.
  • Deep knowledge of JavaScript (ES6+), HTML5, and CSS3, including responsive design and modern layout techniques (Flexbox, Grid).
  • Experience designing modular, reusable React components and scalable frontend architecture.
  • Solid understanding of state management patterns (Redux Toolkit, Context API).
  • Experience integrating RESTful APIs and implementing authentication flows (e.g., JWT).
  • Familiarity with modern frontend build tools and package managers (npm/yarn, Vite/Webpack).
  • Understanding of React performance optimization techniques.
  • Knowledge of web security and accessibility best practices.
Cloud, AI & Integration
  • Experience with cloud platforms, preferably Microsoft Azure.
  • Experience integrating AI/ML capabilities into applications (e.g., Azure OpenAI, Cognitive Services, prompt engineering, AI-assisted automation).
  • Familiarity with AI/ML platforms and frameworks such as Azure ML, Semantic Kernel, LangChain, or ML.NET.
  • Understanding of AI security, data privacy, and responsible AI principles.
DevOps & Development Practices
  • Experience with CI/CD pipelines, DevOps practices, and Git workflows.
  • Experience working in agile development environments and cross-functional teams.
Nice to Have
  • Experience with Next.js.
  • Experience with component libraries such as Material UI or Ant Design.
  • Experience with end-to-end testing tools (Cypress or Playwright).
  • Familiarity with design systems and collaboration tools such as Figma.
  • Experience with microservices architecture.
  • Experience with containerization and orchestration (Docker, Kubernetes).
  • Experience building AI-driven products in product-led, innovation-focused environments.
  • Experience with frontend or full-stack frameworks such as Angular or Blazor.

About us
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Thank you for your interest in Flat Rock
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