Hiring AI engineers for building LLM multi-agent systems requires a focus on a unique blend of skills, including passion for AI, core engineering competence, advanced LLM-specific knowledge, and a tinkerer mindset. Candidates should not only be updated with the latest models and trends but also exhibit strong opinions and enthusiasm for AI. They need to demonstrate the ability to write clean, efficient code, manage data processing, and understand system architecture. Proficiency in advanced concepts like fine-tuning, RAG basics, and context engineering is essential, as is a hands-on experimental approach that embraces trial and error. Effective communication skills are crucial for problem-solving and prompt engineering, allowing candidates to break down complex tasks and structure prompts clearly. A practical take-home assignment can reveal their ability to build functional systems with thoughtful architecture. Overall, the selection process emphasizes how candidates think, learn, and execute in a rapidly evolving field, prioritizing those who can navigate ambiguity and deliver working AI solutions.