Senior AI Engineer

Avenga is an international engineering firm helping businesses operate with AI at the core. With 6,000+ experts worldwide, we combine engineering expertise with AI-native thinking to turn ambitious ideas into real-world impact across industries, technologies, and markets. At the core of the role We are actively seeking a professional to strengthen our team in Bulgaria as an AI Software Engineer .

You will build and deploy production-grade LLM and agentic AI solutions, working with modern AI frameworks, model APIs, RAG, and cloud infrastructure while helping shape secure and scalable AI solutions for enterprise clients. Core skills you’ll bring 5+ years of professional software engineering with strong Python; C#/.NET is a plus. Clean, tested, reviewed code is your default.

Hands-on production experience with LLM applications: model APIs, tool calling, structured outputs, RAG, and at least one agent framework (for example LangGraph, Semantic Kernel, Microsoft Agent Framework or OpenAI Agents SDK). Experience running open-weight models, for example with vLLM, TGI or Ollama. A practical understanding of how LLM systems fail and how to design against it: hallucination, prompt injection, tool misuse, loops, cost blow-ups.

Spec-driven development as your normal way of working: specifications, interface contracts and acceptance criteria written before code; daily use of AI coding agents (for example GitHub Copilot, Claude Code or Cursor, with tools such as GitHub Spec Kit or Kiro); r