Middle+ SDE with MCP Experience

We are looking for an AI Engineer to join a product engineering team focused on introducing LLM-based capabilities into enterprise software and building systems such as MCP servers and agents. The role involves working on AI-driven product features, backend services, and integrations that connect models with tools and data in a scalable production environment. Location: Serbia (relocation support available), Croatia, Poland, Portugal Tasks Design and develop AI-powered product features with a focus on LLM-based capabilities; Build and maintain MCP servers and agent-based components; Develop enterprise-grade web services and backend integrations; Work with tools, data sources, and model interfaces across cloud environments; Collaborate with engineering teams to deliver production-ready AI solutions. Requirements CORE AI Engineer profile with strong SDE background; Proficiency in C# or Python; Knowledge of Model Context Protocol (MCP) for connecting tools and data into models; Experience in developing enterprise-grade web services; Experience working with cloud platforms such as Azure, AWS, or GCP. Nice to have Hands-on experience with LLM and RAG engineering, including retrieval design, chunking, vector stores, and structured outputs, using tools such as OpenAI, LangChain, or LlamaIndex; Experience in building and orchestrating agentic systems that call tools and reason over retrieved context, using frameworks such as LangGraph or AutoGen, and OpenAI tool calling or the Responses API; Familiarity with LLM evaluation and observability tools such as LangSmith or Langfuse; Experience with guardrails and security measures such as prompt injection defense and output validation. Engagement Type B2B contract. Location / Timezone Remote work from Croatia, Poland, Portugal, and Serbia. European working hours. Occasionally available for meetings up to 10:00 AM PST (US overlap).