At 5Plus (part of Pentadoc Group), we build production-grade AI systems that solve real operational problems for our customers. As a Senior AI Engineer (m/f/d), you will take technical responsibility for customer-facing AI solutions — from early design decisions to production deployment and operation. You will design, build, and operate AI applications ranging from LLM-powered workflows (e.g., intelligent document processing, RAG systems) to agentic AI systems that are actively used in customer environments. German language skills at C1 level and above are mandatory for this role. You’ll work closely with customers and internal engineers to translate ambiguous requirements into reliable, scalable systems and guide AI-driven product development within customer projects. This role is hybrid, with predominantly remote work and occasional on-site presence at customer locations across Germany and our office in Würzburg, Bavaria. Your profile Several years (3–6) of hands-on experience building and operating AI/ML systems in real-world projects. Solid experience implementing agents on the LangChain stack (LangGraph, DeepAgents, LangFuse) in Python, including FastAPI interfaces/integrations (minimum of 3 agents per project) Basic knowledge of AWS (e.g. ECS, CDK, …) **Strong Python expertise (**app. 5 years) and experience with modern AI/LLM tooling; framework-agnostic mindset. Proven experience with LLM-based systems (e.g., RAG, embeddings, tool usage) and an understanding of trade-offs between quality, cost, latency, and complexity. Ability to work independently in customer-facing environments, taking ownership of technical decisions under uncertainty. Professional communication skills in customer contexts. Residence in Germany. Bonus points to score Deeper experience with agentic architectures (planning, memory, multi-agent coordination). Experience deploying and operating AI services in cloud environments (AWS, Azure, etc.). Contributions to open-source projects, tech