AI product engineering is transforming the software engineering landscape, involving a diverse blend of builders, experts, and operators.The modern AI-first teams are not restricted to traditional silos but focus on fast iteration and feedback.The article explores the journey of founding a modern tool, CaterlyAI, aimed at enhancing catering sales efficiency using AI.Founder's confidence in launching a AI app quickly stemmed from real-world problems and domain expertise.Industry expertise is crucial for startup success, emphasizing the importance of founders' domain knowledge.Evaluating ideas involves considering practical user alternatives if the tool disappeared, highlighting valuable concepts.Shipping a product is just the start; sustainable profitability and scalability are essential considerations.Running a profitable AI application involves understanding core business costs and managing expenses effectively.Engaging with users, sharing the development process, and building in public accelerates product growth and meets user needs.The role of AI Product Engineer combines problem definition, product shaping, and technical solution building.