10 Real-World Use Cases Built by LLM Engineers in 2025" explores how AI specialists are implementing large language models to solve practical business challenges across industries. The article highlights innovative applications in healthcare diagnostics, multilingual customer service, financial document analysis, personalized education, supply chain optimization, legal document generation, content moderation, mental health support, customer journey optimization, and government services. Each use case includes specific data points showing measurable business impact, such as a 32% improvement in rare disease detection, 67% reduction in customer support costs, and 74% faster government service processing. The article demonstrates how LLM engineers combine technical expertise with domain knowledge to create AI systems that augment human capabilities rather than replacing them.